Pro-X
ProX High-Compression Piston Kit (Part # 01.2426.A)
ProX High-Compression Piston Kit (Part # 01.2426.A)
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ProX High-Compression Piston Kit (Part # 01.2426.A)
Upgrade your engine's power and performance with the ProX 01.2426.A High-Compression Piston Kit. Precision CNC-machined in Japan to exact OEM tolerances, ProX piston kits are crafted from a low-expansion, low-friction high-silicon aluminum alloy—the same alloy utilized by major Japanese factory manufacturers. Designed as a premium, direct-fit replacement, this kit offers superior durability, optimal heat dissipation, and crisp throttle response.
Key Features
High-Compression Design: Delivers a 13.0:1 compression ratio for increased torque and low-to-mid range throttle response.
Complete Kit: Includes piston, wrist pin, piston rings, and circlips for a hassle-free rebuild.
Precision Japanese Engineering: Manufactured using CNC machinery to meet or exceed strict OEM specifications.
Standard Bore ("A" Size): Fits standard bore cylinders without requiring resleeving or overboring.
Fitment
Yamaha YZ450F (2003–2009)
Yamaha WR450F (2003–2011)
Note: Please double-check your cylinder measurements and part number requirements prior to installation to ensure proper piston-to-wall clearance.
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