This oversize OS 0.75 piston ring kit is engineered to restore compression and oil control for your 400cc Suzuki quad engine. It is designed to fit a broad range of Suzuki 400-class platforms produced from 2002 through 2017, covering the Eiger and KingQuad families. Replacing worn rings with this OS 0.75 kit helps recover power, crisp throttle response, and reliable oil control during trail runs or farm duty. As an aftermarket replacement, it delivers factory-like tolerances and durability at a cost-effective price.

This OS 0.75 oversize piston ring kit targets bore wear and ring-seal fatigue that creep up with high mileage. By restoring the bore seal and preventing oil blow-by, it helps reduce oil consumption and smoke, while keeping combustion more efficient under tough operating conditions. It's a practical, trail-proven choice for rebuilds and frequent use in rugged environments, offering dependable performance without the premium price of OEM parts.

Comprehensive Vehicle Fitment

Product Specifications

OEM & Aftermarket Cross-Reference Information

*OEM cross-reference numbers are provided for reference purposes only. Always verify fitment using your machine's exact model, year, and original part number before ordering. The OS 0.75 variant will use a different OEM cross-number than standard kits.*

What's Included

This kit includes:

• Piston Rings OS 0.75 (Top Ring, Second Ring, and Oil Ring Set as a complete unit per cylinder)

Note: Piston, wrist pin, circlips, and gaskets are not included in this kit.

Why Choose This Aftermarket Replacement?

• Direct-Fit Compatibility: Verified for 400cc Eiger and KingQuad family models from 2002–2017, ensuring straightforward installation.

• OEM Cross-Reference: Clearly aligned with Suzuki sizing conventions (referencing OEM 12140-38F21-075) to help you compare with OEM specifications while offering a cost-friendly alternative.

• Oversize 0.75 Performance: Specifically chosen to restore ring seal in worn bores without sacrificing tolerances, supporting consistent compression.

• Compression & Oil Control Restored: Rebuilds bore seal and prevents excessive oil blow-by, improving combustion and reducing blue smoke on rugged duties.

• Economical Reliability: A budget-friendly option that delivers factory-like tolerances and dependable performance for trail and farm use.

• Built for Field Duty: Designed to endure the dirt, dust, and vibration of off-road and working environments where wear accelerates.

Installation Notes:

• Verify Bore Size: Confirm the cylinder has been professionally overbored to a final size of 82.00 mm (from a standard 81.00mm) before installing these OS 0.75 rings.

• Clean Surfaces Thoroughly: Debris in the bore or ring lands will prevent proper sealing. Clean pistons, rings, and the cylinder with lint-free solvent and compressed air.

• Lubricate During Assembly: Apply assembly lube or light engine oil to all rings and moving surfaces before installation.

• Ring Orientation and Gaps: Install rings with correct orientation and stagger end gaps to reduce blow-by; keep gaps offset from the piston skirt and thrust faces.

• Handle Rings Carefully: Avoid bending or twisting the rings; use appropriate ring pliers or careful hand placement to seat rings evenly.

• Check Ring End Gap: Always check and adjust ring end gaps according to the service manual specifications for the 82.00mm bore.

• Break‑In Considerations: After assembly, follow a light break‑in procedure to seat the new rings and establish a proper seal before heavy work duty.

Why Upgrade?

Worn piston rings on a 400cc quad can lead to noticeable compression loss, reduced power, and increased oil consumption, especially under load on trails or in heavy farm work. Replacing with this OS 0.75 kit restores ring seal and oil control, renewing reliable power and smooth operation while preserving long-term engine health.

Order your piston ring kit today and get back on the trail with confidence.