2.1, Class 1 Karts Specific Regulations: Class 1 refers to Direct Drive Karts of a designed cubic capacity of 100cc.

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1 2.0, Formula A Pre 2000: 2.1, Class 1 Karts Specific Regulations: Class 1 refers to Direct Drive Karts of a designed cubic capacity of 100cc. 2.2, Class Structure: Formula A Pre 2000: Up to and including , Class Eligibility: The class that a kart will race is determined by whichever of these is the latest period. Chassis, Engine, Tyres, Exhaust manifold diameter and rear axle diameter. A chassis is dated from when it first proven to have been produced and raced, or when it was CIK homologated. Non-homologated chassis will be dealt with as they arise and there dates will be established by the owner or driver before race use. An engine is dated as when it first appeared in the RAC blue book or the CIK homologated book. Karts with an exhaust manifold diameter greater than 40mm must race in the classic class. Karts with a rear axle greater than on inch diameter must race in the classic class, (it may be possible that some vintage class karts have a rear axle greater than one-inch diameter, these are not affected by this rule.) It is the driver s responsibility to establish the age of his / hers kart and hence the class that it will race in and confirm with RetroRacer officials before being raced. The scrutineer will point our any eligibility issues that they identify to the kart owner/driver, but they are primarily checking the kart for safety and not eligibility. However, any eligibility issues the scrutineer does identify will be noted and if not addressed then raised with the class representative. Similarly, if a driver thinks a kart in their class has eligibility problems they should raise these issues with the class representative. The class representative should then discuss the issue with the kart owner with the aim of finding a solution acceptable to all drivers in the class. The aim of this initiative to arrive at a friendly and informed solution to issues of eligibility. 2.4, Class 1 Karts Technical Regulations: 2.5, Engine Capacity, Class 1: Maximum engine capacity is 106cc. this is to enable the use of engines that would otherwise require re-lining/scraping. We will be checking bore and stoke randomly thought the course of events. Maximum bore size of commonly used 100cc engines are as below; 2.6, Carburettors: Carburettors are to be in keeping with the age of the kart, e.g. if a cast type Tillotson was originally fitted, this is not to be replaced with a modern cnc machined version. Carburettors with a venture diameter larger than 24 mm are not permitted. Flat slide carburettors are not permitted. See class rules for specifics version Page 1

2 2.7, Bodywork: No karts are to have bodywork fitted, apart from period style Nassau panels. Unless originally fitted. 2.8, Tyres: Tyres will be checked for eligibility and condition at scrutineering. No more than one set of race slick tyres may be used per meeting. Tyres / wheels must be in keeping with the era of the kart mono or split-rim hubs may be used. If front Mono rims are used they must be fitted with integral bearings. Separate front hubs for mono rims are not permitted. 2.9, Front Stub Axles: NO CNC MANUFACTURED STUB AXLES. Must be in period and originally fitted to the kart. 2.10, Rear Axles: Rear axle material and size must be as originally fitted to the kart. 2.11, Weights: Weight is the total of karts plus driver as weighed at the end of the race. It includes clothing, helmet and fuel. Checking of weights will be the first three in each race plus three random. If you are found to be underweight you will be disqualified from the heat or final you have just taken part in. 2.12, Finger guards: Finger guards are required to pass scrutineering and should be used throughout the race meeting. 2.13, Seat Stays: Maximum 2 per side and seat washers must be fitted between the seat and stays. 2.14, Brakes: Brake systems, but must be in keeping with the age of the kart, and should be of the same type as originally fitted, e.g, either drum mechanical disc or hydraulic disc. Note, all karts should have a secondary brake cable fitted even if a brake rod is used. Dispensation may be given if its not practical to fit a second cable due to the original design of the kart. This will be checked at scrutineering. 2.15, Rev Counters: The only rev counter to be fitted is period only Michron & Alfano etc ARE NOT PERMITTED PRE , Transponders: To be used for racing is the AMB160 and to be fitted to the rear of the rear seat stay. 2.17, Fuel: Super unleaded fuel purchased from a highway fuel station. version Page 2

