Wiseco Std Piston Crankshaft Gasket Set 77.00 mm for Yamaha YZ250F 2008-2011 13.

Wiseco Std Piston/Crankshaft/Gasket Set for Yamaha

This Wiseco Std Piston/Crankshaft/Gasket Set for Yamaha YZ250F 2008-2011 rebuilds the engine with a 77.00 mm piston at 13.5:1 compression, a matched crankshaft, and a full gasket set for dependable performance.

Overview

The Wiseco Std Piston/Crankshaft/Gasket Set for Yamaha YZ250F 2008-2011 brings together the primary rotating and sealing parts for a complete engine rebuild. With a 77.00 mm piston at 13.5:1 compression and a matched crankshaft, this kit keeps the top and bottom end working in sync for riders who expect consistent power. It is built for mechanics and riders refreshing an older YZ250F engine with quality aftermarket components.

Built For Performance

• 77.00 mm standard bore piston designed for the YZ250F cylinder
• 13.5:1 compression ratio supporting strong combustion and response
• Matched crankshaft engineered for high-rpm four-stroke loads
• Complete gasket set included for a full engine rebuild
• Wiseco aftermarket parts made for consistent fit and finish

Fits These Machines

• for Yamaha YZ250F 2008
• for Yamaha YZ250F 2009
• for Yamaha YZ250F 2010
• for Yamaha YZ250F 2011

On-The-Job Use

• Top and bottom end rebuilds after piston or crankshaft failure
• Restoring lost compression on a tired YZ250F engine
• Scheduled teardown during race season servicing
• Replacing worn internals on a high-hour four-stroke

Specs At A Glance

Good To Know

Q: Can this kit be used for a complete engine rebuild? A: It includes a piston, crankshaft, and gasket set, covering the main components for a top and bottom end refresh. Depending on engine condition, bearings or additional hardware might still be required.

Q: Is the 77.00 mm piston a stock replacement size? A: Yes, 77.00 mm is the standard bore, so measure the cylinder first to confirm it has not been overbored. Verify clearances during assembly for a proper fit.

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