Naraku big bore cylinder kit with 60cc bore engine for scooters with 50cc Minarelli 4-stroke engines. The 42mm cylinder provides a noticeably better torque compared to the 38mm original cylinder. The Naraku cylinder is used with the original 38mm cylinder head. Not alteration to the crankcase is required. Delivery includes: Cylinder, piston, piston rings incl. oil scraper rings, gudgeon pins, gasket set and retaining clips for the gudgeon pin.