2019 RULES REVISED 30APR2019 - TUXEDO PARK RACEWAY
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2019 Rules Revised 30Apr2019
Contents
1 General Information ............................................................................................................................. 4
1.1 Knowledge of Track Rules ............................................................................................................. 4
1.2 Code of Conduct............................................................................................................................ 4
1.3 MyRacePass .................................................................................................................................. 4
1.4 General Safety ............................................................................................................................... 4
1.4.1 Raceceiver ............................................................................................................................. 4
1.4.2 Fire extinguisher.................................................................................................................... 4
1.4.3 Open Flame ........................................................................................................................... 4
1.4.4 Motorized Vehicles in the pits .............................................................................................. 4
1.4.5 Racer Safety Equipment ........................................................................................................ 4
1.5 General Information ..................................................................................................................... 5
1.5.1 Pit Stall Reservation .............................................................................................................. 5
1.5.2 Rainout Information.............................................................................................................. 5
1.5.3 Proof of Age .......................................................................................................................... 5
1.6 Sanctioning.................................................................................................................................... 5
1.7 Entries that don’t meet class requirements ................................................................................. 5
1.8 Technical Infractions ..................................................................................................................... 6
1.9 Awards .......................................................................................................................................... 6
1.10 Fuel ................................................................................................................................................ 6
1.11 Race Format .................................................................................................................................. 6
1.11.1 Event Operations .................................................................................................................. 6
1.11.2 Race Operations .................................................................................................................... 6
1.12 Season Points ................................................................................................................................ 6
1.13 Fees ............................................................................................................................................... 7
1.14 Contact Information...................................................................................................................... 7
1.15 Claims ............................................................................................................................................ 7
2 Class Structure ...................................................................................................................................... 7
2.1 Cage Classes .................................................................................................................................. 8
2.1.1 Carlisle Tires .......................................................................................................................... 82.1.2 Engines .................................................................................................................................. 8
2.1.3 Chassis ................................................................................................................................... 8
2.2 Flat Classes .................................................................................................................................... 9
3 Class Specifics........................................................................................................................................ 9
3.1 Cage............................................................................................................................................... 9
3.1.1 Cage Beginner ....................................................................................................................... 9
3.1.2 Cage Amateur........................................................................................................................ 9
3.1.3 Cage Junior 1 ....................................................................................................................... 10
3.1.4 Cage Junior 2 ....................................................................................................................... 10
3.1.5 Cage Super Junior (Wazoom) .............................................................................................. 10
3.1.6 Cage Adult 206 .................................................................................................................... 10
3.2 Flat .............................................................................................................................................. 11
