Wossner 8127DA Piston Kit - 1985-1986 Honda CR125R Standard Size A

Wossner 8127DA Standard Series Forged 2-Stroke Piston Kit - Standard Size A

Revitalize your vintage Honda motocross machine with the Wossner 8127DA Piston Kit. Engineered specifically for the 1985-1986 Honda CR125R, this "Size A" forged kit is the premium choice for riders performing a top-end refresh on stock 54.00mm bores. At Moto-House MX, we understand the importance of maintaining classic 2-strokes; Wossner’s aerospace-grade forging provides a significant strength and durability upgrade over original cast pistons, ensuring your CR125R remains competitive and reliable on the track.

The 8127DA features a dual-ring configuration, which offers superior heat dissipation and a more consistent compression seal compared to single-ring race setups. This is particularly beneficial for the high-revving nature of the 125cc power plant, helping to extend engine life and maintain peak performance. To ensure a quiet engine and smooth operation, Wossner applies a permanent molybdenum disulphide skirt coating that reduces friction and prevents piston rock. Precision-machined for 54.00mm bores, this 53.94mm piston kit provides the exact tolerances required for a professional-grade rebuild.

Top Features: Wossner 8127DA Piston Kit

• Standard Size A (53.94mm): Precision-engineered for stock 54.00mm bores to restore factory-spec mechanical clearances.
• Dual Ring Configuration: Provides enhanced cooling and a superior long-term compression seal, ideal for the high-RPM demands of 125cc motocross engines.
• Aerospace-Grade Forging: Manufactured to be significantly stronger and more heat-resilient than traditional cast alternatives.
• Low-Friction Skirt Coating: Permanent skirt treatment minimizes drag, protects the cylinder wall, and ensures a smoother break-in period.
• Optimized Machining: Precisely engineered to reduce reciprocating mass without compromising the structural integrity of the crown or skirt.
• Complete Kit: Includes the high-performance forged Size A piston, rings, wrist pin, and circlips.

Expert Pro-Tip: For a high-performance machine like the CR125R, accuracy is everything. The Size A (53.94mm) piston is designed for a standard 54.00mm bore. We strongly recommend having your cylinder measured with a precision bore gauge before installation to confirm it is within factory limits. For the best results, always install with a fresh top-end gasket kit and utilize high-quality 2-stroke oil to protect your new forged assembly during the critical initial heat cycles.

Fitment List

Year Range	Vehicle Brand	Vehicle Model
1985-1986	Honda	CR125R

Frequently Asked Questions

Q: Why should I choose a forged Wossner piston for my vintage CR125R?
A: Forged pistons are created through a process that makes the metal denser and stronger than cast pistons. This allows them to better withstand the intense heat and pressure of a high-revving 125cc race engine, reducing the risk of piston failure.

Q: What is the benefit of the dual ring design on a 125?
A: While some race pistons use a single ring to reduce friction, a dual-ring design like this one transfers heat more efficiently from the piston to the cylinder wall. This helps prevent overheating and maintains better compression over a longer period of time.

Q: Is this kit ready for installation?
A: This kit includes the forged piston, dual rings, wrist pin, and circlips. You will need to purchase a small-end needle bearing and a top-end gasket set separately to complete your engine overhaul.

Recommended Pairings

• Complete Top End Gasket Set: Vital for ensuring a leak-free rebuild and maintaining correct engine compression.
• High-Performance 2-Stroke Premix Oil: Keep your high-revving engine lubricated and protected during aggressive motocross riding.

Restore your machine’s power and precision 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.