Wiseco Pistons 40109M08350 High-Performance Piston Kit Compression - 83.5mm 11 1

The Wiseco 40109M08350 is a high-performance piston kit designed for Yamaha YFM350 ATVs from 1987-2013. This 83.5mm bore piston features an 11:1 compression ratio, delivering increased horsepower and torque for improved performance across all YFM350 models including Warrior, Big Bear, Bruin, and Raptor applications.

Key Features:

• Forged from high-silicon aluminum alloy for maximum strength and dependability
• 83.5mm bore diameter with 11:1 compression ratio for enhanced performance
• Innovative forging design and piston skirt geometry maximize power output
• Complete kit includes piston, rings, wrist pin, and circlips
• Precision-machined ring grooves ensure optimal ring seal and longevity
• Compatible with all Yamaha YFM350 models from 1987-2013

Wiseco pistons are engineered using advanced forging techniques to create a stronger, more durable piston than cast alternatives. The high-silicon aluminum alloy composition provides excellent heat dissipation and wear resistance, making this piston ideal for both performance and reliability upgrades. Note that oversize pistons require cylinder boring or sleeving for proper installation.