2020 MCRCB Yearbook 5.5 MCRCB JUNIOR SUPERSPORT TECHNICAL REGULATIONS The following rules are intended to permit limited changes to the homologated motorcycle in the interests of safety and improved competition between various motorcycle concepts. EVERYTHING THAT IS NOT AUTHORISED AND PRESCRIBED IN THESE REGULATIONS IS STRICTLY FORBIDDEN. Junior Supersport motorcycles require an FIM homologation or MCRCB approval See www.fim-live.com for FIM Homologation procedure for Superstock, Supersport and Superbike motorcycles. All machines must be normally aspirated. All motorcycles must comply in every respect with all the requirements for road racing as specified in the MCRCB these Technical Regulations (G), unless they are already equipped as such on the homologated model. Once a motorcycle has obtained the homologation, it may be used for racing in the corresponding class for a maximum period of 8 years (see Homologation art). Or until such time that the homologated motorcycle is disqualified by new rules or changes in the technical specifications of the corresponding class. The appearance from the front, rear and the profile of Junior Supersport motorcycles must (except when otherwise stated) conform to the homologated SUPERSPORT shape (as originally produced by the manufacturer). The appearance of the exhaust system is excluded from this rule. 5.5.1 Motorcycle specifications All parts and systems not specifically mentioned in the following articles JUNIOR must remain as originally produced by the manufacturer for the homologated motorcycle. Where there is no individual tolerance indicated by a manufacturer in a machines homologated specifications for linear and angular dimensions and the manufacturer has stated the use of ISO 2768 tolerances or not stated any tolerance of any kind, then the only tolerance table from ISO 2768 that the MCRCB/MSVR will recognise for tolerance purposes is ISO 2768 – f (fine). TECHNICAL – 5.5.2 Eligible Machines The class will be based around the machines sold in Europe as A2 class machines and excluding the A1 class machines. The MCRCB has the right to decide which machines will eligible in the class. The following will be legal (this list can be amended at any time by the MCRCB): - Honda CBR500R - Kawasaki Ninja 300 (EX300ADF) - Kawasaki Ninja 400 (EX400) - KTM RC390 - KTM RC390R 195 JSS 2020 MCRCB Yearbook - Yamaha YZF-R3 5.5.3 Balancing various motorcycle concepts The MCRCB reserve the right to applying balancing to the machines in the class as they see fit in order to maintain equality amongst the models, in principle this will follow the FIM World Supersport 300 Championship regulations, but at all times the determination of the MCRCB will prevail. Methods may include but are not limited to the following: - Rev Limit - Weight limit change - Approved parts, see relevant MCRCB Bulletin The decision to apply the handicap will be taken by the MCRCB at any time deemed necessary to ensure fair competition. Balancing parts and modifications will be documented and published by the MCRCB and supersede all following regulations 5.5.4 Minimum weight The minimum weight for each model and combined rider/machine weights are as follows: Machine Machine Combined minimum rider/machine minimum Honda CBR500R 153Kg 203Kg Kawasaki Ninja 300 (EX300ADF) 140Kg 190Kg Kawasaki Ninja 400 145Kg 195Kg Yamaha YZF-R3 140Kg 190Kg KTM RC390 136Kg 186Kg The combined rider/machine weight is defined as the machine with the fuel tank and rider dressed as to race, including helmet. There is no tolerance on the minimum weight of the motorcycle. During the final technical inspection at the end of the race, the selected motorcycles with rider will be weighed in the condition they finished the race, and the combined weight limit must be met in this condition. Nothing may be added to the motorcycle. This includes all fluids. During the practice and qualifying sessions, riders may be asked to submit their motorcycle for combined weight control. In all cases the rider must comply with this request. 196 JSS 2020 MCRCB Yearbook The use of ballast is allowed to stay over the minimum weight limit and may be required due to the handicap system. The use of must be declared to the Chief Technical Officer at the preliminary checks. 5.5.5 Numbers and number plates See MCRCB General Technical Regulations (G-3.29). In case of a dispute concerning the legibility of numbers, the decision of the MCRCB will be final. Front: the colours are: Manufacturer: Number/Figure Background Honda White Red Kawasaki White Green Yamaha White Blue KTM White Orange Side: Any colour background with a contrasting colour number that is clearly defined from the background and complies with G-3.29.3. To help identification the numbers they should be surrounded by a single black line of at least 5mm thickness. 