MOTO-MASTER Ultralight Steel Rear Sprocket for YAMAHA, HONDA and FANTIC 1974-2026

The MOTO-MASTER steel rear sprocket is designed for YAMAHA TT 230, WR 250, WRF 250, WRF 400, WRF 426, WRF 450, YZ 125, YZ 250, YZF 250, YZF 400, YZF 426, YZF 450, HONDA NX 250, XL 250, XL 350, XL 400, XL 500, XL 600, XR 200, XR 250, XR 350, XR 500, XR 600 and FANTIC XE 125, XE 300, XEF 250, XEF 310, XEF 450, XX 125, XX 250, XXF 250, XXF 450 from 1974 to 2026. Bolted to the rear wheel, the sprocket takes all of the engine's force through the chain. Steel is the choice for durability: a steel sprocket sees off several chains where an aluminium one wears out, for a little more weight.

Specifications

• Brand: MOTO-MASTER
• Manufacturer part numbers: 620091140, 620091141, 620091142, 620091143, 620091144, 620091145, 620091146, 620091147, 620091148, 620091149, 620091150, 620091151, 620091152, 620091153
• Chain pitch: 520
• Material: steel
• Available versions: 40 Teeth: ref. 620091140; 41 Teeth: ref. 620091141; 42 Teeth: ref. 620091142; 43 Teeth: ref. 620091143; 44 Teeth: ref. 620091144; 45 Teeth: ref. 620091145; 46 Teeth: ref. 620091146; 47 Teeth: ref. 620091147; 48 Teeth: ref. 620091148; 49 Teeth: ref. 620091149; 50 Teeth: ref. 620091150; 51 Teeth: ref. 620091151; 52 Teeth: ref. 620091152; 53 Teeth: ref. 620091153
• Weight: 850 g

Choosing the right number of teeth

For the same bike, go for the number of teeth of your current sprocket (it's often stamped on it). More teeth on the rear sprocket shortens the gearing: more acceleration, lower top speed. Fewer teeth lengthens it. Even one or two teeth make a clear difference; if you change a lot, the chain length may need adjusting.

When to replace it?

• Teeth worn to a point or into a hook shape, worn down on one side only.
• Chain that lifts away from the sprocket when you pull it rearwards.
• Drivetrain noise, jerkiness or a chain that jumps under load.

Check the sprocket every time you service the chain. Always replace the rear sprocket, front sprocket and chain together: a new part running with worn ones wears out very quickly.

Fitting tips

1. Clean the hub and check that it isn't cracked or distorted.
2. Fit the sprocket the right way round (markings facing out) and tighten the bolts in a criss-cross pattern to the manufacturer's torque, with medium-strength threadlocker if the manual calls for it.
3. While you're at it, replace the front sprocket and the chain if they're worn.
4. Set the chain tension as per the manual, with the wheel aligned, then lube it with a suitable chain lube.
5. Recheck the bolt tightness and the chain tension after the first ride.

Why MOTO-MASTER?

Moto-Master is a Dutch brand founded in 1997 by Gaston Vernon that specialises in braking: discs, sintered pads and oversize kits. Its discs are designed in CAD and then laser-cut on CNC machines, with manufacturing in the Netherlands and ISO 9001:2015 certification.

Spare parts and items to plan

• Front sprocket : PBR · AFAM
• Drive chain : RENTHAL · RENTHAL 520
• Chain lube : LIQUI MOLY 400 ml · MUC OFF 400 ml

Frequently asked questions

Aluminium or steel?
Aluminium is lighter and works well for motocross and racing. Steel lasts longer: it's the best choice for enduro, sandy terrain or if you put in a lot of hours.

Should the chain be replaced at the same time?
Yes, if it's worn: a stretched chain wears out a new sprocket in a few hours.

