Wiseco Std Piston Crankshaft Gasket Set 77.00 mm for Yamaha YZ250F 2012-2013 13.

Wiseco Std Piston/Crankshaft/Gasket Set for Yamaha

This Wiseco Std Piston/Crankshaft/Gasket Set for Yamaha YZ250F 2012-2013 restores top and bottom end performance with a 77.00 mm piston at 13.5:1 compression, a matched crankshaft, and a complete gasket set for a full rebuild.

Overview

The Wiseco Std Piston/Crankshaft/Gasket Set for Yamaha YZ250F 2012-2013 delivers the core rotating and sealing components needed for a complete engine refresh. The 77.00 mm piston at 13.5:1 compression and matched crankshaft work together to keep the top and bottom end in balance for riders who demand reliable power. This kit suits mechanics and race teams rebuilding a YZ250F engine with quality aftermarket parts.

Built For Performance

• 77.00 mm standard bore piston sized for the YZ250F cylinder
• 13.5:1 compression ratio for strong combustion and throttle response
• Matched crankshaft built to handle the loads of a high-revving four-stroke
• Complete gasket set included for a full engine rebuild
• Wiseco aftermarket parts engineered for consistent fit and finish

Fits These Machines

• for Yamaha YZ250F 2012
• for Yamaha YZ250F 2013

On-The-Job Use

• Top and bottom end rebuilds after a piston seizure or crank failure
• Restoring compression on a worn YZ250F engine
• Preventive teardown during race season maintenance
• Replacing fatigued internals on a high-hour four-stroke

Specs At A Glance

Good To Know

Q: Does this kit include everything needed for a full rebuild? A: It bundles a piston, crankshaft, and gasket set, which covers the major wear items for a top and bottom end refresh. Additional bearings or hardware may still be needed depending on the engine's condition.

Q: Is a 77.00 mm piston the stock size for this engine? A: A 77.00 mm bore is the standard size, so measuring the cylinder before ordering confirms whether it has been overbored previously. Check clearances during assembly to ensure correct fit.

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