JT Chain Kit 520X1R 14/50 Reinforced - Standard Rear Sprocket for YAMAHA WRF 400, WRF 426, WRF 450 and FANTIC XE 300 1999-2026

JT DRIVE CHAIN offers this chain and sprocket kit for YAMAHA WRF 400, WRF 426, WRF 450 and FANTIC XE 300 1999-2026. The front sprocket, on the gearbox output, drives the chain, which turns the rear sprocket bolted to the rear wheel.

Why replace the whole kit?

The benefits:

• A worn chain damages the teeth and worn teeth damage the chain: replacing all three parts together avoids ruining a new part within a few rides.
• Pitch, tooth counts and chain length are already matched: one order for the whole final drive.
• You can adapt the gearing: more teeth on the rear sprocket (or fewer on the front) gives more acceleration but less top speed; fewer teeth on the rear does the opposite.

When should you replace this part?

Hooked or pointed teeth, a chain that lifts off the back of the rear sprocket when pulled, tight spots or slack that needs adjusting every ride: the kit is worn out.

Specifications and fitting tips

• Front sprocket version: Standard
• Rear sprocket version: Standard
• Rear Sprocket Material: Steel
• Heavy-duty X-ring chain
• Better sealing than conventional O-ring chains
• Manufacturer part number: 484277

Cross-Mania tip: Align the rear wheel (same marks on both sides), tighten the rear sprocket bolts to the specified torque with threadlocker, set the slack to the manual and recheck it after the first ride.

Compatibility

Check the exact model and year of your bike in the list below before ordering.

Fits:
FANTIC XE 300 2026
FANTIC XE 300 2025
FANTIC XE 300 2024
YAMAHA WRF 400 2002
YAMAHA WRF 400 2001
YAMAHA WRF 400 1999
YAMAHA WRF 426 2002
YAMAHA WRF 426 2001
YAMAHA WRF 450 2006
YAMAHA WRF 450 2005
YAMAHA WRF 450 2004
YAMAHA WRF 450 2003