3.2.1 Flat Beginner ....................................................................................................................... 11
3.2.2 Flat Junior 1 ......................................................................................................................... 11
3.2.3 Flat Junior 2 ......................................................................................................................... 11
3.2.4 Flat Adult ............................................................................................................................. 12
3.2.5 Flat Predator Claimer .......................................................................................................... 12
3.2.6 Flat Limited Modified .......................................................................................................... 12
3.3 Flat Outlaw (Non Weekly Class) .................................................................................................. 13
4 Appendix ............................................................................................................................................. 13
4.1 Tire Pattern – Grooved Slicks ...................................................................................................... 13
4.2 Cage Kart Chassis Requirements................................................................................................. 151 General Information 1.1 Knowledge of Track Rules It is the responsibility of racers and team members to understand the rules at Tuxedo Park Raceway. Tuxedo Park Raceway uses rules from NKA, AKRA, Briggs & Stratton and IKF and knowledge of the rules of your class resides with the participant. It is a best practice to have copies of rules that are applicable to your class available at all times. It is possible that rules could change during the year. The team at Tuxedo Park Raceway will make every effort to notify those impacted by any changes. 1.2 Code of Conduct Racer/Parent is responsible for the conduct of individuals in their pit. The negative actions of an observer/helper could result in disciplinary action for the participant. 1.3 MyRacePass Tuxedo Park Raceway is a member of the MyRacePass network. Line ups, results, points and scoring for Tuxedo Park Raceway will be available on the MyRacePass Ap. 1.4 General Safety 1.4.1 Raceceiver Raceceivers will be required for all Junior participants. Tuxedo Park Raceway will not require Raceceivers in Adult classes, but we encourage that adult racers to use them. There will limited quantities available each week for $15 per night. Channel 454.000 will be used at Tuxedo Park Raceway. We strongly recommend that you purchase the Raceceiver brand and stay away from the Nitro Bee version. 1.4.2 Fire extinguisher Fire extinguishers are not required, but we encourage all participants to have an extinguisher in their pit. 1.4.3 Open Flame Tuxedo Park Raceway is sanctioned by NKA. Open flames are not allowed in the pits during NKA sanctioned events. There is no escalation structure for violation of this rule. Penalties will be determined by Tuxedo Park Raceway staff. 1.4.4 Motorized Vehicles in the pits Motorized vehicles are not allowed in the pits at any event. There are some circumstances were a push vehicle through the pits is necessary. Those requiring a push vehicle should first clear it with Tuxedo Park Raceway staff. Failure to comply with this rule could lead to disciplinary action. 1.4.5 Racer Safety Equipment All safety equipment must meet NKA standards as explained in their rules package.
All helmets must be closed faced. Hoodies are not allowed. Participants with long hair must have it tied and/or tucked inside uniform. Gloves must be worn at all times when participant is on the racing surface. 1.4.6 Lead Ballast Lead must be identified and secured in accordance with NKA requirements. 1.5 General Information 1.5.1 Pit Stall Reservation Pit stalls can be reserved for $40. This fee is good for the year and includes special events unless otherwise specified. Priority will be given to track/race/class sponsors of Tuxedo Park Raceway. Please contact Tuxedo Park Raceway if you are interested in reserving a pit spot. 1.5.2 Rainout Information If the decision has not been posted in any of the sources identified above, then it has not been made yet. 1.5.3 Proof of Age Tuxedo Park Raceway reserves the right to request proof of age of any driver at any time. Your age on December 31st 2019, determines your competition age for the entire year. Tuxedo Park Raceway recommends that you keep a copy of a minor racers birth certificate with them at all time. 1.6 Sanctioning 1.7 Entries that don’t meet class requirements In our area there is a wide variety of tire and engine combinations. Tuxedo Park Raceway does not want to turn away any racer, but we will also not make a habit of having small classes cannibalize each other. If Tuxedo Park Raceway believes that you race package is comparable to the offerings at the track, you may be required to race with that class. Performance of the kart compared to the standard offering will be used to determine where that kart will start in the feature. Karts that do not meet the requirements of Tuxedo Park Raceway’s current offerings are not eligible for track points or post-race awards. Example 1: If a Cage Junior 1 racer shows up with a Briggs 206, they will race with the Cage Junior 1 class. They will not be eligible for track points or post-race awards. Example 2: If a Cage Adult 206 racer shows up with Hoosier tires, they will race with the Cage Adult 206 (Carlisle Tires). They will not be eligible for track points or post-race awards. Example 3: If a Flat Junior 2 racer shows up with a Predator engine, they will race with the Flat Junior 2 (Clone). They must have a restrictor that matches the requirements of the class. In the case of a Briggs 206, the slide/opening must be appropriate for the class. They will not be eligible for track points or post-race awards.
