MiniTwins Championship Regulations 2018 (cont.)

12 Transmission

12.1 Additions to gearbox or selector mechanism, such as quick shift systems, are not allowed.

12.2 Clutch springs, friction and drive plates may be replaced.

12.3 Clutch baskets must remain as homologated. The use of slipper clutches is prohibited unless fitted as standard.

12.4 Gear shift detent spring may be replaced with a heavy duty item.

12.5 Front and rear external drive sprockets, chain pitch and chain length can be changed.

13 Ignition and Engine Control System

13.1 Ignition and engine control system (CDI) may not be modified or changed. All units must remain fully interchangeable with available control units.

13.2 No modifications or alterations, whether electronic or mechanical, may be made to the motorcycle to alter the engine ignition timing.

13.3 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.

13.4 Fuel injection mapping may be reprogrammed. Alterations must remain within the capability of the standard fuel injection system as fitted to the homologated machine unless overridden with a permitted control unit.

14 Generator

14.1 The generator, starting system, starter crank gear and starter shaft may not be altered, replaced or removed from those fitted to the homologated motorcycle.

15 Exhaust System

15.1 Exhaust pipe and silencers may be altered or replaced from those fitted to the homologated motorcycle. This must adhere to the maximum noise regulations as set out in the ACU handbook.

15.2 The number of final exit(s) to the exhaust may be altered from that of the homologated machine.

15.3 Wrapping of exhaust systems is not allowed except in the area of the rider’s foot or an area in contact with the fairing for protection from heat.

16 Fasteners

16.1 Standard fasteners may be replaced with fasteners of any material and design. The strength and design must be equal to or exceed the strength of the standard fastener it is replacing for structural applications.

16.2 The use of titanium in the swing arm spindles and the wheels spindles is forbidden. For wheel spindles the use of light alloys is also forbidden. The use of titanium alloy nuts and bolts is allowed.

16.3 Aluminium fasteners may only be used in non-structural locations.

17 Miscellaneous

17.1 The following items MAY BE removed:

17.1.1 Instruments, instrument bracket and associated cables, horn, license plate brackets, tool kit, tachometer, speedometer and wheel spacers, radiator fan and wiring, passenger foot rests, passenger grab rails and upper chain guard.

17.1.2 Emission control items (anti-pollution) in or around the air box and engine (O2 sensors, air injection devices). Please note that any valves or other devices bolted directly to the engine must either be blocked off or removed and replaced with blanking plates.

17.2 The following items MUST BE adhered to:

17.2.1 Motorcycle must be equipped with a functional ignition kill switch or button mounted on the handlebar that is capable of stopping a running engine.The button or switch must be red.

17.2.2 Side stand must be removed.

17.2.3 All drain plugs must be safety wired. External oil filter screws and bolts that enter the oil or water cavities must be safety wired.

17.2.4 Head lamp, rear lamp and turn indicators must be removed. A suitable material must cover the openings. Mirrors must also be removed.

17.2.5 Throttle controls must be self-closing when not held by the hand.

17.2.6 All motorcycles must have a closed breather system. The oil breather line must be connected and discharge in the air box.

17.2.7 Where breather or over flow pipes are fitted they must discharge via existing outlets. The original closed system must be retained; no direct atmospheric emission is permitted.