This oversize piston ring kit OS 0.75 is designed for 300cc quad engines in the KEF300 Lakota, KLF300 Bayou, and KVF300 Prairie families, spanning model years from 1985 through 2004. The bore is resized to 76.75 mm (0.75 mm over standard) to restore ring seal, improve compression, and recover lost power on worn cylinders. This aftermarket replacement includes the essential compression rings and oil control ring needed for a complete, reliable piston-ring refresh.

When rings wear, you’ll notice reduced compression, diminished throttle response, higher oil consumption, and potential blow-by. This OS 0.75 kit is engineered to renew the seal without sacrificing reliability on trail, field, or utility work, delivering consistent power delivery across the KEF/KLF/KVF 300 variants. Built for durability, it provides a dependable restoration that stands up to the rigors of typical ATV use.

Comprehensive Vehicle Fitment

Fitment details drawn from reputable aftermarket listings confirm compatibility with KEF/KLF/KVF 300 families across the noted years.

Data sources confirm the following cross-model compatibility: KEF300A ( Lakota 1995–2000), KEF300B (Lakota Sport 2001–2003), KLF300A Bayou (1986–1987), KLF300B Bayou 2x4 (1988–2004), KLF300C Bayou 4x4 (1989–2005), KVF300A Prairie 4x4 (1999–2002), and KVF300B Prairie 2x4 (1999–2002).

Product Specifications

Specification data is drawn from aftermarket listings that mirror the OEM references and engine specs for the KEF/KLF/KVF 300-series engines.

OEM & Aftermarket Cross-Reference Information

Cross-reference data reflects OEM part numbers and commonly used aftermarket equivalents for the 300-class engines.

What's Included

This kit is focused on delivering the essential rings for a complete refresh of the piston seal.

• Compression Rings (2 pieces)
• Oil Control Ring (1 piece)

Note: Other gaskets, pistons, or seals are not included in this kit.

Why Choose This Aftermarket Replacement?

• Direct-Fit Compatibility: Precisely matched bore (76.75 mm) and oversize 0.75 mm to restore OEM-like seal and performance on KEF/KLF/KVF 300 platforms.
• OEM Cross-Reference: Aligns with widely used OEM references (e.g., 13008-1111, 13008-1068) for confident future sourcing.
• Premium Materials: High-quality dual-layer rings engineered for durable sealing under heat and load.
• Performance Restoration: Reclaims compression, throttle response, and power delivery compromised by worn rings.
• Wide Model Range Coverage: Supports Bayou, Lakota, and Prairie variants across 1985–2004, simplifying maintenance planning.
• Reliable Aftermarket Quality: Designed to meet or exceed engine standards while delivering long service life in the field.

Installation Notes:

• Clean the cylinder bore and ring grooves thoroughly before installation to avoid scoring or ring sticking.
• Lubricate all rings with clean engine oil or assembly lube before fitting to the piston.
• Install the oil control ring and compression rings in the correct order and orientation; verify ring gaps align with the OEM pattern.
• Use a proper piston-ring expander to seat rings without bending or nicking edges.
• Ensure bore surface is free of debris; wipe with lint-free lint and verify the bore diameter is within spec for the 76.75 mm oversize.
• Stagger the ring gaps per the engine’s standard practice to minimize blow-by and blowout during initial startup.

Why Upgrade?

Running a worn piston-ring set compromises compression, increasing oil consumption and reducing reliability. Upgrading to this OS 0.75 oversize kit restores seal integrity, reclaims lost power, and ensures consistent performance across demanding trail or farm work.