1.8 Technical Infractions Any racer that fails technical inspection during a heat will be scored in last place for their heat. They will be scored behind DNS and DNF entries for the heat. Any racer that fails technical inspection following a feature will score zero(0) points for the event. Any junior racer that is missing a restrictor or has an altered restrictor will be subject to suspension. This is a safety issue and there will be zero tolerance for restrictor related issues. 1.9 Awards This is what we will do… There will be no post race awards in any unsponsored, non regular with less than 5 participants. All racers that participate in 75% of the all “Points” events will be eligible for post season awards. 1.10 Fuel Jay’s Oil & Propane at 237 West 13th in Crete, NE (Regular 87 – Non Ethanol) will be used as the fuel standard for all events unless otherwise specified. Verification before the event will be available pre race. 1.11 Race Format 1.11.1 Event Operations Unless otherwise specified, pits will open at 4:00 PM. Drawing a registration will close at 6:00 PM. Races will start at 7. Any participant that is late to registration may have the opportunity to start last in their heat races. 1.11.2 Race Operations Tuxedo Park Raceway will utilize the two(2) heat and feature format. Heat starting position will be determined by registration draw (Low to front). Feature starting position will be determined by finishing average in the heat races. Racers with the lowest combined average finishing position in the heat races will start at the front of the feature. Ties will be broken by registration draw. Tuxedo Park Raceway will use this format for all events unless otherwise specified. It is the racer’s responsibility to be prepared to race at time/order required. Tuxedo Park Raceway will make attempts to announce order, but the ultimate responsibility resides with racer/team. 1.11.3 Race Distances Beginner Classes: Heats – 6 Laps, Feature – 12 Laps Amateur & JR Classes: Heats – 8 Laps, Feature – 15 Laps Adult Classes: Heats – 10 Laps, Feature – 18 Laps 1.12 Season Points Points will be scored at each race throughout the season. There may be events during the season that are not a part of the points season. Those races will be identified as “No Points” on the schedule.
Tuxedo Park Raceway will only maintain points for the classes that are listed in the “Class Structure” section. Tuxedo Park Raceway is open to adding weekly classes, but it is best that participants communicate their expectations if their class is not available. Tuxedo Park Raceway uses the NKA scoring system. Please visit NKAonline.com (Section 10.5.19 in 2018 Manual). Exception, Tuxedo Park raceway will not use the total kart bonus in the NKA system. 1.13 Fees Pit Stall Reservation (Optional): $40 Registration Fee: $30. This fee will be once per year for each class that you participate in. All registration funds will be towards end of season awards. There is no registration fee for special events. Racer Pass: $25. It is $15 for each additional class. Pit Pass: $10 Spectator Area: Free It is important to understand that it is a requirement that anyone person in our pit area has a pit pass. NKA does not recognize the “hot/cold” pit process. Individuals without proper insurance in the pit area puts the entire program in jeopardy. Anyone within the pit area that does not have a pit pass faces possible disciplinary action not only for themselves, but racer/team they are with. 1.14 Contact Information Phone: 402-871-3423 Email: nick.a.dice@gmail.com Facebook: Tuxedo Park Raceway Website: racetuxedo.com 1.15 Claims The purpose of a claim is to keep cost of selected classes to a minimum. Only racers in the class can claim others in the class. Tuxedo Park Raceway is also eligible to claim. Tuxedo Park Raceway has the right to refuse any claim for any reason. Racers that refuse claim lose any points and/or awards that would have been scored in the feature. There are no further penalties for claim refusal. 2 Class Structure Tuxedo Park Raceway will make every effort to not turn away any racers, but it is up to participants to communicate with Tuxedo Park Raceway prior to coming to the facility if their class is not listed.
2.1 Cage Classes Cage Beginner, Cage Amateur, Cage Junior 1, Cage Junior 2, Cage Super Junior (Wazoom), Cage Adult 206 2.1.1 Carlisle Tires Classes that are required to run the Carlisle tire must have two(2) Turf Master (13X6.5X6) and two(2) Turf Saver (13X5X6). The Turf Master max wheel width is 7” and the Turf Saver max wheel width is 6”. The width is measured as it is by the manufacturer, inside to inside. 2.1.2 Data Acquisition Data Acquisition devices are only allowed in the Cage Super Junior and Cage Adult 206 class. If a racer chooses to use device is practice, it must not be placed anywhere where it can be seen by the driver. It must be removed from the kart during competition. 2.1.3 Engines 2.1.3.1 Clone Engine - Cage Tuxedo Park Raceway will run RaceSaver Clone rules as outlined in Appendix. Exceptions: Tuxedo Park Raceway will honor Racesaver Seals, but they will not be required for participation. Tuxedo Park Raceway will not have a claim in these classes. These exceptions will be evaluated throughout the season and may change at some point during the season. FUEL: See Fuel Section When possible Tuxedo Park Raceway will honor seals placed on engines by other tracks. It is important to keep in mind that this may not always be the case. Seals are not required for participation at Tuxedo Park Raceway. 2.1.3.2 Clone Engine Flat Engine must meet specifications set forth by NKA for Clone classes FUEL: See FUEL Section 2.1.3.3 Briggs & Stratton 206 Engine must meet specifications set forth by Briggs and Stratton (www.briggsracing.com). The only exception to these rules are the spark plug and air filter. FUEL: See FUEL Section 2.1.3.4 Briggs & Stratton Blue Wazoom (Uncle Frank’s Racing) Engine must meet specifications set forth by IKF (Section 720 in 2018 Manual) FUEL: Methanol 2.1.4 Chassis Only chassis that comply with Section 20.4 (2018 NKA Manual) are legal for participation at Tuxedo Park Raceway. Junior champ/cage chassis are not eligible.
