This oversize piston ring kit is designed for 300cc KEF, KLF, and KVF engines, including Lakota, Bayou, and Prairie variants produced from 1985 through 2004. The OS +0.25 mm rings renew the top and second rings along with the oil rings to restore compression and sealing, helping return power and reduce oil consumption. It provides a factory-style fit at aftermarket pricing, making it a practical choice for rugged trail riding or farm work. If you’ve noticed thinning power, oil consumption, or increased blow-by, this kit targets those wear-induced issues head-on.

Built as a dependable aftermarket replacement, this kit specifically addresses common wear such as ring land wear, ring-groove scoring, and loss of seal that degrade throttle response and overall reliability in aging 300cc engines. The oversize design ensures precise seating in worn bores, delivering consistent compression and oil control when the engine spends time off-road. Manufactured to strict aftermarket standards and produced with durability in mind, it’s a cost-effective way to keep your engine running strong through demanding trail and farm use.

Comprehensive Vehicle Fitment

Product Specifications

OEM & Aftermarket Cross-Reference Information

What's Included

This kit includes the essential components to rebuild a single piston ring set for KEF/KLF/KVF 300 engines:

• Top Ring
• Second Ring
• Oil Rings (2)
• Oil Ring Spacer

Why Choose This Aftermarket Replacement?

• Direct-Fit Compatibility: Precisely matched to 300cc KEF/KLF/KVF engines (1985–2004) for straightforward installation.
• OEM Cross-Reference: OE reference 192.04614 ensures alignment with Kawasaki specifications while using a cost-effective aftermarket kit.
• Premium Ring Materials: Built from high-quality alloy designed to withstand heat and wear in 4-stroke, compact-cylinder environments.
• Accurate Oversize Option: OS +0.25 mm provides reliable seating in slightly worn bores, restoring compression without oversized interference.
• Reliability for Trails & Farms: Made in Japan to exacting aftermarket standards, delivering consistent performance under demanding conditions.
• Cost-Effective Longevity: Restores compression and oil control without the premium price tag of OEM kits.

Installation Notes:

• Inspect the bore and ring lands: Check for wear, scoring, or out-of-round conditions; replace components if needed before reassembly.
• End-gap verification: Measure and confirm proper ring end gaps; ensure gaps are staggered to avoid continuous bore-gap alignment on startup.
• Lubrication during assembly: Use assembly lube on rings and bore surfaces to prevent dry seating and scuffing.
• Ring orientation and order: Install in the correct sequence—Top Ring, Second Ring, Oil Rings (2) with Spacer—and seat rings fully in their grooves.
• Ring groove cleanliness: Clean grooves thoroughly; any debris can prevent proper seating and sealing.
• Post-install break-in: After assembly, perform a careful break-in procedure to allow rings to seat and seal properly under real load.

Why Upgrade?

Running a worn piston ring set leads to reduced compression, higher oil consumption, and blow-by that robs power and throttle response. Upgrading with this OS +0.25 mm kit restores sealing and compression, delivering reliable, predictable performance for off-road adventures and farm work alike.