Namura Standard Bore Piston Kit for Yamaha Warrior 350 1987-2004 YFM350X 83mm

Namura Standard Bore Piston Kit for Yamaha Warrior 350 1987-2004 YFM350X 83mm

This Namura standard bore piston kit is a direct replacement for Yamaha Warrior 350 ATVs from 1987 to 2004 providing a 83mm bore size to restore compression and performance. The kit includes a cast piston, rings, and wrist pin for a complete top end rebuild for the YFM350X model.

Overview

The Namura standard bore piston kit for Yamaha Warrior 350 is designed to rebuild the top end of your 1987-2004 YFM350X engine. This 83mm piston kit restores cylinder compression and improves engine reliability for off-road use. Each kit contains all necessary components for a straightforward piston replacement for the Yamaha Warrior 350.

Built For Performance

• 83mm standard bore size matches factory specifications for Yamaha Warrior 350
• High-strength cast aluminum piston withstands high RPM and heat
• Precision-machined pin bore ensures proper wrist pin fit
• Includes premium piston rings for consistent compression seal
• Complete kit with wrist pin and circlips for hassle-free installation

Fits These Machines

• for Yamaha Warrior 350 (1987-2004)
• for Yamaha YFM350X (1987-2004)

On-The-Job Use

• Rebuilding the top end of a Yamaha Warrior 350 after wear or piston failure
• Restoring compression and power for trail riding and recreational ATV use
• Replacing worn piston during a full engine overhaul or top end refresh
• Racing or high-performance applications when upgrading to a standard bore replacement

Specs At A Glance

Good To Know

Q: Do I need to hone the cylinder before installing this piston kit? A: Yes, it is recommended to have the cylinder professionally honed or reconditioned to match the new piston for proper ring seating and compression.

Q: What is the break-in procedure for this piston kit? A: After installation, run the engine through several heat cycles with light loads, avoiding sustained high RPM for the first hour to allow the rings to seat correctly.

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