Wossner 8869D050 Piston Kit - Honda TRX420 Rancher 420 (+0.50mm)

Wossner 8869D050 Pro Series Forged 4-Stroke Piston Kit - +0.50mm Oversize

Restore the legendary reliability of your Honda Rancher with the Wossner 8869D050 Piston Kit. This +0.50mm oversize forged kit is specifically engineered for the Honda TRX420 series, providing a high-performance solution for engines requiring a cylinder bore refresh. At Moto-House MX, we know the Rancher 420 is a staple for both utility work and trail riding; Wossner’s Pro Series components ensure your ATV maintains "Factory Quality" power and durability for years to come.

Forged from aerospace-grade aluminum alloy, this piston is significantly stronger than a standard cast replacement. The Pro Series design features enhanced piston pin oiling slots and radial boss machining to ensure the wrist pin stays lubricated under heavy loads. With a 10.0:1 compression ratio and a permanent skirt coating to reduce friction, this kit provides a quieter-running engine and a more efficient break-in period, even in the most demanding off-road conditions.

Top Features: Wossner 8869D050 Piston Kit

• Oversize +0.50mm (86.95mm Piston): Designed for 87.00mm bores, perfect for cleaning up worn cylinders and restoring compression.
• Pro Series Forged Construction: Aerospace aluminum alloy provides superior structural integrity and heat resistance compared to cast pistons.
• Advanced Lubrication: Radial boss machining and annular grooves deliver consistent oil flow to the wrist pin.
• Low-Friction Skirt Coating: Permanent coating reduces piston rock and internal drag for smoother engine operation.
• Precision Ring Seal: Specialized ring land treatment improves oil control and minimizes combustion blow-by.
• Complete Assembly: Kit includes the forged piston, high-performance rings, wrist pin, and pin locks.

Expert Pro-Tip: The Honda TRX420 engine is known for its durability, but over time, utility use can lead to cylinder wear. This +0.50mm kit is the professional choice for an engine rebuild that requires a fresh bore and hone. Always verify your machinist matches the cylinder bore to this 86.95mm piston to ensure the correct piston-to-wall clearance for a long-lasting engine life.

Fitment Guide

Model Group	Year Range	Specific Models
Honda TRX420 Rancher (All)	2014-2025	FM1, FE1, TE1, TM1, FA1/2/5/6, NorthStar
Honda TRX420 Rancher (EFI/AT)	2007-2014	FM, FE, TE, TM, FPA, FPE, FPM

Frequently Asked Questions

Q: Is this a Standard Size piston?
A: No, this is an Oversize (+0.50mm) piston. Your cylinder must be bored and honed to 87.00mm to accommodate this kit.

Q: Does this kit include a top-end gasket set?
A: No, the kit includes the piston, rings, wrist pin, and pin locks. A complete top-end gasket set is required for a leak-free rebuild and is sold separately.

Q: Why upgrade to a forged piston for a utility ATV?
A: Forged pistons are much stronger and better at dissipating heat than cast pistons. For a machine like the Rancher that often handles heavy towing or slow technical trails, a forged piston provides a higher margin of safety against engine failure.

Recommended Pairings

• Complete Top End Gasket Set: Ensure a professional, leak-free seal during your rebuild.
• High-Performance 4-Stroke Oil: Protect your new forged piston with premium lubrication designed for ATV engines.

Restore your Honda Rancher’s performance today. Buy now at Moto-House MX!

Moto-House MX – Choice of Champions – is located in Clermont/Montverde, FL. The Best Motocross/UTV & ATV Shop in Central Florida. Stop by our local store in Montverde, FL or enjoy lightning-fast shipping across the USA.