4292M06750 Wiseco .020 Piston for Yamaha YFM 200 Moto-4 87-88 67.50mm 10.25:1

.020 Piston for Yamaha

This Wiseco .020 overbore piston is for the Yamaha YFM 200 Moto-4 and restores compression in a worn top end, with the 67.50mm bore matching OEM cross-reference 4292M06750.

Overview

This Wiseco piston is a .020 overbore replacement for the Yamaha YFM 200 Moto-4, sized at 67.50mm with a 10.25:1 compression ratio. It replaces a worn or scored piston to bring compression and power back to the top end. The piston is built for riders and mechanics rebuilding 1987 to 1988 YFM 200 Moto-4 engines.

Built For Performance

• 67.50mm bore size, .020 inch overbore over the standard piston
• 10.25:1 compression ratio for strong throttle response
• Cross-references OEM part 4292M06750
• Forged construction for strength under load
• Machined ring grooves for consistent ring seal
• Sized for a cylinder bored to the matching oversize

Fits These Machines

• for Yamaha YFM 200 Moto-4 1987
• for Yamaha YFM 200 Moto-4 1988

On-The-Job Use

• Top end rebuilds on worn YFM 200 Moto-4 engines
• Cylinder boring to the .020 oversize
• Restoring compression on high hour quads
• Trail and utility riding where torque matters

Specs At A Glance

Good To Know

Q: Does this piston need a bored cylinder? A: Yes, a .020 overbore piston requires the cylinder bored and honed to the matching 67.50mm size before assembly.

Q: Should I replace the rings and pin at the same time? A: Replacing the rings, pin, and clips along with the piston is standard practice during a top end rebuild.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.