2.2 Flat Classes Flat Beginner, Flat Junior 1, Flat Junior 2, Flat Adult, Flat Predator, Flat Limited Modified 3 Class Specifics 3.1 Cage 3.1.1 Cage Beginner The Beginner class is for those racers that have never raced or do not meet the age requirements of higher classes. The purpose of this class is for racers to build confidence and learn along side others in their class. This class is a participation class. Awards will be given to all participants, but there will be no finishing order in this class. Awards may vary based upon kart count. No points will be kept in this class, but racers are eligible for post season awards. If Tuxedo Park Raceway staff believes that a racer processes the skills necessary to move to a higher level, a racer may be required to move up. Racer must meet age requirements of higher class. Races will start at the flag stand via standing start. AGE: 5-8 Years (No Experience) WEIGHT: No Minimum Weight CLUTCH: 12 tooth #35 drum clutch. No Roller Bearing Clutches allowed TIRES/WHEELS: See Carlisle Tires above RESTRICTOR: ARC .375 - RED 3.1.2 Cage Amateur The Amateur class is for racers that do not believe they are ready for the Junior 1 class. The purpose of this class is for racers to build confidence and learn alongside others in their class. Because racers in class meet the requirement of Junior 1 but a decision has been made for them not to participate, this class is a participation class. Awards will be given to all participants, but there will be no finishing order in this class. Awards may vary based upon kart count. No points will be kept in this class, but racers are eligible for post season awards. If Tuxedo Park Raceway staff believes that a racer processes the skills necessary to move to a higher level, a racer may be required to move up. Racer must meet age requirements of higher class. AGE: 6-9 Years WEIGHT: 280lb Minimum CLUTCH: 12 tooth #35 drum clutch. No Roller Bearing Clutches allowed TIRES/WHEELS: See Carlisle Tires above
RESTRICTOR: ARC .375 - RED
3.1.3 Cage Junior 1
AGE: 7-11 Years
WEIGHT: 310lb Minimum
CLUTCH: 12 tooth #35 drum clutch. No Roller Bearing Clutches allowed
TIRES/WHEELS: See Carlisle Tires above
RESTRICTOR: ARC .425 - Green
3.1.4 Cage Junior 2
AGE: 12-15 Years
WEIGHT: 350lb Minimum
CLUTCH: 12 tooth #35 drum clutch. No Roller Bearing Clutches allowed
TIRES/WHEELS: See Carlisle Tires above
RESTRICTOR: ARC .500 - Purple
3.1.5 Cage Super Junior (Wazoom)
AGE: 10-14 Years
WEIGHT: 360lb Minimum
CLUTCH: Open
FUEL: Methanol
TIRES/WHEELS:
• LEFT FRONT, LEFT REAR and RIGHT FRONT: Hoosier 11920 (D30 – 11.0X6.5-6). Rim must have a
width of 6”-8.5”
• RIGHT REAR: Hoosier 11950 (D30 – 11.5X9.0-6). Rim must have a width of 10”.
