Minitwins have to remain as homologated, that means no changes to the following
Engine, internal gears/gearbox, injectors, fork externals, frame, swingarm, wheels, brake calipers and master cylinders, axles, yolks, radiator,. So no internal engine work at all and a 72bhp limit. No total loss so must have original charging circuit. original ECU
You can change bodywork, clip-ons, rear sets, move the battery, clocks, fairings and mounting points, front and rear subframe, exhaust system and end can, brake disks and lines, levers, rear shock, fork internals, add a power commander or reflash the ECU.
Best read through the regs on
www.minitwins.co.uk as already stated.