71.75mm Piston Ring Set Compatible with 1992-2009 Yamaha Timberwolf Bear Tracker Bruin Big Bear 250 229cc SOHC Single Cylinder 0.75mm Over 4BD-11631-00-Y0

Piston Ring Set - 71.75mm (0.75mm Over) Compatible with Yamaha 250 Utility ATVs
Aftermarket piston ring set for the Yamaha 229cc utility ATV engine platform. Bored 0.75mm over standard 71.00mm bore for a total diameter of 71.75mm. Designed for the 229cc air-cooled SOHC 4-stroke single-cylinder engine with 71mm x 58mm bore and stroke and 8.7:1 compression ratio. This engine platform powers multiple Yamaha 250cc utility ATV models produced from 1992-2009 including the Timberwolf, Bear Tracker, Bruin, and Big Bear 250. Carburetor equipped with Mikuni VM24SH. Includes compression rings and oil control ring for complete piston ring replacement.

OEM PART NUMBERS:
• 4BD-11631-00-Y0 (Piston Ring Set)

SPECIFICATIONS:
• Bore Size: 71.75mm (0.75mm Over)
• Standard Bore: 71.00mm
• Stroke: 58.0mm
• Displacement: 229cc
• Engine Type: Air-Cooled SOHC 4-Stroke Single Cylinder
• Compression Ratio: 8.7:1
• Fuel System: Mikuni VM24SH Carburetor
• Product Type: Piston Ring Set

APPLICATIONS:
• YFB250 Timberwolf 2x4 (1992-2000)
• YFB250FW Timberwolf 4x4 (1994-2000)
• YFM250X Bear Tracker 2x4 (1999-2004)
• YFM250B Bruin 250 2x4 (2005-2006)
• YFM250B Big Bear 250 2x4 (2007-2009)

⚠️ Verify OEM part number from your original unit before ordering.