Wiseco Top-End Rebuild Kit for Yamaha YFM400 / YFM400F - 84.00mm - PK1779

Wiseco Performance Top End Rebuild Kit

Part Number: PK1779 
Piston Size: 83.50mm

• These kits contain everything you need to complete your rebuild the right way, the first time
• High Performance ring kit and alloy pin included with each piston kit for extended life and sustained power.
• Dedicated forgings used for superior strength to weight ratio utilizing aerospace alloy.
• All Piston Kits are precision crafted and forged in the USA

Wiseco's complete Top-End Piston Kits are offered for nearly every popular application in the powersports market. These kits contain everything you need to complete your rebuild the right way, the first time. High quality parts specifically chosen by us to match our forged pistons are included in this kit for easy one stop shopping. 2-stroke kits feature our Pro-Lite pistons that are CNC machined for optimal cam shape and profile for peak HP and service life. 4-stroke kits feature a ‘race-ready’ dome finish with smooth edges for improved combustion flow. Horizontal slot-pin oiling reduces friction and provides scuff resistance, along with a pressure seal groove for maximum ring seal. 4-stroke race applications feature Wiseco’s Armor Glide skirt coating to provide reduced friction and noise to contribute to increased horsepower. Each piston is built from race proven designs that are chosen by the top race teams in all forms of racing including Super-cross, Motocross, GNCC, Super-bike, and more.

Fits:
2000-05 Yamaha YFM400 Big Bear
1993-99 Yamaha YFM400F Kodiak

• Displacement: 389cc
• Piston Standard Bore: 83.00mm
• Oversize Bore: 0.50mm
• Stroke: 71.50mm
• Compression Ratio: 8.6 : 1