Engine compression and sealing are critical to maintaining power, throttle response, and fuel efficiency on your Honda TRX 300. This OS 0.75 piston ring kit is engineered specifically for Honda TRX 300 models produced from 1988 through 2000, delivering an oversize bore restoration that rebuilds ring seal and restores peak performance. Built for trail work and farm duty, it provides a durable, cost-effective path back to reliable operation without the OEM price tag.

The OS 0.75 kit targets bore wear and ring fatigue that accumulate after years of dusty, hard-use riding. By restoring proper end-gap and seal, this aftermarket replacement reduces blow-by, preserves compression, and revives throttle response. It’s a dependable choice for riders tackling long days on rough trails or demanding farm work, delivering consistent performance when you need it most.

Comprehensive Vehicle Fitment

Product Specifications

OEM & Aftermarket Cross-Reference Information

What's Included

The box contains a complete piston ring set sized for OS 0.75, designed specifically for the Honda TRX 300 1988-2000. The components included are:

• Top Compression Ring
• Second Compression Ring
• Oil Ring Assembly

Why Choose This Aftermarket Replacement?

• Direct-Fit Compatibility: Precisely sized OS 0.75 kit engineered for Honda TRX 300 models from 1988 to 2000.
• OEM Cross-Reference: Designed to align with Honda’s piston ring specifications, with reliable cross-reference options.
• Premium Materials: Built from durable iron alloy to resist wear and maintain a reliable seal under operating temperatures.
• Precision Machining: Tight tolerances ensure proper ring seating and end-gap accuracy for consistent compression.
• Performance Restoration: Restores compression, reduces blow-by, and improves throttle response and efficiency.
• Trail & Farm Reliability: Proven durability in dusty, demanding environments typical of off-road work and extended trail use.

Installation Notes:

• Before assembly, inspect the cylinder bore for wear and measure the bore diameter to verify suitability for an oversize kit; replace or re-bore if out of spec.
• Check ring end gaps with a proper feeler gauge at room temperature; ensure gaps fall within OEM-specified ranges, and adjust only if within your shop’s capabilities.
• Clean all ring lands and grooves thoroughly; remove any burrs or debris that could prevent proper seating.
• Orient rings correctly with the stamped markings facing up; avoid mixing top and second rings during installation.
• Lubricate rings and piston skirts with clean engine oil before installation; keep oils light to prevent ring snag during seating.
• Use a proper ring compressor and a careful, even hand-pressure to seat the rings and oil ring; avoid bending or twisting any ring during installation.

Why Upgrade?

Running a worn piston ring set on a TRX 300 allows blow-by to erode compression, increase oil consumption, and degrade throttle response in dusty, demanding conditions. Replacing with this OS 0.75 kit restores ring seal, returns power, and reestablishes reliable performance for trail riding or farm work. The result is improved longevity, consistent compression, and a more predictable, efficient engine.