Yamaha WR450F service parts: every part number for 2003 to 2026

Every service part and part number for the Yamaha WR450F, the 450cc four-stroke enduro bike, covering model years 2003 to 2026. The numbers come straight from Yamaha’s own parts catalogue, and each one links to the part on our site so you can check it fits and order it.

Part numbers change mid-model more often than people expect, so the year each number covers is given next to it. Check your bike’s model year before you order, and if you are not certain, ring the parts counter on 01570 470 022 with your model and year and we will look it up for you.

Service parts

The consumables: what comes off at a service and goes in the bin.

Service kits

Yamaha sells these as a kit rather than as loose pieces, which is usually cheaper than buying the parts one at a time and means you are not short a seal halfway through the job.

Earlier years

Yamaha’s own service sheets only go back to 2021, so everything before that is read off the exploded diagrams for each model year instead: filters, plug, pads, piston, gaskets, clutch plates, fork seals, chain and sprockets. Where a year lists more than one specification, such as two spark-plug heat ranges, both are shown.