Upgrade and reclaim lost power with this oversize OS 1.00 piston kit, designed specifically for the LTF 400 family in Eiger and KingQuad platforms. The +1.00 bore increase restores compression and displacement, delivering crisper throttle response and stronger mid-range punch after years of wear or bore repair. This aftermarket replacement is engineered to meet the engine’s tolerances and support reliable operation across the Eiger and KingQuad 400cc engines. Suitable for use after honing or bore repair to achieve the OS +1.00 specification, it ensures proper ring seal and consistent performance on both Eiger and KingQuad models.

Beyond simply replacing a worn piston, this OS 1.00 kit targets the core wear points that sap power on rugged trails and tough farm work. Expect improved compression, reduced oil blow-by, and steadier heat management thanks to a hypereutectic aluminum piston with MOS2-coated skirts. The kit is a complete top-end rebuild solution, designed for straightforward installation and long-term reliability in demanding conditions.

Comprehensive Vehicle Fitment

Product Specifications

OEM & Aftermarket Cross-Reference Information

What's Included

This OS +1.00 piston kit ships with everything you need to complete the top-end rebuild.

• Piston
• Rings
• Wrist Pin
• Circlips

Gaskets and related seals are not included; a separate gasket set is typically required for installation and should be selected based on your engine configuration.

Why Choose This Aftermarket Replacement?

• Direct-Fit Compatibility: Precisely sized for OS +1.00 bore applications on the LTF/LT-F 400 family, simplifying top-end rebuilds.
• OEM Cross-Reference: Backed by established Suzuki cross-references to ensure correct application and dealer compatibility.
• Premium Materials: Hypereutectic aluminum piston with MOS2-coated skirts for reduced friction and longer life.
• Performance Restoration: Restores displacement and compression to reclaim lost power and throttle feel on trails and farms.
• Reliability in Tough Conditions: Engineered to withstand heat and wear from off-road duty in Eiger and KingQuad platforms.
• Cost-Effective Alternative: A practical, affordable option that maintains factory-like performance without OEM pricing.

Installation Notes:

• Verify bore condition and confirm the required oversize (+1.00 mm) with your rebuild spec before ordering.
• Measure ring-end gaps and ensure they are within manufacturer tolerances; improper gaps can cause compression loss or scuffing.
• Orient the piston correctly according to any arrow markings and ensure the rings are installed in the correct locations (especially top and second rings).
• Lubricate the piston, rings, and wrist pin with assembly lube before assembly to prevent dry starts.
• Install the circlips securely with the appropriate pliers; check for complete retention before reinstalling the cylinder head.
• Follow a proper break-in procedure after assembly to promote even ring seating and piston wear patterns.

Why Upgrade?

Running a worn or under-spec piston in an OS +1.00 bore setup risks continued compression loss, accelerated wear, and potential heat-related damage under heavy use. This replacement restores displacement and compression, delivering dependable power and throttle response once again for reliable trail and farm performance.