Wiseco Forged Series Piston Kit with Gaskets – Yamaha YFM80 – +3.00mm Big Bore

Premium Wiseco Forged Series piston kit for Yamaha YFM80 youth ATV platform. +3.00mm BIG BORE (50.00mm) increases displacement to 90cc!

Big Bore Kit – Cylinder Boring Required

This piston is +3.00mm oversize. Cylinder boring to 50.00mm is required for proper fit.

Kit Includes

• Forged Series Piston
• Ring Set
• Wrist Pin
• Wrist Pin Retainer Set
• Complete Gasket Kit

Piston Specifications

• Bore Size: 50.00 mm (+3.00mm Big Bore)
• Piston Diameter: 49.95 mm
• Stroke Length: 45.60 mm
• Compression Ratio: 11.0:1
• Material: 4032 Aluminum Alloy
• Skirt Coating: Non-Coated

Engine Specifications

• Displacement: 90cc (increased from 80cc)
• Engine Type: 4-Stroke
• Weight: 0.8 lbs

Fitment

• Yamaha YFM80W Raptor: 2002-2008
• Yamaha YFM80 Grizzly: 2005
• Yamaha YFM80 Badger: 1994-2001