Namura .040 Over Bore Top End Kit for Yamaha BearTracker 250 1999-2004 72mm

Namura .040 Over Bore Top End Kit for Yamaha BearTracker 250 1999-2004 72mm

This Namura .040 over bore top end kit provides the necessary components to rebuild the upper cylinder of a Yamaha BearTracker 250 from 1999 to 2004, featuring a 72mm bore size.

Overview

The Namura .040 over bore top end kit is a complete set of components designed to restore compression and power in Yamaha BearTracker 250 ATVs from 1999 through 2004. This top end kit includes a piston, rings, wrist pin, and circlips to refresh the cylinder after an overbore operation. It is intended for riders and mechanics performing a top end rebuild on the BearTracker 250 engine.

Built For Performance

• Precision-cast piston for reliable compression
• Includes .040 over bore piston rings for a tight seal
• Heat-treated wrist pin for durability
• Includes all necessary circlips for secure assembly

Fits These Machines

• for Yamaha BearTracker 250 1999-2004

On-The-Job Use

• Trail riding and utility work on ATVs
• Engine rebuilds after wear or damage
• Restoring lost power in older machines

Specs At A Glance

Good To Know

Q: Do I need to re-plate the cylinder? A: This kit is for use after a .040 overbore; if your cylinder is not already bored, you will need to have it machined to 72mm.

Q: Is the kit compatible with the original cylinder head? A: Yes, this top end kit works with the stock cylinder head as long as the head gasket is replaced.

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