ENGINE RULES: 2018 IKF Rules. Sections 720.1 - 720.17
RESTRICTOR: None
3.1.6 Cage Adult 206
AGE: 16+ Years (Racers under 16 may be considered with Tuxedo Park Raceway Approval)
WEIGHT: 400lb MinimumCLUTCH: 12 tooth #35 drum clutch. No Roller Bearing Clutches allowed TIRES/WHEELS: See Carlisle Tires above RESTRICTOR: NONE 3.2 Flat 3.2.1 Flat Beginner The Beginner class is for those racers that have never raced or do not meet the age requirements of higher classes. The purpose of this class is for racers to build confidence and learn along side others in their class. This class is a participation class. Awards will be given to all participants, but there will be no finishing order in this class. No points will be kept in this class, but racers are eligible for post season awards. If Tuxedo Park Raceway staff believes that a racer processes the skills necessary to move to a higher level, a racer may be required to move up. Racer must meet age requirements of higher class. AGE: 5-8 Years WEIGHT: No Weight ENGINE: Clone per NKA specs, Weenie Pipe Required RESTRICTOR: ARC .375 – Red. Required no matter what engine racer runs. NOTE: Any data acquisition devices must be placed where it can not be seen by the driver. 3.2.2 Flat Junior 1 AGE: 7-11 Years WEIGHT: 265lb Minimum ENGINE: Clone per NKA specs, Weenie Pipe Required RESTRICTOR: ARC .425 – Green. Required no matter what engine racer runs. 3.2.3 Flat Junior 2 AGE: 12-15 Years WEIGHT: 315lb Minimum ENGINE: Clone per NKA specs, Weenie Pipe Required RESTRICTOR: ARC .550 – Blue. Required no matter what engine racer runs.
3.2.4 Flat Adult AGE: 16+ Years (Racers under 16 may be considered with Tuxedo Park Raceway Approval) WEIGHT: 370lb Minimum ENGINE: Clone per NKA specs RESTRICTOR: NONE 3.2.5 Flat Predator Claimer AGE: 14+ Years WEIGHT: 350lb Minimum. TPR House karts that are not running for points do not have to scale. ENGINE: Harbor Freight 6.5 HP 212cc. Gas cap can be vented. ENGINE SPECS: Engine must have stock intake, exhaust and tank. Engines that do not meet this requirement may be allowed to participate, but will not be scored. Valve Spring Installed Height Minimum .815 Maximum Spring Tension of 10.8 at a Height of .850 Max Wire Diameter Of .071 Chain Guard height must be higher than the stock muffler as to protect the driver for accidental contact. Suggest using ARC-1420. PVL Flywheels are allowed. When in use they are not subject to claim. CLUTCH: Drum clutch. Driver size is open. TIRES: See Appendix for example and rules. RESTRICTOR: NONE CLAIM: Engine claim $130 (No chain guard, throttle assembly or clutch). POINTS: Claimer must have participated in 75% of races to date. Claimer can only claim a racer once per year and can not make more than 2 claims for the year. NOTE: Data Acquisition (Tach/Temp/Lap Time) will not be allowed in this class. Participants that are racing Tuxedo Park Raceway karts and elect to not pay race fee will not be scored or awards. 3.2.6 Flat Limited Modified AGE: 14+ Years WEIGHT: 350lb Minimum
ENGINE: Predator, Ducar Clone and Briggs and Stratton Animal (Gen 1-5), Honda GX200 Blocks only. ENGINE SPECS: No Billet Blocks or heads. Billet side covers are acceptable. Briggs Model 15 blocks are not acceptable. Block Supports/Girdles are acceptable. No 2 Cycle engines. CLUTCH: Open TIRES: See Appendix for example and rules. NOTE: We will not start 2019 with a claim. There will always be someone that will work within the rules to get the most out of their motor. It is a good idea to keep a $ figure of $1750 - $2000 for engine. The purpose of this class is reasonable horsepower that is affordable. If you are thinking of spending at or above this to race this class, you are spending too much. The class will collapse if the cost of engines gets out of hand. We will watch closely and it is possible that rules could be modified during the season. There will be discussion with participants before any changes are made. 3.3 Flat Outlaw (Non Weekly Class) AGE: 14+ Years WEIGHT: No Minimum ENGINE: Open CLUTCH: Open TIRES: Open NOTE: Outlaws will not be run on weekly basis. Outlaw races will be published on schedule. Outlaws that show up on non scheduled dates will race with Limited Modified class, but they will not score points in the feature or be eligible for awards. 4 Appendix 4.1 Tire Rules – Limited Mod & Predator Claimer 4.1.1 Rules Treaded Hoosiers, Burris or Maxxis Slicks with one 1” square grooves. An unaltered slick can be run on the left front. Squares must be between .75” – 1.5” when measured from groove to groove. Tires that measure 8”-9” across must have 6-8 columns. Tires measuring 6”- 7” across must have 4-6 colums. Tread Depth must be atleast 1/16” on grooved slicks (To be checked before race). Tread Depth will not be measured on manufactured treaded tires. No 2019 Date code grooved slicks.
