Wossner Piston Yamaha YFM400 Big Bear 00-12 size:Piston Oversize (+0.50mm) Fits any 10 or 12mm

Fits any 10 or 12mm spark plug hole

Spark plug hole internal diameter (bottom): 9 mm

Don’t let the 4” x 2” size and 3

There is a zip-up compression suit with built-in shoulder and elbow impact protectors and also a height-adjustable kidney belt

Wossner Piston Yamaha YFM400 Big Bear 00-12 size:Piston Oversize (+0.50mm) Fits any 10 or 12mmWossner is Germany's finest aftermarket forged piston and rod manufacturer and have over 25 years of experience in the high performance racing industry. Top European racers and FIM World Champions rely on Wossner for only the best pistons, rods and customer service. Features In house designed and manufactured; all forgings are produced in Wossner's company owned forging operation 4 stroke pistons are made using a double bridged forging design