Cylinder Works Standard Bore Replacement Cylinder (422-20058 / CW20058) | Yamaha YZ250 (1999-2026)
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High-performance standard bore replacement cylinder engineered to restore factory power and reliability for legendary two-stroke motocross engines. Cast from high-grade aluminum and finished with a durable nickel silicon carbide (NSC) electroplate bore. Diamond honed to exact specifications to ensure optimal ring seal, reduced friction, and superior heat dissipation under aggressive racing conditions.
Specs & Details
- Manufacturer Part Number: 422-20058
- Alternative Part Number: Cylinder Works CW20058
- Component Type: Standard Bore Replacement Cylinder
- Bore Size: Standard (66.40 mm)
- Material & Construction: Cast aluminum with nickel silicon carbide plating
Two-Stroke Vehicle Fitment
| Make | Model | Engine Type | Year Range |
| Yamaha | YZ 250 | Two-Stroke Motocross | 1999–2026 |
| Yamaha | YZ 250X | Two-Stroke Cross-Country | 2016–2026 |
TSO Garage Note
The ultimate go-to solution for refreshing a tired or damaged YZ250 powerplant. Whether you are dealing with deep scoring, high-hour wear, or severe detonation damage, dropping in this nickel silicon carbide-plated cylinder saves you the downtime of a replating service while delivering factory-correct port dimensions and rock-solid reliability for the track or trail.
Compatibility
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