4.1.2 Pattern – Grooved Slicks
4.2 Cage Kart Chassis Requirements
4.3 Cage Kart Engine Requirements Engine Description: Single Cylinder, 2 valve, and OHV 4 cycle (Box Stock Project) or Clone. Combustion Chamber Volume: 26.5 cubic centimeter minimum, with piston at TDC, using prescribed procedure. The liquid CC check is the official check (If the engine fails the CC Liquid check at anytime during the tech procedure it must be called illegal.) Cylinder Head Requirements: Must be OEM casting only. All cylinder heads used must be the “JT” 4 bolt valve cover cylinder head (168-f 6.5hp GX 200 series) or the TG-1 head only. Porting and/or grinding are not permitted. Exhaust Port Pours should check 22.5cc minimum-22.8cc Maximum, Intake Port Pours 27cc should check minimum-27.5cc maximum. Valve seats may have up to three angles, 45 degrees valve face and 30 degrees top relief and 60 degree bottom relief. Cutting of the valve seats allowed to insure proper seal. Intake seat maximum ID .899”, Exhaust seat maximum ID .862”. Outside face of valve may not be elbow floor of combustion chamber (i.e. don’t sink the valves.) Stock head bolts only, must have four. Head gasket/s may be after market, must be of stock configuration, gasket thickness is a non tech item, sealer allowed to insure proper seal. Depth check between the valves, front to back and side to side may not vary by more than .005 max. No copper or aluminum gaskets allowed. Any stock configuration exhaust gasket allowed, sealer permitted, header may also be run without gasket, sealer only. Allen head bolts permitted on Header to head. The use of aftermarket flanged bolts of similar OEM design (Head Size, Diameter, Length, and Thread length/pitch) allowed as replacement for stock head bolts. No studs allowed. No additional washers allowed. Breather hole on valve cover may be tapped with 1/4” pipe tap to accommodate breather fittings. No over sized drilling allowed. Block Requirements: Stock cylinder bore is 2.67” may be bored to 2.691” maximum. Stroke is 2.123” + .010” or - .010”. No Piston pop out allowed. Matting surface finish of block and cylinder head is a non- tech item, surfacing of both to correct gasket failure and meet cc check allowed however, no piston pop out is allowed. May use 2 side cover gaskets of stock configuration. Block must remain stock as produced. Stub for governor may be removed and hole plugged. No machining of block allowed. Welding to the block shall be for rod damage repair only and may not constitute a functional modification. (Oil drain hole between lifters .250” Max. Any type side cover fastener and lock washer permitted, must be original size, sealer permitted.) Solid dowel pin replacement for the side cover to block .317 maximum diameter allowed (Factory stock dowel pin is 8mm or .315). Dowel pin must remain in the factory position. Carburetor requirements: Huayi or RUIXING model carb only. Carb to intake sealer is gasket only, no other sealer allowed. Choke must be as supplied from factory, but may be fixed to stay in open position. (Choke area must remain as cast). Venturi .615” NO-GO. Venturi may be machined to spec, Minimum Venturi size is .608, no polishing permitted and all transitions must remain stock in and out of venturi. Rear carb bore .751” NO-GO. Carb bore at rear of carb .750” maximum depth (This measurement is taken from the flat surface on the rear of the carb down to the circular ridge at venturi edge). Main fuel jet .042” NO-GO. No use of locktite or other materials on high speed jets or damaged threads permitted in an attempt to lock jet in a non stick location. Main jet must seat firmly on bottom of E-Tube,. Low speed idle jet is a non tech item. Stock emulsion tube must be used and unaltered, .066’ max ID (NO- GO). Side holes in E-tube 4 holes in bottom section max and must have 20 holes in middle section.
