WOSSNER 8175D100 Forged Piston Kit +1.00mm Yamaha YTZ250 IT250 2-Stroke

High-Performance Forged Power for Vintage Yamaha 2-Strokes

Restore the heart of your engine with the precision engineering of the WOSSNER 8175D100 Piston Kit. Designed specifically for the legendary Yamaha YTZ250 Tri-Z and IT250, this kit is the ultimate solution for riders looking to regain lost compression and improve throttle response. Wossner pistons are forged from aerospace-grade aluminum alloy, offering superior strength-to-weight ratios compared to cast alternatives. Whether you are hitting the trails or restoring a classic, this kit from Moto-House MX ensures your 2-stroke runs cooler, quieter, and more reliably than ever before.

Technical excellence is built into every cross-section of this forged piston. The 8175D100 features a high-quality, permanent skirt coating that significantly reduces friction and piston rock, resulting in a quieter engine and extended cylinder life. Optimized machining ensures maximum lightness for rapid RPM gains without compromising the structural integrity of the crown or skirt walls. This dual-ring, +1.00mm oversize kit comes complete with the piston, high-tension rings, pin, and clips, providing everything you need for a professional-grade top-end rebuild.

Top Features: WOSSNER 8175D100 Piston Kit

• Aerospace-Grade Forging: Forged from premium aluminum alloy for maximum durability under high-heat 2-stroke conditions.
• Permanent Skirt Coating: Reduces friction and internal wear for improved performance and a quieter engine.
• Optimized Lightness: Precision-machined to shed weight while maintaining critical strength in the crown and walls.
• Dual-Ring Design: Provides superior sealing and heat transfer for consistent power throughout the RPM range.
• Complete Rebuild Kit: Includes forged piston, rings, wrist pin, and circlips for a seamless installation.

Expert Pro-Tip

When installing a +1.00mm oversize piston, always verify your cylinder bore clearance and ensure the ring end gap is set to Wossner's specific tolerances to prevent seizure during the initial heat cycle.

Fitment List

Year Range	Vehicle Brand	Vehicle Model & Size
1985-1986	Yamaha	YTZ250 Tri-Z
1983	Yamaha	IT250

Frequently Asked Questions

Q: Is this piston an oversize or standard replacement?
A: This is a +1.00mm oversize piston (69.00mm bore), requiring your cylinder to be bored to match.

Q: Why is a forged piston better than a cast one?
A: Forged pistons are denser and stronger, making them much more resistant to cracking or shattering under high-performance 2-stroke stress.

Q: Does the skirt coating wear off quickly?
A: No, Wossner uses a permanent coating process designed to last the life of the piston to maintain reduced friction levels.

Recommended Pairings: Top-End Gasket Kits, 2-Stroke Premix Oil, and Spark Plugs.

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Moto-House MX – Choice of Champions – is located in Clermont/Montverde, FL. The Best Motocross/UTV & ATV Shop in Central Florida.