Namura .040 Over Bore Piston Kit for Yamaha Big Bear 250 2007 2008 2009 72mm

Namura .040 Over Bore Piston Kit for Yamaha

This Namura .040 over bore piston kit is designed for Yamaha Big Bear 250 ATVs from 2007 to 2009, featuring a 72mm bore size for reliable engine rebuilds.

Overview

The Namura .040 over bore piston kit provides a direct replacement for Yamaha Big Bear 250 engines, offering precise 72mm bore sizing. This piston kit is ideal for restoring compression and performance in 2007-2009 models. Each kit includes all necessary components for a complete top-end rebuild.

Built For Performance

• Precision-machined from high-silicone aluminum alloy for durability
• .040 over bore size increases displacement for improved power
• Includes premium piston rings for optimal sealing
• Wrist pin and circlips included for complete installation
• Designed to meet or exceed OEM specifications
• Each piston is weight-matched for balanced performance

Fits These Machines

• for Yamaha Big Bear 250 (2007-2009)

Specs At A Glance

Good To Know

Q: Is this piston kit a direct fit for my Yamaha Big Bear 250? A: This kit is designed for 2007-2009 Big Bear 250 models with the stock 72mm bore; confirm your engine's serial number to ensure compatibility.

Q: What should I do after installing the piston kit? A: Follow proper break-in procedures with moderate loads and frequent oil changes to seat the rings and extend engine life.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.