OS 0.50 Piston Kit for Kawasaki KLF 250 Bayou is an aftermarket replacement engineered to restore compression and bring back the power you expect from your ATV. Specifically designed for Kawasaki KLF 250 Bayou models from 2003 through 2011, this oversize piston kit returns a proper seal against the bore and helps reclaim throttle response when installed with proper technique. It’s a reliable, drop-in solution that maintains consistent performance across the Bayou lineup during its intended years of service.

This OS 0.50 kit targets the typical wear-and-tear that accumulates in high-mileage Bayous - loss of compression, rough idling, and diminished power from a worn piston bore and rings. By delivering a precise +0.50 mm oversize piston that aligns with stock bore tolerances, it helps restore power, reliability, and smooth operation for trail rides or farm work where consistent performance matters most. When paired with correct installation practices, this aftermarket replacement provides dependable long-term operation across 2003 - 2011 Kawasaki KLF 250 Bayou engines.

What's Included

This OS 0.50 piston kit ships with the essential components required to complete a top-end replacement on the Kawasaki KLF 250 Bayou (2003 - 2011):

• Piston
• Rings
• Wrist Pin
• Circlips

Related gaskets and engine seals are not included unless listed.

OEM & Aftermarket Cross-Reference Information

Fitment

Specifications

Installation Notes

• Inspect the bore: Before assembly, measure bore diameter to confirm it aligns with the 69.47 mm specification and the +0.50 mm oversize requirement.
• Rings and orientation: Install rings with correct orientation and ensure gaps are aligned per the OEM/service manual recommendations.
• Lubrication: Apply assembly lube to the piston skirts and rings to prevent dry starts.
• Piston orientation: Check for any marked orientation on the piston and install in the correct direction to maintain proper combustion chamber geometry.
• Wrist pin and clips: Secure the wrist pin with new circlips and verify they sit flush to avoid premature failure.
• Torque and clearances: Follow the manufacturer’s service manual for any required torque specs on top-end fasteners and verify end-gap tolerances after assembly.