4693M09500 Wiseco Std Piston Kit 95mm 12.5:1 for Yamaha YZ426F WR426F 2000-2002

Wiseco Std Piston Kit for Yamaha YZ426F/WR426F

This Wiseco standard bore piston kit for Yamaha YZ426F and WR426F models delivers 95mm bore with 12.5:1 compression, cross-referencing part 4693M09500 for direct fitment.

Overview

This Wiseco standard piston kit is built for Yamaha YZ426F and WR426F owners who need a reliable top-end rebuild at stock bore size. The 95mm piston with 12.5:1 compression restores factory-spec performance. Each kit is engineered for riders who demand consistent power delivery from their 426cc four-stroke.

Built For Performance

• 95mm standard bore diameter matches original cylinder sizing
• 12.5:1 compression ratio for strong mid-range and top-end power
• Forged aluminum construction for durability under high-rpm use
• Cross-references OEM part 4693M09500 for straightforward sourcing
• Complete kit includes piston, rings, pin, and clips

Fits These Machines

• for Yamaha YZ426F 2000
• for Yamaha YZ426F 2001
• for Yamaha YZ426F 2002
• for Yamaha WR426F 2000
• for Yamaha WR426F 2001
• for Yamaha WR426F 2002

On-The-Job Use

• Top-end rebuilds on YZ426F motocross bikes
• WR426F trail and enduro engine refreshes
• Restoring compression on high-hour engines
• Routine piston replacement during valve service

Specs At A Glance

Good To Know

Q: Is this a standard bore or oversize piston? A: This is a standard 95mm bore piston kit, so it fits a stock cylinder without boring.

Q: What does the 12.5:1 compression ratio mean for my engine? A: It matches the factory compression spec, so you get stock-level power without requiring fuel or head modifications.

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