ProX 4-Stroke Piston Kit (76.98mm / Size C) 01.4337.C - Kawasaki KX250F 2006-2009

Product Description

The ProX 01.4337.C 4-Stroke Piston Kit provides a complete, precision-engineered top-end component package designed specifically for the Kawasaki KX250F. Engineered for riders servicing their 250cc engine, this standard Size C assembly provides an exact 76.98mm outer diameter dimension to match cylinders requiring a 77.00mm standard bore tolerance. Each kit arrives as a complete assembly including the piston, piston rings, wrist pin, and circlips for a comprehensive top-end overhaul.

Manufactured using dedicated low-expansion, low-friction aluminum alloy, this piston is precision machined on modern CNC equipment to maintain stability under extreme thermal cycling. The non-coated skirt profile and 13.5:1 compression ratio mirror the mechanical requirements of the four-stroke engine platform, ensuring proper combustion chamber sealing, minimal wall friction, and balanced operation across the entire power curve.

Top Features: ProX Piston Kit

• Manufactured from low-expansion, low-friction aluminum alloy to maintain structural rigidity under high operating temperatures.
• Machined on computer numerical control (CNC) equipment to deliver exact tolerances for a 77.00 mm standard bore.
• Maintains a 13.5:1 compression ratio tailored for the four-stroke 250cc combustion chamber profile.
• Complete rebuild kit configuration includes the aluminum piston, matched rings, wrist pin, and retaining circlips.

Please review the detailed compatibility data below to ensure an exact fitment match for your motorcycle before finalizing your purchase.

Fitment List

Frequently Asked Questions

Q: What specific components are included with this ProX piston kit?
A: The kit includes one 76.98mm Size C aluminum alloy piston, a matched ring set, a wrist pin, and two circlips.

Q: What is the designated cylinder bore size and compression ratio for part number 01.4337.C?
A: This piston is engineered for a standard 77.00mm cylinder bore and produces a 13.5:1 compression ratio.

Expert Pro-Tip: Always measure your cylinder bore with a dial bore gauge at the top, middle, and bottom of the stroke before installation to verify cylinder roundness, taper, and piston-to-cylinder clearance. When installing the circlips, position the open gap facing downward at the 6 o'clock position (or 12 o'clock) perpendicular to the piston stroke to prevent inertia-induced clip dislocation at high RPM.

Recommended Pairings:

• Kawasaki KX250F Performance Parts & Upgrades
• Kawasaki 4-Stroke Performance Parts
• Motorcycle Tools & Accessories

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