Minimum E-Tube length 1.092”. The minimum protrusion of the E-tube into the Venturi must be check by the newly approved NO-GO gauge Huayi .488” or Ruixing .479”. Minimum outside diameter of the E- tube at any point is .154”. Side holes in e-tube diameter .036” NO-GO. Throttle shaft - .115” minimum. Stop arm of throttle shaft maybe filed to adjust for butterfly position. Butterfly - .037” minimum thickness. Butterfly screw minimum length .305”:, screw must remain stock as produced with no alteration allowed to achieve minimum length. Air Filter adapter should be part #6931ARC. Air Filter should be 4” tall angled or straight for Box Stock Project Clone. Phenolic spacer must be flat across entire gasket mating surface, with a minimum thickness on gasket surface of .265” (not including gasket). Gasket surfaces must remain parallel. No angle cutting allowed. Center inlet hole is Non-tech (size, configuration, finish), but no rifling, grooving, dimpling, etc. allowed. Maximum mounting hole/s size .300” NO-GO (checked with .300” pin gauge)”. Phenolic spacer/gasket/s subject to spray test to check for leakage or introduction of air into intake track. Valve Train: Stock four bolt valve cover only with any stock configuration gasket, sealer allowed. Factory stock rocker arms 1:1 ratio and push rods only. Minimum overall length of rocker arm 2.145” minimum thickness of the upper valve stem ONLY, non tech, to adjust for proper running lift. Square tipped rockers allowed. Stock steel/stainless nitrate coated valves only 45 degree angle only both valves with a minimum weight of 21 grams each valve. Stock valves only 45 degree angle only both valves, intake valve Max OD .982” +/- .005” and exhaust valve max OD .945” +/- .005”, no modifications allowed. Single valve springs only. (Installed height for valve springs .815”, must be checked by using the .815” spring must go gauge with retainer seal and shims in place on intake an exhaust valve if used.) Shims may be used to achieve .815” installed height, maximum thickness of shims used .075”, any combination of valve seal and spring shims allowed. The ruling on the .075 shim thickness includes the oil seal if used. The valve stem seal has no tech other than it’s thickness combined into the max of .075 to obtain a minimum of .815 installed spring height. In other words, the valve stem seal can be used or not used and is no longer a tech item unless used as a shim. Also, the rubber inside it is a non tech item. Prescribed check procedure as follows- Remove valve spring, reinstall spring retainer and shims, insert .815” must go gauge in spring location. Gauge must go in both locations intake and exhaust with any allowed retainers and shims in place, as raced, during check procedure. Max wire diameter on spring wire is .071” with a maximum tension of 10.8 lbs. at a height of .850” and a maximum tension of 18 lbs at .650”. Prescribed procedure for using weight checker is as follows. Spring must slide over post on it’s own to the bottom. When weight is placed gently on the spring, push weight down onto spacer so that it bottoms out. Release weight and shine a flashlight between weight and spacer. Light must be visible in is entirety of 360 degrees to disqualify spring. Add (Additional check for valve springs – Each spring is to be checked using a .750” height by 800” width plate gauge and a .250” (square) no-go gauge to check the center spacing of the spring coils while inserted in the plate gauge. Prescribed check procedure as follows – Insert the spring in the .750” x .800” plate gauge (spring must be centered in plate gauge and must fit inside of gauge with the ends of the spring wires perpendicular to the plate). Once inserted in the plate gauge take the .250” no-go gauge and check the center coil spacing on both sides. The .250” no-go gauge must be parallel to the spring wire and perpendicular to the center of the spring when checking. The .250” no-go must pass check on at least one side of the spring. This check is to be performed after the 10.8 lb, 18 lb, check, and .071” max wire diameter check. Lash cap on exhaust valve only. Valve stem seal allowed on intake and exhaust valve. BS lifters only, no modifications allowed. Over-all length of push rod 5.285” max, 5.230” min. Push rod must be of 3 piece design (Hollow or solid
