Restore peak compression and dependable power with this Piston Kit OS 0.50 (66.5mm bore) designed for Suzuki LT230 and LT250 engines. Specifically sized for the LT230 (1985–2002) and LT250 (1985–2014) platforms, this kit brings OEM-style performance at a portion of the cost. The precise 66.5mm bore ensures a true seal, smooth operation, and reliable cold-starts, so your quad still feels strong on trails and jobs alike.

Engineered as a cost-effective aftermarket replacement, this OS oversize kit targets the common wear-and-tear that dulls throttle response and compression over time. With a +0.50mm oversize to restore bore condition, it supports consistent ring seal and combustion efficiency, making it a trustworthy choice for trail-riding and hard-working farm use where reliability matters most.

Comprehensive Vehicle Fitment

Fitment data reflects the LT230 and LT250 engine family as outlined in OEM cross-reference details and catalog listings for this oversize piston kit. These ranges align with common LT230/LT250 rebuild applications across the model years referenced above.

Product Specifications

Key specifications surface from OEM cross-references and aftermarket listings, including the 66.50mm bore with +0.50mm oversize, cast aluminum alloy construction, and displacement guidance for the LT230/LT250 family.

OEM & Aftermarket Cross-Reference Information

These cross-references reflect official Suzuki part numbers and common aftermarket cross-refs used to identify compatible piston kits for LT230/LT250 engines.

What's Included

This kit includes the core components needed to refresh the top end on LT230/LT250 engines. In the box you’ll find:

• Piston
• Rings
• Wrist Pin
• Circlips

Note: Gaskets and other top-end components are not included in this piston kit.

Why Choose This Aftermarket Replacement?

• Direct-Fit Compatibility: Precisely sized 66.50mm bore with oversize +0.50mm to restore full sealing surface on LT230/LT250 platforms.
• OEM Cross-Reference: Uses established OEM references (12103-18830-050 and 12111-18A04-050) to ensure accurate fitment when shopping across brands.
• Premium Materials: Cast aluminum alloy piston designed for reliable heat tolerance and wear resistance in air-cooled engines.
• Complete Kit for Longevity: Includes piston, rings, wrist pin, and circlips for a complete top-end refresh.
• Performance Restoration: Restores compression and throttle response after bore wear, helping your LT230/LT250 regain original torque and pull on trails or farms.
• Cost-Effective Alternative: Delivers OEM-style performance without OEM price, making it a practical choice for vehicles in steady use or restoration projects.

Installation Notes:

• Thoroughly inspect the cylinder bore for wear or scoring; hone or re-machine if needed to achieve proper ring seating and end-gap integrity.
• Install piston rings with correct orientation and stagger ring gaps to avoid alignment with piston scoops; ensure end gaps are within spec (refer to service manual for your LT230/LT250 variant).
• Lubricate the piston and rings with assembly oil or engine oil before installation to prevent dry startup.
• Secure the wrist pin with the included circlips, making sure there is proper side-side clearance and no clip exposure beyond the bore.
• Check ring end gaps and verify piston orientation marks before sliding the piston into the bore; rotate the crank to confirm smooth movement with no binding.
• Re-torque or verify torque specs for any attached components when completing the top-end refresh, and ensure correct valve and cam timing if you’re performing a broader head work.

Why Upgrade?

Running a worn piston compromises compression, reduces power, and increases oil consumption, especially on older LT230 and LT250 engines. This OS oversize replacement restores the necessary seal and clearance, delivering reliable compression and predictable power delivery once more, so you can trust your quad on rugged trails or demanding farm work.