Wiseco Piston Kit 95mm STD 12:1 Armorglide – Yamaha YFZ450 / YFZ450R (2004–2018)

Wiseco Forged Piston Kit – 95.00mm STD Bore / 12:1 Compression — Yamaha YFZ450 & YFZ450R (2004–2018) — 4865M09500

Built for serious racers and aggressive riders, the Wiseco 95.00mm forged piston kit is precision-engineered for maximum strength, durability, and performance. Featuring Armorglide skirt coating for reduced friction, this piston delivers smoother operation, longer life, and race-winning reliability. With a 12:1 compression ratio, you’ll gain a noticeable increase in power and throttle response while maintaining compatibility with pump or race fuel.

Each kit includes piston, rings, wrist pin, and circlips, making it a direct-fit top-end rebuild solution for Yamaha YFZ450 and YFZ450R models.

Features

• Forged from high-silicon, low-expansion aluminum for superior strength and reduced weight

• Armorglide skirt coating reduces friction and cylinder wear for longer service life

• Diamond-turned CNC finish guarantees perfect sizing and fitment with no size variation

• Compatible with any cylinder bore composition, including OEM and aftermarket plated cylinders

• 12:1 compression ratio boosts horsepower and torque without sacrificing reliability

• State-of-the-art manufacturing ensures precision and consistency

• Includes piston, rings, wrist pin, and circlips

Fitment

• Yamaha YFZ450R: 2009–2018 (including SE models)

• Yamaha YFZ450: 2004–2013 (including Bill Balance Edition and SE models)

• Yamaha YFZ450X: 2010–2011 (including SE)

Part Details

• Part Number / Brand Number: 4865M09500 (4865PS)

• Weight: 0.98 lbs

• Package Dimensions: 5.00 × 5.00 × 4.50 in