Seller notes

Athena Big Bore Hyper Race Cylinder Kit 081000/1 The race version of the popular Athena 70cc big bore kit, available in one part number. All parts are available separately for custom builds. Includes: Shaped, domed cylinder head, state of the art cylinder with special porting, lighter flat top piston assembly (all of which are designed for higher compression and improved combustion efficiency), Replacement of clutch rollers and springs may be needed for proper tuning Cylinder kits include cylind...

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