EK/PBR Chain kit 520 SRX2 - 13/51-114 - Alu Standard Rear Sprocket for YAMAHA WRF 250 and FANTIC XEF 250, XEF 310 2020-2027

EK CHAIN offers this chain and sprocket kit for YAMAHA WRF 250 and FANTIC XEF 250, XEF 310 2020-2027. 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
• Use: On/Off-Road
• Connecting link: Pin rivet
• EK Chain Type: SRX2
• Manufacturer part number: 3071489

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 XEF 250 2026
FANTIC XEF 250 2025
FANTIC XEF 250 2024
FANTIC XEF 310 2025
FANTIC XEF 310 2024
YAMAHA WRF 250 2027
YAMAHA WRF 250 2026
YAMAHA WRF 250 2025
YAMAHA WRF 250 2024
YAMAHA WRF 250 2023
YAMAHA WRF 250 2022
YAMAHA WRF 250 2021
YAMAHA WRF 250 2020