China 4Takt pulley fixing tool This simple but effective tool for holding Chinese 4-stroke scooter engines, disassembling and assembling the variator or light machine components succeeds in no time The locking tool is simply screwed on and locked the Starter crown after the central nuts can be fixed on the crankshaft with a simple wrench (variator or alternator). For all 50cc 4-stroke engines of all Chinese scooter manufacturers, whether 2-valve (139QMA, 139QMA) or the latest scooter with 4 valves per cylinder