Wiseco 40111M09700 Forged Piston Kit Yamaha YZ450F 12.5:1 Compression Ratio 97mm Bore

The Wiseco 40111M09700 is a high-performance forged piston kit designed for the 2014 Yamaha YZ450F, delivering a 12.5:1 compression ratio with a 97mm bore diameter. Engineered for serious motocross competition, this piston is crafted from a high-silicon aluminum alloy that provides exceptional strength-to-weight ratio, thermal stability, and long-term durability under high-RPM racing conditions.

Key Features:

• Forged high-silicon aluminum alloy construction for maximum strength and fatigue resistance
• 12.5:1 compression ratio optimized for peak power output on the YZ450F platform
• 97mm bore diameter for precise cylinder fitment
• Innovative forging profile and optimized piston skirt geometry for maximum horsepower and torque
• Low-friction skirt coating reduces wear and improves break-in characteristics
• Complete kit includes: forged piston, piston rings, wrist pin, and circlips

Important Notes:

• Oversize pistons require professional cylinder boring or sleeving to the appropriate diameter
• Always verify bore size before ordering to ensure proper fitment

Wiseco is a leading name in aftermarket forged pistons trusted by professional and amateur motocross racers worldwide. The 40111M09700 kit gives YZ450F riders a direct, bolt-in upgrade path with OEM-quality reliability and race-proven performance.