Athena 47.6mm Air Cooled Vertical Minarelli/Yamaha Zuma Big Bore Cylinder and Head Kit. Kit includes cylinder, cylinder head, piston, ring, piston pin, cir clips, head gasket, base gasket, exhaust gasket and carbon fiber reeds. When you use this Athena 47.6mm Big Bore Kit you will increase your total displacement to 70cc! Aluminum Construction with Nickel Carbide Plated Bore.
Cylinder Sleeve Outer Diameter: 50.75mm. Compression Height (from center of wrist pin hole to top edge of piston): 26mm. You may need to modify your engine case to accommodate the larger cylinder.We will receive the item and inspect it. Not all performance/upgrade parts come with instructions. It is the customer's responsibility to have common knowledge of installation or hire an experienced installer. We are not responsible for any damage that may be caused by any of the items we sell, whether installed by you or a professional. In any case, we will always do our best to help you with any technical questions that you may have.
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