5.5.6 Fuel The MCRCB Control Fuel must be used in every practice session and race. This is supplied by Panta, see F-Championship Conditions and any Bulletins issued by MSVR. 5.5.7 Tyres All tyres must be provided by the official tyre supplier. The MCRCB will impose a controlled tyre. Further conditions will be stated in F - Championship Conditions and any Bulletins issued by MSVR. The use of tyre warmers is allowed. Any modification (cutting, grooving) is forbidden. 5.5.8 Engine Machines will be randomly chosen for dyno testing. 5.5.8.1 Fuel injection system a. The original homologated fuel injection system must be used without any modification. b. The fuel injectors must be stock and unaltered from the original specification and manufacture. c. Air Funnels must remain as originally produced by the manufacturer for the homologated motorcycle. d. Butterfly valves cannot be changed or modified. e. Secondary throttle valves plates may be removed or fixed in the open position and the electronics may be disconnected or removed. The secondary throttle shaft(s) must remain in place. f. All the parts of the variable intake tract device must remain and operate exactly as homologated. They cannot be added if not fitted to the 197 JSS 2020 MCRCB Yearbook homologated machine. g. Air and air/fuel mixture must go to the combustion chamber exclusively through the throttle bodies. h. Electronically controlled throttle valves, known as ‘ride-by-wire’, may only be used if the homologated model is equipped with the same system. Software may not be modified and all the safety systems and procedures designed by the original manufacturer must be maintained. 5.5.8.2 Cylinder Head a. Must be the originally fitted and homologated part with no modification allowed. b. The exhaust air bleed system must be blocked and the external fittings on the cam cover(s) may be replaced by plates. c. Valve spring shims may be changed freely. d. Head and base gasket is free. e. A restrictor may be required to be fitted between the cylinder head and inlet manifold. It will be a flat plate. No blending or filling will be allowed with sealant or otherwise. See MSVR approved parts list. f. The minimum squish clearance by machine will be listed in MCRCB Bulletin. 5.5.8.3 Camshaft Assembly a. Must be the originally fitted and homologated part with no modification allowed. b. At the technical checks: for direct cam drive systems, the cam lobe lift is measured; for non direct cam drive systems (i.e. with rocker arms), the valve lift is measured. 5.5.8.4 Cam sprockets or gears a. Cam sprockets may be slotted to allow the adjustment of cam timing. b. Pressed on cam sprockets may be replaced with an adjustable boss and cam sprocket. c. The cam chain and tensioner must remain as homologated. 5.5.8.5 Cylinders Must be the originally fitted and homologated part with no modification allowed. 5.5.8.7 Pistons Must be the originally fitted and homologated part with no modification allowed. 5.5.8.8 Piston rings Must be the originally fitted and homologated part with no modification allowed. 198 JSS 2020 MCRCB Yearbook 5.5.8.8 Piston pins and clips Must be the originally fitted and homologated part with no modification allowed. 5.5.8.9 Connecting rods Must be the originally fitted and homologated part with no modification allowed. 5.5.8.10 Crankshaft Must be the originally fitted and homologated part with no modification allowed. 5.5.8.11Crankcase / Gearbox housing Must be the originally fitted and homologated parts with no modification allowed. 5.5.8.11.1Lateral covers and protection a. Lateral (side) covers may be altered, modified or replaced. If altered or modified, the cover must have at least the same resistance to impact as the original one. If replaced, the cover must be made in material of same or higher specific weight and the total weight of the cover must not be less than the original one. b. All lateral covers/engine cases containing oil and which could be in contact with the ground during a crash, must be protected by a second cover made from metal, such as aluminium alloy, stainless steel, steel or titanium, composite covers are not permitted. c. The secondary cover must cover a minimum of 1/3 of the original cover. It must have no sharp edges to damage the track surface. d. Plates or crash bars made from aluminium or steel also are permitted in addition to these covers. All of these devices must be designed to be resistant against sudden shocks, abrasions and crash damage. e. MCRCB approved covers will be permitted without regard of the material or its dimensions. f. These covers must be fixed properly and securely with a minimum of three (3) case cover screws that also mount the original covers/engine cases to the crankcases.