234M07000 Wiseco Std Piston Kit for Yamaha YZ250 1976-1979 70.00 mm

Wiseco Std Piston Kit for Yamaha YZ250

This Wiseco standard bore piston kit for Yamaha YZ250 models restores top end compression with a 70.00 mm piston, cross-referenced to part 234M07000.

Overview

This Wiseco Std Piston Kit for Yamaha YZ250 is a standard bore top end replacement built to bring compression and power back to a worn engine. The 70.00 mm piston kit matches the original bore size, making it a straightforward rebuild choice for riders and mechanics working on the YZ250. Each kit is referenced to Wiseco part 234M07000 for confident ordering.

Built For Performance

• 70.00 mm standard bore size matches the original cylinder diameter
• Forged piston construction for strength under high rpm loads
• Kit includes piston, rings, wrist pin, and circlips for a complete top end refresh
• Cross-reference 234M07000 simplifies parts lookup and ordering
• Designed for the Yamaha YZ250 two-stroke engine platform

Fits These Machines

• for Yamaha YZ250 1976
• for Yamaha YZ250 1977
• for Yamaha YZ250 1978
• for Yamaha YZ250 1979

On-The-Job Use

• Top end rebuilds after piston wear or seizure
• Routine motocross engine maintenance
• Restoring compression on a tired YZ250 engine
• Off-road and trail bike repair work

Specs At A Glance

Good To Know

Q: Does this kit fit a standard bore YZ250 cylinder? A: Yes, the 70.00 mm piston is sized for the standard bore, so confirm your cylinder has not been overbored before ordering.

Q: What is included in the kit? A: The kit supplies the piston along with the matching rings, wrist pin, and circlips needed for 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.