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Ultimate Power Boost: This kit features a 105
Boost Your Honda XR100's Performance With KPMI® Red Viton Valve Stem Seals
020" fiber Cometic base gasket
Elevate your motorcycle's performance with components that withstand the rigors of high-speed riding and tough terrains
SKF Thrust bearing with washers
PW50 PW 50 Y-Zinger Yzinger Stock Bore WISECO Piston COMETIC Studs Rebuild Kit KVF650 Ultimate Power Boost: This kitComplete Yamaha PW50 top end rebuild kit including 40mm cylinder, cylinder head, Wiseco forged piston, Cometic gasket kit, NGK spark plug, and titanium studs. 1981 2025 Yamaha PW50 Y Zinger Stock Bore Complete Top End Rebuild Kit Wiseco Piston Product Description Restore the legendary reliability of your 1981 2025 Yamaha PW50 Y Zinger with this premium BPRATV Complete Stock Bore Top End Rebuild Kit. Whether you're refreshing a well loved trail bike or