This oversize OS 0.50 piston ring kit is engineered to restore compression in the KVF360 Prairie engine family used in 2003–2012 ATV models. It renews the top, second, and oil rings to reestablish a proper seal between piston and cylinder, reducing blow-by and oil burn-off. By restoring bore size to the OS 0.50 specification, this kit helps reclaim peak power, crisp throttle response, and a smoother idle without the expense of a full top-end rebuild. This aftermarket replacement is designed to be a durable, cost-effective solution for routine trail, farm, and utility use. It targets the wear and heat that degrade ring seating over time, delivering reliable compression restoration and easier cold starts, so your quad can keep up with daily work and weekend chores without downtime.

Comprehensive Vehicle Fitment

Manufacturer	Models / Series	Years / Details
Aftermarket Replacement	KVF360 Prairie (KVF360)	2003–2012 | OS 0.50 oversize variant for bore restoration
Aftermarket Replacement	KVF360 Prairie 4x4	2003–2012 | KVF360 engine family in utility models
Aftermarket Replacement	KVF360C (Prairie reference)	2011 | USA reference variant; uses same KVF360 top-end architecture

Product Specifications

Attribute	Details
OEM Reference Part Numbers	13025-0002 (OS 0.50 oversize); standard bore reference 13008-1214
Type	Piston Ring Kit (3-ring set: top compression ring, second compression ring, oil control ring)
Manufacturer	Aftermarket Replacement
Application	KF360 Prairie / KVF360 engine family, 2003–2012, OS 0.50 oversize bore kit
Bore Size	80.48 mm (0.50 oversize from standard 79.98 mm)
Oversize	0.50 mm
Rings Included	Top compression ring; Second compression ring; Oil control ring

OEM & Aftermarket Cross-Reference Information

Part Number	Brand / Type	Cross-Reference Notes
13025-0002	Kawasaki OEM (OS 0.50)	OS 0.50 piston ring set for KVF360 Prairie 2003–2012; bore enlarged to 80.48 mm
13008-1214	Kawasaki OEM (Standard)	Standard bore piston ring set for KVF360 Prairie 2003–2012; baseline reference

What's Included

The box includes the essential piston ring set for the KVF360 OS 0.50 oversize bore.

• Piston Ring Set (Top Ring, Second Ring, Oil Ring)

Related top-end components such as pistons, wrist pins, circlips, and gasket sets are not included with this kit.

Why Choose This Aftermarket Replacement?

• Direct-Fit Compatibility: Precisely matched to KVF360 Prairie engines from 2003–2012 with OS 0.50 bore specification for reliable seating and compression restoration.
• OEM Cross-Reference: Uses Kawasaki reference numbers 13025-0002 (OS 0.50) and 13008-1214 (standard) to ensure accurate cross-checking with service needs.
• OS Bore Restoration: Restores sealing surface and cylinder bore diameter to restore compression and reduce oil consumption under load.
• Premium Materials (Engineered for Longevity): Built to withstand heat and friction in a high-demand single-cylinder top end, supporting consistent performance over time.
• Performance Restoration: Reclaims throttle response, cold-start reliability, and smooth idle by renewing the ring sealing surface.
• Cost-Effective Maintenance: A targeted fix that avoids a full top-end rebuild while delivering meaningful power and efficiency gains.

Installation Notes:

• Verify bore size and ensure it matches the OS 0.50 specification before installation; use a proper bore gauge and honing as required.
• Thoroughly clean the cylinder bore and piston interact surfaces to remove debris and oil residues prior to ring installation.
• Check ring end gaps with a feeler gauge according to KVF360 service specifications; adjust if necessary within manufacturer tolerances.
• Lubricate all rings and the piston underside with clean engine oil before installation to prevent dry starts.
• Wrap the top, second, and oil rings in the correct orientation; align ring gaps to avoid uniform gaps that can cause blow-by.
• Use a proper ring compressor to seat the rings evenly around the piston during assembly; avoid twisting or bending rings.

Why Upgrade?

Running a worn piston ring set on this engine can allow blow-by, reduce compression, and increase oil consumption, which compromises power and reliability. Replacing with an OS 0.50 piston ring kit restores sealing integrity, improves cold starts, and returns the engine to a more consistent, trail-ready performance without the cost of a full top-end rebuild.