Engineered as a Standard Bore 69mm piston kit for the Bayou 250 ATV family, this Aftermarket Replacement piston kit restores factory compression and dependable power for engines built between 2003 and 2011. It’s precisely sized to a 69mm bore to deliver consistent compression and reliable top-end performance after a rebuild. The kit is a straightforward, OEM-equivalent solution that helps maintain the original riding feel and throttle response when you refresh the engine’s top end.

Designed to tackle common wear from trail work and farm duties, this aftermarket piston kit targets worn piston skirts, ring land wear, and degraded compression that slow throttle response and increase oil burn. Built with a robust aluminum piston and matched rings, wrist pin, and circlips, it provides durable, repeatable performance under rugged conditions and repetitive maintenance cycles.

Comprehensive Vehicle Fitment

Product Specifications

OEM & Aftermarket Cross-Reference Information

What's Included

The box includes essential top-end components needed for a reliable rebuild of the 69mm standard-bore kit.

• Piston
• Piston Rings
• Piston Pin
• Circlips (2)

Note: Cylinder, base gasket, head gasket, and additional top-end hardware are not included with this piston kit and may be sold separately or as part of a full top-end rebuild set.

Why Choose This Aftermarket Replacement?

• Direct-Fit Compatibility: Precisely matched 69mm standard bore for seamless installation on 2003–2011 Bayou 250 engines.
• OEM Cross-Reference: Backed by Kawasaki part numbers (13001-1663, 13001-1654, 13002-1004, 13008-1209, 92033-1161) for straightforward sourcing and verification.
• Premium Materials: Aluminum piston with durable rings and a robust wrist pin designed to endure off-road heat and vibration.
• Performance Restoration: Restores original compression and throttle response after a top-end refresh, helping regain lost power.
• Reliability for Trail and Farm: Built to withstand dirt, dust, and repeated maintenance cycles common to utility riding.
• Cost-Effective Aftermarket Solution: A practical alternative to OEM pricing while maintaining near-OEM performance and durability.

Installation Notes:

• Prep the bore: Clean and measure the cylinder bore to confirm a true 69.0 mm diameter before assembly.
• Orientation matters: Install the piston with correct orientation and ensure the wrist pin and circlips seat fully without distortion.
• Ring gaps and seating: Break in the new rings with proper end-gap staggering and avoid flexing or twisting during installation.
• Piston rings lubrication: Lightly coat the piston rings and skirt with clean engine oil to ease initial startup and seating.
• Gasket considerations: If reusing or upgrading, verify gasket surfaces are clean, flat, and free of debris to prevent compression leaks.
• Manual torque reference: Follow the service manual for torque specs on related fasteners (cylinder head bolts, etc.) during reassembly and perform a careful hand-turn check before starting the engine.

Why Upgrade?

Running a worn piston kit compromises compression, throttle response, and overall reliability, increasing the risk of oil burning and heat-related damage. Upgrading to this 69mm standard-bore kit restores compression, improves power delivery, and promotes consistent performance under demanding trail and farm conditions.