OS 0.25 Piston Kit for KVF360 Prairie 360 ATV engines is a complete rebuild package designed to restore compression and power in models produced from 2003 through 2010. This oversize kit refreshes the 362cc SOHC single‑cylinder layout, helping recover peak power, throttle response, and overall engine efficiency after bore wear in demanding off‑road use. The kit includes a cast aluminum alloy piston sized for a 0.25mm oversize bore, along with rings, wrist pin, and circlips for a true, drop‑in rebuild path. If your KVF360 engine is showing reduced compression and performance, this OS 0.25 kit delivers a reliable route back to factory-like performance.

From the trail to the job site, this aftermarket rebuild option is designed to restore reliable power without swapping out other engine components. The oversize bore allows a precise re‑ring and seating, delivering improved compression and throttle response while maintaining compatibility with the KVF360 family’s 362cc displacement and single‑cylinder architecture. Built to exact tolerances, it’s engineered for consistent operation under the punishment of off‑road riding and work‑site conditions on both 4x4 and 2x4 KVF360 variants.

Comprehensive Vehicle Fitment

Product Specifications

OEM & Aftermarket Cross-Reference Information

What's Included

This kit ships with the essential components to rebuild the KVF360 piston assembly:

• Piston
•  
• Rings
• Wrist Pin
• Circlips

Note: Gasket set, seals, and other ancillary engine hardware are not included and may be required separately depending on the engine condition.

Why Choose This Aftermarket Replacement?

• Direct-Fit Compatibility: Precisely matched to KVF360 Prairie 360 engines (2003–2010) to ensure smooth installation without modifying other components.
• OEM Cross-Reference: References to Kawasaki OEM piston part numbers provide confidence in lineage and interchangeability for rebuilds.
• Premium Materials: Cast aluminum alloy piston designed for durability under off‑road heat and stresses.
• Accurate Oversize Rebuild: 0.25mm oversize restores bore finish and compression without altering valve timing or head components.
• Performance Restoration: Helps recover lost throttle response, torque, and efficiency after bore wear in KVF360 engines.
• Reliable Aftermarket Support: Backed by aftermarket replacement parts designed for rugged trail and farm use.

Installation Notes:

• Inspect the cylinder bore for scoring and wear; measure bore diameter and check for taper before boresizing to OS 0.25 to ensure proper ring seating.
• Lubricate the piston, rings, and wrist pin with assembly lube before installation to prevent dry startup.
• Check ring end gaps after installation and align rings with the piston’s orientation marks; avoid misalignment that could cause early wear or seizing.
• Install circlips fully seated in their grooves; verify they are locked in place to prevent wrist pin dislodgement during operation.
• Torque fasteners to the engine‑specific specifications when attaching any related components and verify proper head and base gasket seating during reassembly.
• Replace the wrist pin circlips and confirm smooth piston travel through the bore with the conrod by hand before starting the engine.

Why Upgrade?

Running a worn or undersized piston on the KVF360 Prairie 360 can lead to dropped compression, reduced power, and uneven running, especially under load or at high RPMs. Upgrading to this OS 0.25 piston kit restores compression, improves throttle response, and reestablishes reliable combustion characteristics, delivering dependable performance for trail riding and farm work alike.