Seller notes

Athena S4C05800001B Piston Kit (144cc Big Bore) (B) - 4.00mm Oversize to 57.95mm, 14.0:1 Compression Bore: 57.95mm Compression: 14.0:1 Compression Sizing: 4.00mm Oversize All pistons are forged using a precision heat-treatment process that allows for production tolerances of just .005mm. Forged piston kits are available in A, B and C sizing. Forged piston tooling allows for the lightest available product. Kits include antiwear coated piston, rings, pin and circlip. Made in Germany. fits YAM YZ12...

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