Streetstock regulations
Engine capacity
Maximum 125cc/Minimum 115cc OE engine
The use of superchargers or turbochargers is prohibited
Engine type
Only four stroke OE homologated road engines.
No competition engines
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Chassis
Seat subframe may be modified/changed
Fuel mapping
Fuel mapping plug in boxes eg. power commanders/resistors/ignition boxes can be fitted including after market ECU/CDI
Exhaust front pipe maybe modified or replaced
The only permitted end can for 4 stroke engines will be the factory Original Equipment or an “unmodded/undamaged” powertech
Fuel injection
Standard ECU can be replaced. Standard airboxes must remain original and only the external rubber boot may be removed. Maximum hole size to be no more than 4225mm².
Tuning
Some engine Tuning is permitted on Yamaha, Honda, KTM & Kawasaki. These manufacturers can run high compression pistons and race cams. Suzuki engines must remain OE standard with no modifications at all.
Starter motors if originally fitted must remain and be functional.
Cutting of the ignition/fueling for the purpose of changing gears is allowed by a quickshifter mechanism.
Bodywork
Any aftermarket fibreglass bodywork is permitted
Standard road bodywork is permitted but must have mirrors/stands removed. Head lamp and rear light glasses must be adequately taped to prevent splintering. Unused wiring for lights and switches etc may be removed.
Replacement parts, only OE or pattern to OE spec parts can be used in engines
Forks
The forks must remain standard OE, any internal modifications are allowed, external preload adjusters allowed.
ANY forks fitted to the same make/model of bike irrespective of year eg YZF-125 any year YZF-r125 forks/wheels, CBR125 any year forks/wheels “BUT” all parts must be originally fitted from the same Manufacturer
Suspension
Rear shocks can be modified/replaced with no restrictions as long as they fit the original mounting points
Brakes
Pads, lines, master cylinders, discs, and footrest/hangers are allowed to be changed. Disc’s must remain the OE diameter for the model of bike.
Chain & sprockets
Any chain and sprocket size can be used
Wheels
Remain OE fitment for manufacturer permitted size 16″ 17″ 18″. wheel spacers may be changed
Tyres
Any tyres permitted, tyre warmers are also allowed.
General
The only liquid engine coolant permitted is water
Oil sump plug and filler plug must be lock wired
A red rain light fitted to the rear of the Motorcycle
Anything not mentioned in the above rules has to be agreed by the committee.
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