Compatibility

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

Fits:
FANTIC XE 125 2026
FANTIC XE 125 2025
FANTIC XE 125 2024
FANTIC XE 125 2023
FANTIC XE 125 2022
FANTIC XE 125 2021
FANTIC XE 125 2020
FANTIC XE 300 2026
FANTIC XE 300 2025
FANTIC XE 300 2024
FANTIC XEF 250 2026
FANTIC XEF 250 2025
FANTIC XEF 250 2024
FANTIC XEF 250 2023
FANTIC XEF 250 2022
FANTIC XEF 310 2026
FANTIC XEF 310 2025
FANTIC XEF 310 2024
FANTIC XEF 450 2026
FANTIC XEF 450 2025
FANTIC XEF 450 2024
FANTIC XEF 450 2023
FANTIC XEF 450 2022
FANTIC XX 125 2026
FANTIC XX 125 2025
FANTIC XX 125 2024
FANTIC XX 125 2023
FANTIC XX 125 2022
FANTIC XX 125 2021
FANTIC XX 125 2020
FANTIC XX 250 2026
FANTIC XX 250 2025
FANTIC XX 250 2024
FANTIC XX 250 2023
FANTIC XX 250 2022
FANTIC XX 250 2021
FANTIC XX 250 2020
FANTIC XXF 250 2026
FANTIC XXF 250 2025
FANTIC XXF 250 2024
FANTIC XXF 250 2023
FANTIC XXF 250 2022
FANTIC XXF 450 2026
FANTIC XXF 450 2025
FANTIC XXF 450 2024
FANTIC XXF 450 2023
FANTIC XXF 450 2022
HONDA NX 250 1993
HONDA NX 250 1992
HONDA NX 250 1991
HONDA NX 250 1990
HONDA NX 250 1989
HONDA NX 250 1988
HONDA XL 250 1983
HONDA XL 250 1982
HONDA XL 350 1987
HONDA XL 350 1986
HONDA XL 350 1985
HONDA XL 350 1978
HONDA XL 350 1977
HONDA XL 350 1976
HONDA XL 350 1975
HONDA XL 350 1974
HONDA XL 400 1984
HONDA XL 400 1983
HONDA XL 400 1982
HONDA XL 400 1981
HONDA XL 400 1980
HONDA XL 400 1979
HONDA XL 500 1987
HONDA XL 500 1986
HONDA XL 500 1985
HONDA XL 500 1984
HONDA XL 500 1983
HONDA XL 500 1982
HONDA XL 600 1988
HONDA XL 600 1987
HONDA XL 600 1986
HONDA XL 600 1985
HONDA XL 600 1984
HONDA XL 600 1983
HONDA XR 200 2002
HONDA XR 200 2001
HONDA XR 200 2000
HONDA XR 200 1999
HONDA XR 200 1998
HONDA XR 200 1997
HONDA XR 200 1996
HONDA XR 200 1995
HONDA XR 200 1994
HONDA XR 200 1993
HONDA XR 200 1992
HONDA XR 200 1991
HONDA XR 200 1990
HONDA XR 200 1989
HONDA XR 200 1988
HONDA XR 200 1987
HONDA XR 200 1986
HONDA XR 200 1985
HONDA XR 200 1984
HONDA XR 250 1989
HONDA XR 250 1988
HONDA XR 250 1987
HONDA XR 250 1986
HONDA XR 250 1985
HONDA XR 250 1984
HONDA XR 250 1983
HONDA XR 250 1982
HONDA XR 350 1985
HONDA XR 350 1984
HONDA XR 350 1983
HONDA XR 500 1985
HONDA XR 500 1984
HONDA XR 500 1983
HONDA XR 500 1982
HONDA XR 500 1981
HONDA XR 600 1987
HONDA XR 600 1986
HONDA XR 600 1985
YAMAHA TT 230 2026
YAMAHA TT 230 2025
YAMAHA TT 230 2024
YAMAHA TT 230 2023
YAMAHA TT 230 2022
YAMAHA TT 230 2021
YAMAHA TT 230 2020
YAMAHA TT 230 2019
YAMAHA TT 230 2018
YAMAHA TT 230 2017
YAMAHA TT 230 2016
YAMAHA TT 230 2015
YAMAHA TT 230 2014
YAMAHA TT 230 2013
YAMAHA TT 230 2012
YAMAHA TT 230 2011
YAMAHA TT 230 2010
YAMAHA TT 230 2009
YAMAHA TT 230 2008
YAMAHA TT 230 2007
YAMAHA TT 230 2006
YAMAHA TT 230 2005
YAMAHA WR 250 2012
YAMAHA WR 250 2011
YAMAHA WR 250 2010
YAMAHA WR 250 2009
YAMAHA WR 250 2008
YAMAHA WR 250 2001
YAMAHA WR 250 2000
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
YAMAHA WRF 250 2019
YAMAHA WRF 250 2018
YAMAHA WRF 250 2017
YAMAHA WRF 250 2016
YAMAHA WRF 250 2015
YAMAHA WRF 250 2014
