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GY6 50 70cc 47mm Cylinder Kit from Naraku
Bolts right up no engine case bore needed.
No problem using stock head stock exhaust and cam, although these can be added for even better preformance. This is according to Naraku
Its always good to jet and add air filter when doing upgrades to cylinder. On most four stroke scooters this kit works fine with stock jet and air filter.
48 Lower States Only