Restore peak engine breathing and reliable power on your 500cc Foreman with an oversize piston ring kit engineered for the FA, FE, FM family and the FPE/FPM variants. This aftermarket replacement targets worn compression rings and oil rings to curb blow-by, restore compression, and improve oil control for trail duty or farm work. With a +0.50 mm oversize and a 92.00 mm bore, this set helps bring back crisp throttle response and consistent performance under load.

Designed to withstand the rigors of rugged terrain, this kit focuses on the wear points that erode reliability: rings that lose seal, oil burning, and end-gap growth that allows pressure to slip by. Built as a cost-conscious, durable alternative to OEM pricing, it delivers solid fitment and enduring sealing performance, making it a trusted choice for back‑country rides and field work alike.

Comprehensive Vehicle Fitment

Fitment notes based on model family and bore specifications align with a 92.00 mm bore and OS 0.50 oversize used on these Foreman variants. Sources reflect the 92 mm bore dimension that underpins this oversize ring kit’s compatibility.

Product Specifications

Notes: OS 0.50 oversize corresponds to a 92.00 mm bore with the appropriate end-gap and seating. These material details align with common aftermarket ring-set compositions used for this bore/oversize configuration.

OEM & Aftermarket Cross-Reference Information

Cross-reference details reflect OEM and aftermarket alignment for the TRX500 Foreman 0.50 OS kits. For example, the aftermarket reference 13010-HP0-A01 is indicated as a compatible cross-reference in aftermarket catalogs.

What's Included

This kit provides the essential piston ring components needed to restore compression on the Honda TRX500 Foreman with OS 0.50 oversize.

• Top compression ring
• Second compression ring
• Oil ring assembly
• Rings sized for 92.00 mm bore OS 0.50

Note: Piston, wrist pin, circlips, gaskets, and other related components are not included in this kit.

Why Choose This Aftermarket Replacement?

• Direct-Fit Compatibility: Specifically engineered for the TRX500 Foreman FA/FE/FM and the FPE/FPM variants with OS 0.50, enabling straightforward installation and a proper seal.
• OEM Cross-Reference: Uses the OEM reference framework while delivering a cost-effective aftermarket alternative for budget-conscious builds.
• Premium Materials for Durability: Engineered to withstand high cylinder pressures and heat, helping maintain compression under rugged conditions.
• Performance Restoration: Rebuilds effective sealing, reducing blow-by and restoring consistent power delivery under load.
• Value-Driven Choice: A reliable upgrade that delivers OEM-like performance at a lower price point without sacrificing fit.
• Industry-Grade Fitment: Designed to align with standard bore spec (92.00 mm) for a dependable ring seal and long service life.

Installation Notes:

• Measure bore before install: Confirm a 92.00 mm bore and OS +0.50 mm oversize to ensure correct ring end-gap and seating.
• Check end gaps: Verify the ring end gaps to match OS 0.50 specifications; adjust with proper shims or honing if needed.
• Clean and inspect grooves: Thoroughly clean piston grooves and ring lands; remove rust, carbon, and debris to ensure proper seating.
• Lubricate rings and bore: Lightly oil each ring and the bore surfaces before assembly and use assembly lube where recommended.
• Ring orientation: Install in the correct orientation (top ring marking facing up) and maintain correct order: top compression ring, second compression ring, then oil ring.
• Seat and break-in: After installation, follow a proper break-in procedure to allow rings to settle and seal evenly.

Why Upgrade?

Worn piston rings lose sealing capability, increasing oil blow-by, accelerating oil consumption, and dropping compression. Replacing with this OS 0.50 ring kit restores cylinder seal, reduces oil burn, and returns the Foreman’s performance to its intended power and efficiency.