3 3.0, Engines: Engines must: Have their original as homologated external appearance, (with the exception of bent, broken or missing fins). This regulation includes subtly larger crank case reed housing areas of later than 1998 reed engines, and any other such variations. These are not permitted. - Be air-cooled. - Be homolgated no later than 1998 for the Pre 2000 classes - Have their original homologated stroke length - Have the original homologated connecting rod length - Have a capacity no larger than 106cc - Have static, analogue PVL, Selectra, Ital Sistem, Ducati or Motoplat ignition - Programmable / variable ignitions are not permitted - External section of reed valve pyramid must not be greater than 68mm in length A scrutineer can stipulate that a competitors ignition coil must be swapped for another ignition coil, identical in make and model, which will be provided by Formula A at any time during the meeting. Ignition coil spades/plugs must be easily removeable, not silicone / tied into position. No material is to be added to any part of the engine, internal or external. Liners No material is to be added to any part of the homologated liner. Material is allowed to be removed only. Liner must show evidence of originally being double spigot either side of the middle transfer port, with at least one of these spigots displaying a minimum of 5mm in length. The gap between spigots must also be no less than 10mm in length. Evidence of later style singular central spigot liners being put into 90 s engines is not allowed. Liner replacements are allowed, but only replaced with two spigot, 90 s style liners. Only 3 engines permitted to be used on race day. Engine numbers must be written on a scrutineering card. 3.1, Brakes: FRONT BRAKES ARE NOT PERMITTED Brakes are to be acting on rear axle only. Self- adjusting brakes are not permitted. Secondary brake cable is mandatory. This must run through the loop in the pedal and attach at the master cylinder lever arm. 3.2, Slick Tyres: Komet K1H race tyres Strictly 1 x set of each per meeting. 3.3, Wet Tyres: Komet K1W No limit on sets of wet tyres. version Page 3

4 3.4, Ignition Systems: DIGITAL OR PROGRAMMEABLE IGNITIONS ARE NOT PERMITTED, Including mechanical ignition indexers. Motoplat, PVL and Selletra or period ignitions. 3.5, Stub Axles / Steering: Maximum stub axle shaft diameter 17mm. Stub axles must be in the style and period of the chassis. Steering column safety locking ring is mandatory in all classes. Castor / camber kits are permitted in all classes, but must be in keeping with the karts age. 3.6, Rear Axles: The rear axle is to be of magnetic steel material. Pre 2000 classes axle diameter no larger 50mm 3.7, Rear Hubs: Rear hubs with an overall length (excluding wheel studs) of less than 60mm are not permitted to overhang the ends of the rear axle. 3.8, Wheel Rims: Modern style and material wheel rims are permitted. 3.9, Silencers / Exhausts / Airbox: Period style exhausts are compulsory. Exhaust end cans (bean cans) are compulsory and must be securely fitted. Period style (Pre 2000) airboxes are compulsory. Air boxes are to have a maximum of 2 intake holes in them, each hole measuring no more than 23mm diameter, and each intake trumpet must be a minimum of 80mm in length. The use of gauze on the inlet trumpet is permitted. 3.10, Carburettors: One carburettor per engine only (no duel carburettors) Single butterfly carburettor with a centre axle only (no slide carburettors) Maximum venture diameter of 24mm for a minimum distance of 2mm. All Ibea carburettors that are unstamped (no L2/L3 marking) must be presented to a scrutineer before they are allowed to be used in competition. A throttle return spring must be present at the accelerator pedal. Pre 95 and pre 2000 classes are permitted to run carburettors homologated up to 1999 (no carburettors homologated post 1999) 3.11, Chassis Regulations: Any chassis that is first homologated during the 1997 homologation period, or any other earlier homologation period is eligible. If it s not homologated chassis, it must be proven to be manufactured no later than There is no lower age limit to chassis permitted. For example: A competitor can race a 1989 chassis in the Pre 2000 class. Remanufactured / replica chassis are not permitted. version Page 4

5 Once a chassis has been deemed legal to race in Formula A and manufactured in the correct homologation period it will have to be RetroRacer Formula A chassis seal attached. Formula A rules state that a chassis that is as 1997 homologation, even if manufactured during the 2000 to 2002 homologation period, can be used in the Pre 2000 class. This is providing all other regulations are adhered to. CIK plastic rear bumper is not permitted to be used. Rear bumper can be either euro loop or full width. Chassis numbers must be written on scrutineering card. 3.12, Bodywork: Fully bodywork preferred, but not mandatory. CIK02 or earlier plastic bodywork style is permitted. Post 1999 bodywork and bumper fixing designs are not permitted. Karts must conform to bodywork dimensions (where applicable) 3.13, Rev counters and data logging equipment: Rev counters and data loggers are permitted up to , Kart Width: Maximum width of rear wheels/tyre, outside edge to outside edge =1400mm Maximum width of front wheels/tyre, outside edge to outside edge = 1220mm 3.15, Finger Guards: Finger guards and chain guards/strip for both reed and rotary engines are mandatory. 3.16, Scrutineering cards: Scrutineers cards will be issued to drivers upon signing on. Scrutineers cards must be fully completed and handed to the scrutineers upon their kart being scrutineered on race day. Scrutineer cards require the following information: Engine numbers Chassis number Tyre bar codes Drivers names Race number Any driver caught using equipment not logged on the handed in scrutineer card. Maybe disqualified from the heat or the final. 3.17, Weights: Inclusive of years to run at 152 kilos. 3.18, Number Plates and Numbers: Race numbers are to be Black on a Yellow background and to be displayed on all four sides of the kart. Novices White numbers Black background. version Page 5