Honda TRX 400EX XR 400X Sportrax 400 85mm 10:1 Aftermarket Stock Bore Piston Kit XR600R The Cometic gasket set ensures

The Cometic gasket set ensures a reliable seal

Genuine Polaris OEM cylinder

Balancer bearings

As good as K&N for far less money

This kit is not DIY

Honda TRX 400EX XR 400X Sportrax 400 85mm 10:1 Aftermarket Stock Bore Piston Kit XR600R The Cometic gasket set ensures12100 KCY 670, 4606M08500, C7825, 12191 KCY 673, 13011 KCY 670, 90601 KA5 000, 13103 KCY 670, 13111 KCY 670, 12251 HN1 003, PK1031,Affordable 85mm 10: 1 stock bore piston kit for Honda TRX400EX, XR400R, and TRX400X models (19962014). Complete with piston, rings, and wrist pin. Reliable OEM replacement from BPRATV. Honda TRX 400EX XR 400X Sportrax 400 85mm Stock Bore 10: 1 Piston Kit Reliable Stock Replacement Piston Kit for Honda 400cc Models Upgrade