03-09 Yamaha YZ450F/03-15 WR 12.5:1 CR Piston Kit

• UPC: 193564140579

This piston kit is designed for Yamaha YZ450F (2003-2009) and WR (2003-2015) models. It features a 12.5:1 compression ratio for enhanced engine performance. Crafted from high-silicon, low-expansion aluminum, the piston offers superior strength, reduced weight, improved heat transfer, and extended durability. Its lightweight forging ensures instant throttle response and maximized torque, while the race-ready dome design enhances combustion flow. The piston incorporates advanced engineering, including computer-designed skirt profiles for minimized cylinder wall friction and anti-detonation grooves that improve reliability and performance by reducing ring blow-by. The armor glide skirt coating reduces friction, making it suitable for racing applications. Each kit includes a piston, rings, wrist pin, and circlips, ensuring a complete installation solution. The diamond-turned finish guarantees precise fitting with no size variation, making the pistons compatible with modern cylinder bore compositions. These pistons are designed to withstand the demands of high-performance racing while also being suitable for recreational use. Oversized pistons in this kit require cylinder sleeving for proper installation.