Namura .020 Over Bore Top End Kit for Yamaha Timberwolf 250 1992-2000 71.5mm

Namura .020 Over Bore Top End Kit for Yamaha Timberwolf 250

This .020 over bore top end kit is a complete cylinder and piston assembly for the Yamaha Timberwolf 250 ATV, designed to restore compression and power. It includes a piston, rings, pin, and circlips, with OEM cross-reference numbers that ensure a direct replacement. The 71.5mm bore size provides a dependable overbore option for worn engines.

Overview

This Namura .020 over bore top end kit is a precision-engineered replacement for the Yamaha Timberwolf 250, covering models from 1992 to 2000. It delivers the critical components needed to rebuild the top end and bring an ATV engine back to life, using quality materials and exacting tolerances. The kit includes a piston, rings, wrist pin, and circlips for a complete top-end overhaul.

Built For Performance

• Manufactured from high-silicon aluminum alloy for improved heat dissipation and durability
• Precision-machined piston skirt reduces friction and extends engine life
• Includes moly-coated piston rings for reduced wear and better sealing
• Oversized .020 over bore allows resurfacing of a worn cylinder
• Kit includes all necessary components for a straightforward installation

Fits These Machines

• for Yamaha Timberwolf 250 (1992-2000)

On-The-Job Use

• Commonly used in ATV trail riding and utility work where engine reliability is critical
• Ideal for engine rebuilds after top-end wear or piston seizure
• Works well for farm, ranch, and recreational vehicles that require dependable power

Specs At A Glance

Good To Know

Q: Does this kit include a cylinder? A: No, this is a top end kit including piston, rings, pin, and circlips; the cylinder must be ordered separately or reused if within spec.

Q: Can I install this without machining? A: The cylinder bore must be machined to match the .020 over size; professional installation is recommended.

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