TWOM Cylinder Piston Gasket Top End Rebuild Kit For Yamaha Big Bear & Kodiak 400 – 1993–2012, 83mm Bore, 386cc

Time to breathe new life into that Yamaha 400 ATV?

This TWOM top end kit fits Kodiak 400 (1993–1999) and Big Bear 400 (2000–2012).

Comes with a cylinder, piston, rings, wristpin, circlips, head gasket, base gasket—plus a tensioner gasket and o-ring.

Piston diameter is 82.9mm, pin’s 19mm, bore is 83mm.

Displacement’s 386cc.

All the OEM numbers match up: cylinder’s 5FU-11310-01-00, piston’s 4GB-11631-00-Y0, rings cross to 4GB-11610-00, etc.

Silver piston, as shown.

Brand new, ready to install, and we’ve got it in stock.

If your ATV’s smoking or down on compression, this kit’s your ticket.