Wiseco Pistons 4694M09500 Forged Piston Kit Compression - 4-Stroke 95mm 13.5 1 YZ426F

The Wiseco 4694M09500 is a 4-Stroke Forged Series Piston Kit featuring a 95.00mm standard bore and 13.5:1 high-compression ratio, purpose-built for the Yamaha YZ426F and WR426F. Engineered, forged, and machined in the USA at Wiseco's facility in Mentor, OH, this piston kit is built to the tightest tolerances for the ultimate combination of performance and durability.

Key Features:

• Forged high-silicon, low-expansion aluminum alloy construction for superior strength, reduced weight, improved heat transfer, and longer service life
• 13.5:1 high-compression ratio for maximum power output from the 426cc engine
• 95.00mm standard bore (STD oversize) with a 60.1mm stroke
• Dedicated forging design allows for an optimized strength-to-weight ratio
• Diamond-turned CNC finish ensures precise sizing with no variation
• Designed specifically for 4-stroke powersports engines for a perfect application fit

Kit Includes:

• Forged piston
• 3741XS – 95.00mm ring set
• S660 – 19mm wrist pin (1.986 in.)
• CW19 – Round wire pin locks, 19mm (pair)

Wiseco's forged 4-stroke piston kits are proven at every level of riding and backed by over 70 years of racing and performance engine experience. Note: Oversize pistons require cylinder sleeving.