tube with 2 solid ball ends). Lifter head diameter .915” min with no visible modifications. Weight check lifters 18 grams min and push rods 9 grams min. Piston & Rings: Piston must be unaltered Box stock only. Overall piston length 1.935” max, 1.920” min and from top of wrist pin to top of piston .580” max. Arrow on top of piston must be pointed toward valves/lifters. Overall length wrist pin 2.100” min, inside diameter .550” max. Top ring and middle ring .115” max width, .060” max thickness. Filing of ring end gaps permitted including oil expander, max end gap .040” (top 2 rings only). Lapping of rings permitted for proper seal. Piston ring must be in one piece (unbroken) when presented for tech. Piston rings must be self supporting in cylinder bore when checked installed on piston with connecting rod attached (rod cap and bolts installed are not required for this check). Minimum weight of piston is 145 grams (must conform to this spec by 4/15/15). Honing of wrist pin journals permitted. Bore surface must remain flat and retain stock configuration edges. Skirt of piston must remain as produced. No chamfering, radiusing or breaking of edges permitted. Up to .010” over pistons allowed. Connecting Rod: Stock Box Stock rod only. Stock rod bolts only. Length of from top of journal to bottom of wrist pin hole 2.375” max and 2.350” min. Honing of journal end and wrist pin hole permitted, those surfaces must remain flat. Oil hole size .179” max, .0180” no go. Minimum weight of rod assembly 133 grams. New stock performance CAST rod allowed. Crankshaft Requirements: Stock Box Stock crankshaft required. Machining, polishing, addition of material or other alteration of crankshaft is prohibited. Stock factory timing gear mandatory and must be installed in original location. Crankshaft journal diameter is 1.180” max-1.168” min. Stock Crank bearings only. NO ceramic bearings allowed. Camshaft Requirements: Stock camshaft cores only, ez-spin assy must remain as stock. Cam lobe base circle diameter .865”-.005”/+.10” Duration check for intake and exhaust lobes (taken off pushrod). Intake duration of 219 degrees at .050” lift/97 degrees at .200” lift. All checks will allow +2.-5 (minimum duration checks effective 03-1-2016) degrees for wear and gauge variances, Max intake lift on cam .225” -Min .215” lift taken at the pushrod. Max intake lift at the valve .238” taken on valve spring retainer as raced. Max Exhaust Lift at the valve .242” taken on the valve spring retainer as raced. Running lift should be checked in front of the rocker arm on the valve retainer. Preloading dial indicator not required for this check, check lift as run. Competitor/Tech may rotate the retainer 2 times max to achieve proper running lift. Once dial indicator has been set to zero dial indicator must not be reset until check has been verified. Blower Housing Assembly: Pull Starter must be present and remain stock. Pull starter may be rotated for a better crank angle. Color and finish of blower housing, valve cover and all sheet metal is a non tech item. Header Requirements: DJ1137 RLV SuperBox Header Only. Fuel Tank Requirements: Floor Mounted fuel tank mandatory (stock tank must be removed). Pulse type fuel pump allowed.
5 Revision History Date Change 30Apr2019 Added Race Distances 29Apr2019 Fuel standard is Jay’s Oil 29Apr2019 Predator Claimer chain guard must be at least level with stock exhaust 27Mar2019 Removed Cage Adult Super from classes 27Mar2019 Changed Flat JR2 Restrictor to .550 Blue 27Mar2019 Changed fuel to “Regular 87 – No Ethanol” 27Mar2019 Changed Flat JR2 weight minimum to 315
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