Piston ring kit for the TRX 350 single‑cylinder engines used in FM/TM/FE/TE models from 2000 through 2006, this OS 0.50 oversize set is engineered to restore compression and seal before you head back to rugged trails or demanding farm work. The kit includes the top ring, second ring, and oil ring, and carries OEM cross‑reference numbers 13012-HN5-671 and 13012-HN5-672 to ensure an exact aftermarket match. With chrome‑faced rings designed for durability, this replacement helps reclaim power, reduces oil consumption, and fights blow‑by when the going gets tough. Precision manufacturing in Japan backs every rebuild to stand up to real‑world wear.

When ring wear sets in, compression falls, oil rings can drag oil into the combustion chamber, and throttle response fades. This OS 0.50 oversize kit is designed to seal the top end again, delivering consistent power delivery and reliable performance for trail riding or farm tasks. It provides a trusted, aftermarket option that maintains engine reliability under harsh conditions where you depend on every RPM.

Comprehensive Vehicle Fitment

Product Specifications

OEM & Aftermarket Cross-Reference Information

What's Included

This kit includes the essential rings you need to rebuild the top end for a single-cylinder TRX 350 engine: Top Ring, Second Ring, Oil Ring.

• Top Ring
• Second Ring
• Oil Ring

Wrist pin, circlips, and gasket set are not included with this piston ring kit.

Why Choose This Aftermarket Replacement?

• Direct-Fit Compatibility — precisely matched to TRX 350 FM/TM/FE/TE models from 2000–2006 with OS 0.50 applications.
• OEM Cross-Reference — validated cross-references to established brands ensure reliable replacement parts and ongoing availability.
• Premium Materials — chrome-faced rings built to resist wear and maintain sealing performance under tough conditions.
• Accurate Oversize Sealing — +0.50 mm oversize rings restore bore sealing and throttle response for consistent power delivery.
• Made in Japan Quality Control — stringent manufacturing standards support long-term durability in the field.
• Performance Restoration — addresses typical top-end wear to revive compression, reduce oil consumption, and minimize blow-by on rugged terrains.

Installation Notes:

• Inspect the cylinder bore and ring grooves for scoring or debris; clean thoroughly before ring installation.
• Lubricate all rings and the sliding surfaces with clean engine oil prior to assembly to prevent dry friction.
• Install the rings in their correct orientation; pay attention to any marks or bevels indicated by the packaging or OEM references.
• Use a proper ring compressor and ensure even compression around the ring gaps to avoid pinching or edge damage.
• Stagger ring end gaps across the bore to minimize blow-by; avoid aligning gaps with the same vertical plane.
• Follow a careful break-in procedure after installation to allow the new rings to seat properly and achieve optimal sealing.

Why Upgrade?

Running a worn top-end ring set on these TRX 350 engines invites reduced compression, increased blow-by, and higher oil consumption, which dulls throttle response and muds torque on demanding terrain. Replacing with this OS 0.50 oversize kit restores sealing and power, delivering reliable performance for trail duty and farm work alike.