.040 Piston Gasket Set Valve Seals for Yamaha Raptor 350 2004-2013

Wiseco .040 Piston & Gasket Set for Yamaha Raptor 350

This Wiseco .040 overbore piston and gasket set is engineered to refresh the top end of the Yamaha Raptor 350, restoring compression and performance with a precision-forged piston and a complete sealing package.

Overview

This Wiseco .040 piston and gasket set gives Yamaha Raptor 350 riders a direct way to rebuild a worn or tired top end. The kit pairs an overbore piston with the gaskets and seals needed to complete the job, making it a practical choice for riders, mechanics, and shops handling routine engine service. It is built for the Yamaha Raptor 350 across the 2004 through 2013 model years.

Built For Performance

• .040 inch overbore size for bored cylinders that need cleanup
• Forged piston construction for strength under high-rpm riding
• Complete gasket set that covers the top-end sealing points
• Valve seals included to help control oil consumption
• Designed as a matched piston and gasket package for a single rebuild
• Suited to the Yamaha Raptor 350 engine platform

Fits These Machines

• for Yamaha Raptor 350 (2004)
• for Yamaha Raptor 350 (2005)
• for Yamaha Raptor 350 (2006)
• for Yamaha Raptor 350 (2007)
• for Yamaha Raptor 350 (2008)
• for Yamaha Raptor 350 (2009)
• for Yamaha Raptor 350 (2010)
• for Yamaha Raptor 350 (2011)
• for Yamaha Raptor 350 (2012)
• for Yamaha Raptor 350 (2013)

On-The-Job Use

• Top-end rebuilds on the Yamaha Raptor 350
• Cylinder boring and honing jobs that require an overbore piston
• Restoring compression on high-hour trail and sport quads
• Routine engine service performed by home mechanics and shops

Specs At A Glance

Good To Know

Q: Does this piston require the cylinder to be bored? A: Yes, a .040 overbore piston is designed for a cylinder that has been bored and honed to match the larger diameter. Confirm the machine work is done before assembly.

Q: Can I install this on a stock, unbored cylinder? A: No, the overbore piston will not fit a stock bore. The cylinder must be machined to the correct clearance for the .040 piston.

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