Wiseco Std Piston Crankshaft Gasket Set 77.00 mm for Yamaha WR250F 2005-2013 12.

Wiseco Std Piston/Crankshaft/Gasket Set for Yamaha WR250F

This Wiseco standard piston, crankshaft, and gasket set is built for the Yamaha WR250F, restoring top-end and bottom-end performance with a 77.00 mm bore and 12.5:1 compression ratio.

Overview

This Wiseco Std Piston/Crankshaft/Gasket Set for the Yamaha WR250F delivers a complete rebuild solution for riders who demand reliable, race-proven internals. The 77.00 mm piston with a 12.5:1 compression ratio restores factory-spec power delivery, while the crankshaft and full gasket set keep the rebuild sealed and balanced. It is intended for mechanics and enthusiasts rebuilding 2005-2013 Yamaha WR250F engines.

Built For Performance

• 77.00 mm standard bore piston matched to the factory cylinder
• 12.5:1 compression ratio for strong midrange and top-end response
• Crankshaft included for complete bottom-end refresh
• Full gasket set seals the top and bottom end during reassembly
• Wiseco forged construction for durability under high-rpm use
• Kit format reduces guesswork when sourcing matched components

Fits These Machines

• for Yamaha WR250F 2005
• for Yamaha WR250F 2006
• for Yamaha WR250F 2007
• for Yamaha WR250F 2008
• for Yamaha WR250F 2009
• for Yamaha WR250F 2010
• for Yamaha WR250F 2011
• for Yamaha WR250F 2012
• for Yamaha WR250F 2013

On-The-Job Use

• Top-end and bottom-end engine rebuilds
• Trail and enduro riding where reliability matters
• Motocross and off-road competition maintenance
• Restoring a worn or smoking WR250F engine
• Preventive refresh before a riding season

Specs At A Glance

Good To Know

Q: Does this kit fit my 2005-2013 Yamaha WR250F? A: It is listed for Yamaha WR250F models from 2005 through 2013 with a 77.00 mm standard bore and 12.5:1 compression. Confirm your engine serial number and cylinder condition before ordering.

Q: Can I install this kit without machining the cylinder? A: A standard bore piston is designed to match a factory-spec cylinder in good condition. Measure cylinder wear and check for scoring before installation.

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