EK/PBR Chain kit 520 MRD7 - 14/51-118 - Steel Standard Rear Sprocket for KTM SXF 250, GAS GAS MCF 250 and HUSQVARNA FC 250

EK CHAIN offers this chain and sprocket kit for KTM SXF 250, GAS GAS MCF 250 and HUSQVARNA FC 250 2017-2025. 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: Reinforced
• Use: MX
• Connecting link: Split link
• EK Chain Type: MRD7
• Manufacturer part number: 3065494

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:
GAS GAS MCF 250 2025
GAS GAS MCF 250 2024
GAS GAS MCF 250 2023
GAS GAS MCF 250 2022
GAS GAS MCF 250 2021
HUSQVARNA FC 250 2022
KTM SXF 250 2022
KTM SXF 250 2021
KTM SXF 250 2020
KTM SXF 250 2019
KTM SXF 250 2018
KTM SXF 250 2017