WOSSNER 8179D200 Forged Piston Kit +2.00mm Yamaha YZ250 IT250 DT250

Maximum Displacement for Vintage Yamaha 2-Stroke Rebuilds

When your classic Yamaha cylinder has reached its limit, the WOSSNER 8179D200 Piston Kit provides the ultimate solution for a high-performance overbore. Designed specifically for the legendary 250cc line—including the YZ250, IT250, and DT250—this +2.00mm oversize kit allows you to save a worn cylinder and gain a bump in displacement. Forged from aerospace-grade aluminum alloy, Wossner pistons offer a level of structural integrity and heat resistance that standard cast pistons simply cannot match. Pick up this professional-grade kit at Moto-House MX and restore the compression your vintage machine deserves.

The technical engineering behind the 8179D200 focuses on reducing engine noise and increasing longevity. Each forged piston features a permanent skirt coating that minimizes friction and prevents "piston rock," a common issue in older 2-stroke engines. The dual-ring design ensures a perfect seal against the 72.00mm bore, maximizing torque and power delivery across the entire RPM range. Precision-machined for lightness without compromising strength in the crown or skirt walls, this kit allows for rapid throttle response while maintaining the durability needed for rugged off-road and adventure touring.

Top Features: WOSSNER 8179D200 Piston Kit

• Aerospace Forged Alloy: Superior strength-to-weight ratio designed to withstand the high-heat cycles of 2-stroke racing.
• +2.00mm Oversize (72.00mm): Ideal for restoring cylinders with significant wear or damage beyond standard sizes.
• Permanent Skirt Coating: Advanced dry-lubricant coating reduces internal friction and wear for a quieter top end.
• Dual-Ring Sealing: Provides consistent compression and improved heat dissipation for reliable power.
• Complete Precision Kit: Includes the forged piston, high-tension rings, wrist pin, and circlips for a full rebuild.

Expert Pro-Tip

Because a +2.00mm overbore significantly changes the engine's volume, we recommend checking your spark plug color after the first few rides to ensure your air/fuel mixture is correctly jetted for the increased displacement.

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: How much does this increase my displacement?
A: This +2.00mm oversize (72.00mm bore) increases the standard 246cc displacement to approximately 260cc, providing a noticeable boost in torque.

Q: Does this kit require special rings?
A: The kit comes with specific Wossner +2.00mm rings; always use the rings provided to ensure correct tension and sealing.

Q: Is the wrist pin included?
A: Yes, every Wossner kit at Moto-House MX includes the piston, rings, wrist pin, and circlips.

Recommended Pairings: Top-End Gasket Kits, 2-Stroke Premix Oil, and New Wrist Pin Bearings.

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