MiniTwins Championship Regulations 2018 (cont.)

8 Wiring Harness and Battery

8.1 The wiring harness may be altered or replaced. Additional wiring may be added where required.

8.2 No wiring or electronic equipment may be added or modified to alter the ignition or engine timing characteristics from those of the homologated machine with the exception of the following:

8.2.1 The use of flash memory (flash RAM) for fuel injection mapping is allowed where the capability exists within the homologated motorcycle. An additional control unit to change the fuel mixture may be installed and must be fitted to the original connectors. The unit must not be able to perform any other function.

8.2.2 The side stand switch, and related wiring, may be disabled or removed.

8.2.3 Any electrical switchgear located on the handlebars or front sub frame may be unplugged or removed as required. Engine starter switch and electric stop switch must be fitted.

8.3 All original electrical equipment not directly related to road use must be fully incorporated in to any modified wiring loom, including generator, CDI, regulator and starter motor.

8.4 All original connections to the CDI must be retained and maintain their normal use.

8.5 The size and type of battery may be changed and / or relocated.

9 Radiator and Oil Cooler

9.1 The original radiator and oil cooler, if fitted, must remain as homologated. Pattern radiators may be substituted but must be the equivalent weight, size and overall specification, including retaining the same mounting points and position as the homologated equipment.

9.2 Radiator hoses may be replaced with those of a similar internal diameter.

9.3 Oil lines may be modified or replaced. Oil lines containing positive pressure, if replaced, must be of metal reinforced construction with swaged or threaded connectors.

9.4 Protective meshes may be added in front of the oil and/or water radiator(s).

10 Air Box / Carburation / Fuel Injection

10.1 The air box may not be altered or replaced from that fitted to the homologated motorcycle.

10.2 The air filter element must be fitted but may be replaced with an after market item.

10.3 The air box inlet rubbers may not be removed or altered.

10.4 Carburettors must be the standard units as on the homologated model. Throttle bodies for fuel-injected machines must be as on the homologated model.

10.5 Carburettor jets and needles may be replaced. Resizing of the air metering holes in CV carburettors slide control is permitted. No other alterations are permitted to the air intake or carburation system.

10.6 Bell mouths may not be added, altered or replaced from those fitted to the homologated motorcycle.

10.7 The fuel injection management system may not be altered or replaced other than the remapping of internally stored fuelling maps.

11 Engine

11.1 Cylinder head, camshafts, cam sprockets, crankshaft, rods, pistons, valves, cylinders and all other engine components must be as homologated. No internal engine, gearbox and clutch parts may be altered or replaced with the exception of the gearshift detent spring, the clutch friction and drive plates and the clutch springs.

11.2 Polishing and lightening of engine parts is not permitted. Balancing or gas flow modifications normally associated with individual tuning are not permitted.

11.3 Compression ratio of the engine must remain as homologated.

11.4 Camshaft timing must remain as homologated.

11.5 No other engine tuning or alteration from the homologated standard is permitted.

11.6 The crankcase/gearbox casing, clutch and generator covers may be protected by additional means, e.g. protective covers made of stainless steel or carbon/Kevlar composites.

11.7 The thermostat may be removed from the housing to aid cooling, if required.

11.8 The maximum horsepower limit for the series is 72 hp SAE measured at the rear wheel. Any machine found to exceed this figure on a dyno selected by the club may be excluded from the results.

11.9 The exhaust air bleed system may be removed. If so, any external fittings on the cam cover(s) must be blocked off or may be replaced by plates.