| Size | 77.02mm |
|---|---|
| Product Type | Pistons & Kits |
| Product Group | Engine |
| Catalogue | DIRT |
| Piston Diameter | 77.00 |
| Bore Diameter | |
| Piston Grade | |
| Compression Ratio |
PISTON KIT 14-15 YZF250 77.02, FORGED WOSSNER 8893DC
This Wossner forged piston kit, part number 8893DC, features a 77.02mm bore with an actual piston size of 76.98mm (+0.02mm oversize). Designed for TM MX-F450 (2009–2010), MX-Fi450 (2011), and EN-Fi450 (2011), this German-made piston is engineered for performance with high strength, efficient heat transfer, and balanced load distribution through its elliptical profile, offering a compression increase over OEM specifications.
Features
- Forged construction for strength and durability in performance applications
- Elliptical design supports even thermal expansion and thrust load distribution
- Optimized for efficient combustion heat transfer
- Made in Germany
- Direct OEM replacement
- Easy to install; professional installation recommended if unsure
Specifications
- Bore Size: 77.02mm
- Actual Piston Size: 76.98mm
- Displacement: 249cm³
- Stroke: 53.60mm
- Clearance: 0.05mm
- Dome Volume: -3.00cm³
- Wossner Compression Ratio: 13.70:1
- OEM Compression Ratio: 13.50:1
- Compression Height: 20.20mm
Cross-Reference OEM Part Numbers
- 40116M07700
- CW16 (Lock)
- WP087 (Pin)
- 770XAS-2 (Ring Set)
Vehicle Fitments
- TM MX-F450 (2009–2010)
- TM MX-Fi450 (2011)
- TM EN-Fi450 (2011)
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