Wossner 8094D050 Piston Kit - Polaris Trail Blazer Trail Boss Scrambler 250 +0.50mm Oversize

Wossner 8094D050 Standard Series Forged 2-Stroke Piston Kit - +0.50mm Oversize

Give your classic Polaris ATV a second life with the Wossner 8094D050 Piston Kit. Specifically designed for the air-cooled and liquid-cooled Polaris 250cc 2-stroke engines found in the Trail Blazer, Trail Boss, and Scrambler series, this +0.50mm oversize forged kit is the professional solution for cylinders that require boring to clear up wear or damage. At Moto-House MX, we know these ATVs are legendary for their longevity; Wossner’s aerospace-grade forging provides a massive durability upgrade over the original equipment, ensuring your machine stays on the trail for years to come.

The 8094D050 features a robust dual-ring configuration, which is essential for utility and recreational ATVs. This design provides superior heat dissipation and a long-lasting compression seal, helping your engine stay cool and powerful during extended rides. To ensure smooth operation and reduced engine noise, Wossner applies a permanent molybdenum disulphide skirt coating that minimizes friction and piston rock. Precision-machined for a 72.50mm finished bore, this 72.43mm piston kit restores your Polaris to peak mechanical performance.

Top Features: Wossner 8094D050 Piston Kit

• +0.50mm Oversize (72.43mm): The perfect choice for cylinders that need to be bored out to remove scratches or taper, resulting in a fresh 72.50mm bore.
• Dual Ring Configuration: Offers enhanced cooling and a reliable compression seal, ideal for the heavy-duty demands of an ATV engine.
• Aerospace-Grade Forging: Engineered to be significantly stronger and more heat-resistant than traditional cast pistons.
• Low-Friction Skirt Coating: Permanent skirt treatment reduces internal drag and protects the cylinder wall, ensuring a quieter engine and smoother break-in.
• Optimized Machining: Precisely balanced to reduce reciprocating weight while maintaining maximum strength in the crown and skirt.
• Complete Kit: Includes the high-performance forged oversize piston, rings, wrist pin, and circlips.

Expert Pro-Tip: When moving to an oversize piston like the +0.50mm, it is critical that your cylinder is precision-bored and honed by a qualified machine shop to exactly 72.50mm. This ensures the correct piston-to-wall clearance for a forged assembly. For a professional-grade rebuild, always install with a fresh top-end gasket kit and use high-quality 2-stroke injector or premix oil to protect your new forged piston during the initial heat cycles.

Fitment List

Year Range	Vehicle Brand	Vehicle Model
1990-2005	Polaris	Trail Blazer 250 / ES / Freedom
1985-1999	Polaris	Trail Boss 250 / 2x4 / 4x4 / ES / R
1985-1986	Polaris	Scrambler 250 / 250R ES

Frequently Asked Questions

Q: Why do I need an oversize piston?
A: Over time, 2-stroke cylinders can become oval-shaped or scratched. Boring the cylinder to a +0.50mm oversize and installing this kit allows you to restore a perfectly round bore and factory-spec compression without replacing the entire cylinder.

Q: Is a forged piston better for my older Polaris?
A: Yes. Forged pistons are much more resilient to the heat and stress of air-cooled engines. They offer a higher level of safety against "4-corner seizures" and are generally more durable than the original cast pistons.

Q: Does this kit include the wrist pin bearing?
A: This kit includes the forged piston, rings, wrist pin, and circlips. The small-end needle bearing is sold separately. We always recommend installing a new bearing whenever you replace the piston.

Recommended Pairings

• Complete Top End Gasket Set: Essential for a leak-free seal and proper engine cooling.
• Premium 2-Stroke Oil: Ensure your new oversize forged piston is properly lubricated from the very first start.

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.