Forged piston kit Wossner for Yamaha YFM 250 Timberwolf (1990-2000) / YFB 250 Bear Tracker (2000-2004) / Bruin 250 (2005-2006) / Big Bear 250 (2007-2009).
The kit includes piston, rings, pin, and clips.
Please select the piston size from the box above.
Technical specifications:
- cylinder diameter: 71.00mm
- thermal clearance: 0.06mm
- number of rings: 3 (two compression / one oil)
- compression ratio: 9.50:1 (OEM)
- pin-to-head distance (measured from the center of the pin): 23.80mm
- piston pin dimensions: 16x10.5x51mm.
Available piston sizes:
- standard (70.94 mm)
- +0.50 mm
- +1.00 mm
- +1.50 mm
- +2.00 mm.
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