YAMAHA WRF 250 2013
YAMAHA WRF 250 2012
YAMAHA WRF 250 2011
YAMAHA WRF 250 2010
YAMAHA WRF 250 2009
YAMAHA WRF 250 2008
YAMAHA WRF 250 2007
YAMAHA WRF 250 2006
YAMAHA WRF 250 2005
YAMAHA WRF 250 2004
YAMAHA WRF 250 2003
YAMAHA WRF 250 2002
YAMAHA WRF 250 2001
YAMAHA WRF 400 2002
YAMAHA WRF 400 2001
YAMAHA WRF 400 2000
YAMAHA WRF 400 1999
YAMAHA WRF 426 2002
YAMAHA WRF 426 2001
YAMAHA WRF 450 2026
YAMAHA WRF 450 2025
YAMAHA WRF 450 2024
YAMAHA WRF 450 2023
YAMAHA WRF 450 2022
YAMAHA WRF 450 2021
YAMAHA WRF 450 2020
YAMAHA WRF 450 2019
YAMAHA WRF 450 2018
YAMAHA WRF 450 2017
YAMAHA WRF 450 2016
YAMAHA WRF 450 2015
YAMAHA WRF 450 2014
YAMAHA WRF 450 2013
YAMAHA WRF 450 2012
YAMAHA WRF 450 2011
YAMAHA WRF 450 2010
YAMAHA WRF 450 2009
YAMAHA WRF 450 2008
YAMAHA WRF 450 2007
YAMAHA WRF 450 2006
YAMAHA WRF 450 2005
YAMAHA WRF 450 2004
YAMAHA WRF 450 2003
YAMAHA YZ 125 2026
YAMAHA YZ 125 2025
YAMAHA YZ 125 2024
YAMAHA YZ 125 2023
YAMAHA YZ 125 2022
YAMAHA YZ 125 2021
YAMAHA YZ 125 2020
YAMAHA YZ 125 2019
YAMAHA YZ 125 2018
YAMAHA YZ 125 2017
YAMAHA YZ 125 2016
YAMAHA YZ 125 2015
YAMAHA YZ 125 2014
YAMAHA YZ 125 2013
YAMAHA YZ 125 2012
YAMAHA YZ 125 2011
YAMAHA YZ 125 2010
YAMAHA YZ 125 2009
YAMAHA YZ 125 2008
YAMAHA YZ 125 2007
YAMAHA YZ 125 2006
YAMAHA YZ 125 2005
YAMAHA YZ 125 2004
YAMAHA YZ 125 2003
YAMAHA YZ 125 2002
YAMAHA YZ 125 2001
YAMAHA YZ 125 2000
YAMAHA YZ 125 1999
YAMAHA YZ 250 2026
YAMAHA YZ 250 2025
YAMAHA YZ 250 2024
YAMAHA YZ 250 2023
YAMAHA YZ 250 2022
YAMAHA YZ 250 2021
YAMAHA YZ 250 2020
YAMAHA YZ 250 2019
YAMAHA YZ 250 2018
YAMAHA YZ 250 2017
YAMAHA YZ 250 2016
YAMAHA YZ 250 2015
YAMAHA YZ 250 2014
YAMAHA YZ 250 2013
YAMAHA YZ 250 2012
YAMAHA YZ 250 2011
YAMAHA YZ 250 2010
YAMAHA YZ 250 2009
YAMAHA YZ 250 2008
YAMAHA YZ 250 2007
YAMAHA YZ 250 2006
YAMAHA YZ 250 2005
YAMAHA YZ 250 2004
YAMAHA YZ 250 2003
YAMAHA YZ 250 2002
YAMAHA YZ 250 2001
YAMAHA YZ 250 2000
YAMAHA YZ 250 1999
YAMAHA YZF 250 2026
YAMAHA YZF 250 2025
YAMAHA YZF 250 2024
YAMAHA YZF 250 2023
YAMAHA YZF 250 2022
YAMAHA YZF 250 2021
YAMAHA YZF 250 2020
YAMAHA YZF 250 2019
YAMAHA YZF 250 2018
YAMAHA YZF 250 2017
YAMAHA YZF 250 2016
YAMAHA YZF 250 2015
YAMAHA YZF 250 2014
YAMAHA YZF 250 2013
YAMAHA YZF 250 2012
YAMAHA YZF 250 2011
YAMAHA YZF 250 2010
YAMAHA YZF 250 2009
YAMAHA YZF 250 2008
YAMAHA YZF 250 2007
YAMAHA YZF 250 2006
YAMAHA YZF 250 2005
YAMAHA YZF 250 2004
YAMAHA YZF 250 2003
YAMAHA YZF 250 2002
YAMAHA YZF 250 2001
YAMAHA YZF 400 1999
YAMAHA YZF 400 1998
YAMAHA YZF 426 2002
YAMAHA YZF 426 2001
YAMAHA YZF 450 2026
YAMAHA YZF 450 2025
YAMAHA YZF 450 2024
YAMAHA YZF 450 2023
YAMAHA YZF 450 2022
YAMAHA YZF 450 2021
YAMAHA YZF 450 2020
YAMAHA YZF 450 2019
YAMAHA YZF 450 2018
YAMAHA YZF 450 2017
YAMAHA YZF 450 2016
YAMAHA YZF 450 2015
YAMAHA YZF 450 2014
YAMAHA YZF 450 2013
YAMAHA YZF 450 2012
YAMAHA YZF 450 2011
YAMAHA YZF 450 2010
YAMAHA YZF 450 2009
YAMAHA YZF 450 2008
YAMAHA YZF 450 2007
YAMAHA YZF 450 2006
YAMAHA YZF 450 2005
YAMAHA YZF 450 2004
YAMAHA YZF 450 2003