Namura Standard Bore Cylinder for Yamaha 2003-2005 YZ450F, 2003-2006 WR450F 95mm

Namura Standard Bore Cylinder for Yamaha YZ450F and WR450F

This Namura standard bore cylinder for Yamaha YZ450F and WR450F is a 95mm replacement piece compatible with 2003-2005 YZ450F and 2003-2006 WR450F models. It is a direct-fit component for top-end rebuilds without oversizing. OEM cross-references are not provided, but fitment is confirmed for these specific years.

Overview

This Namura standard bore cylinder for Yamaha YZ450F and WR450F offers a 95mm bore for 2003-2005 YZ450F and 2003-2006 WR450F machines. It replaces worn OEM cylinders to restore compression and engine performance. This aftermarket cylinder is an economical solution for dirt bike and dual-sport owners.

Built For Performance

• 95mm standard bore size for direct OEM replacement
• Cast from high-strength aluminum alloy with advanced heat treatment
• Precision-honed bore reduces friction and promotes ring sealing
• Ready-to-install without modifications or special tools
• Rigorous quality control ensures dimensional accuracy

Fits These Machines

• for Yamaha YZ450F (2003-2005)
• for Yamaha WR450F (2003-2006)

On-The-Job Use

• Motocross and off-road competition riding
• Trail riding and enduro events
• Engine rebuilding after a catastrophic failure or wear
• Serious DIY mechanics performing top-end overhauls

Specs At A Glance

Good To Know

Q: Can this cylinder be used with a big-bore kit piston? A: This is a standard bore cylinder so it is not compatible with big-bore pistons designed for oversized bores.

Q: What other components should be replaced with this cylinder? A: We recommend new piston, rings, wrist pin, and gaskets for a complete and reliable top-end rebuild.

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