Vertex 22567A Forged Replica Piston Kit - Standard Bore 91.93mm, 12.5:1 Compression

Bore: 91.93mm
Compression: 12.5:1 Compression
Sizing: Standard Bore

All piston skirts are coated with a hi-tech Molybdenum Disulphite coating for faster break-in time and increased piston life. Cast Replica piston kits are gravity cast aluminum alloy (not forged) with 18% silicone content, which produces an extremely light but very strong piston. Forged Replica pistons are forged from 2618 aluminum for superior strength and durability. Forged High Compression pistons improve power and torque across entire rpm range. Forged Big Bore pistons increase engine's displacement, torque, and peak horsepower. Forged Replica pistons are forged OE replacements. All pistons are heat treated with a T-5 hardening and tempering cycle. Replica pistons and all rings are OEM replacements. Kits include piston, rings, wrist pin and circlips. Two stroke replacement rings are sold individually (Example if your piston has two rings you will want to order two rings). Four-stroke piston rings sold as a set. Forged Replica pistons - Forged replacement for a OE cast piston for better strength. Forged Replica - Forged OE stock compression piston.

Vehicle Fitment:

1998-2000 Yamaha WR400F
1998-1999 Yamaha YZ400F