OS 0.25 Piston Kit for Suzuki LTF 400 Eiger and King Quad engines delivers a precise top-end rebuild that restores compression, improves burn efficiency, and returns strong, consistent power for trail rides or farm work. Specifically designed to fit the LTF 400 family from 2003 through 2007 on the Eiger and from 2008 through 2020 on the King Quad, this aftermarket piston kit helps you reclaim factory-like performance without the OEM price tag. When you’re chasing crisper throttle response and steady power delivery, this OS 0.25 kit is a dependable upgrade option for your Suzuki quad.

Built to address the common wear points of a worn LTF 400 top-end—compression loss, ring seating irregularities, and bore wear—this OS 0.25 piston kit provides a reliable path to renewed power and smoother operation in rugged terrain. It’s engineered for straightforward installation and dependable durability, making it a sensible choice for riders who rely on their Eiger or King Quad for weekend trails or demanding farm tasks.

Comprehensive Vehicle Fitment

Product Specifications

OEM & Aftermarket Cross-Reference Information

What's Included

This OS 0.25 piston kit comes with the essential components for a top-end refresh.

• Piston
• Rings
• Piston Pin
• Circlips

Why Choose This Aftermarket Replacement?

• Direct-Fit Compatibility: Precisely sized to restore proper bore clearance on the LTF 400 Eiger and King Quad top-end.
• OEM Cross-Reference Ready: Uses established Suzuki OEM references to ensure correct matching parts when coordinating with other components.
• OS 0.25 Oversize for Bore Restoration: Restores compression and sealing by reclaiming lost bore capacity without oversize risk.
• Top-End Rebuild Ready: Designed for straightforward installation during routine maintenance or rebuilds.
• Engineered for Reliable Power: Aims to restore smooth power delivery and dependable throttle response in rugged conditions.
• Value-Driven Aftermarket: Delivers factory-like performance at a competitive price point compared to OEM alternatives.

Installation Notes:

• Inspect the bore for scoring and ridge height before installation; micrometer measurements may be required to confirm acceptable wear.
• Verify piston orientation; align the arrow marking toward the exhaust side during installation.
• Lubricate the piston, rings, and pin with assembly lube or engine oil before assembly to prevent dry starts.
• Install the piston rings with correct gap orientation and ensure proper seating in the ring grooves to avoid pinch or binding.
• Install the piston pin with the correct locking hardware (circlips) and confirm they are fully seated before reassembly.
• Follow the service manual torque sequence and clearances for the LTF 400 top-end; use OEM-approved gaskets and sealants where required.

Why Upgrade?

Running a worn piston in the LTF 400 can lead to compression loss, reduced power, and uneven combustion, which in turn degrades throttle response and fuel efficiency. This OS 0.25 piston kit restores compression and seals, delivering dependable power you can trust for trails or farm work.