WOSSNER 8179D050 Forged Piston Kit +0.50mm Yamaha YZ250 IT250 DT250

Premium Forged Reliability for Vintage Yamaha 2-Strokes

Bring your classic Yamaha back to its peak performance with the WOSSNER 8179D050 Piston Kit. Engineered specifically for a wide range of vintage 250cc powerhouses—including the YZ250, IT250, and DT250—this forged piston kit is designed to handle the high-heat and high-stress environment of a 2-stroke engine. Unlike standard cast pistons, Wossner uses aerospace-grade aluminum alloy to ensure your engine maintains its integrity during aggressive off-road or adventure touring. Available now at Moto-House MX, this kit is the professional choice for riders who refuse to compromise on top-end quality.

The technical precision of the 8179D050 lies in its optimized weight-to-strength ratio. Each piston features a permanent skirt coating that reduces internal friction and minimizes "piston rock," resulting in a quieter, more efficient engine. The dual-ring design ensures a superior seal against the cylinder wall, maximizing compression and power delivery across the powerband. This +0.50mm oversize kit is precision-machined in key areas like the crown and skirt wall to provide maximum lightness without sacrificing the durability needed for vintage racing or trail riding.

Top Features: WOSSNER 8179D050 Piston Kit

• Forged Aerospace Alloy: Superior strength and heat resistance compared to cast pistons for long-term engine life.
• Permanent Skirt Coating: Reduces friction and wear, providing a quieter operation and improved performance.
• Dual-Ring Precision: High-quality dual-ring setup for maximum compression and efficient heat transfer.
• Optimized Machining: Engineered for lightness to improve throttle response while maintaining structural rigidity.
• Complete Top-End Kit: Includes high-performance forged piston, rings, wrist pin, and circlips.

Expert Pro-Tip

When rebuilding a vintage 2-stroke engine, always check your small-end rod bearing for wear. We recommend replacing the wrist pin bearing alongside this Wossner kit to ensure total top-end reliability.

Fitment List

Year Range	Vehicle Brand	Vehicle Model & Size
1978-1980	Yamaha	IT250
1978-1979	Yamaha	YZ250
1974-1979	Yamaha	DT250
1974-1978	Yamaha	TY250
1973-1975	Yamaha	MX250
1973	Yamaha	DT3 (250cc)
1972	Yamaha	DT2 (250cc)

Frequently Asked Questions

Q: Is this a standard size or oversize piston?
A: This is a +0.50mm oversize piston (70.50mm bore), which requires the cylinder to be bored and honed to the correct clearance.

Q: What are the benefits of the skirt coating?
A: The coating reduces friction during the critical break-in period and throughout the piston's life, preventing scuffing and reducing engine noise.

Q: Does this kit fit the early DT models?
A: Yes, it is specifically designed for the Yamaha DT series from 1972 through 1979 as listed in the fitment guide.

Recommended Pairings: Cometic Top-End Gasket Kits, NGK Spark Plugs, and High-Performance 2-Stroke Oil.

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