Wiseco Std Piston Crankshaft Gasket Set 77.00 mm for Yamaha YZ250F 2003-2004 12.

Wiseco Std Piston/Crankshaft/Gasket Set for Yamaha

This Wiseco Std Piston/Crankshaft/Gasket Set for Yamaha is a comprehensive engine rebuild kit featuring a 77.00 mm standard bore piston at 12.5:1 compression, a crankshaft, and a matching gasket set.

Overview

This Wiseco Std Piston/Crankshaft/Gasket Set for Yamaha provides all major components needed to rebuild the YZ250F 2003-2004 engine. The 77.00 mm standard bore piston at 12.5:1 compression returns factory power, while the crankshaft and gasket set cover both top and bottom end work. It is suited to riders and mechanics handling complete engine service.

Built For Performance

• Forged piston construction for strength under load
• 77.00 mm standard bore size for stock cylinders
• 12.5:1 compression ratio for factory-spec power
• Crankshaft included for bottom end rebuilds
• Complete gasket set for a sealed assembly

Fits These Machines

• for Yamaha YZ250F 2003
• for Yamaha YZ250F 2004

On-The-Job Use

• Top end rebuilds after piston or ring wear
• Bottom end service for worn crankshaft bearings
• Engine refresh on motocross bikes
• Restoring stock compression after tear down

Specs At A Glance

Good To Know

Q: Does this kit cover both top and bottom end work? A: Yes, the set includes a standard bore piston, crankshaft, and gasket set for a complete rebuild.

Q: What compression does this piston provide? A: It delivers a 12.5:1 compression ratio at the 77.00 mm standard bore size, matching the original engine spec.

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