MOTO-MASTER Nitro Front Sprocket for HONDA CR 250, CR 500, CRF 250, CRF 450 1988-2027

The MOTO-MASTER Nitro front sprocket is designed for HONDA CR 250, CR 500, CRF 250, CRF 450 from 1988 to 2027. The front sprocket drives the chain at the gearbox output. Small and working hard, it wears faster than the rear sprocket: it's also the simplest way to change the bike's gearing.

Specifications

• Brand: MOTO-MASTER
• Manufacturer part numbers: 610021213, 610021214
• Chain pitch: 520
• Material: steel
• Available versions: 13 Teeth: ref. 610021213; 14 Teeth: ref. 610021214
• Weight: 160 g

Choosing the right number of teeth

Start from the stock number of teeth. One tooth less on the front sprocket shortens the gearing (more acceleration, ideal on tight terrain); one tooth more lengthens it (more speed on fast tracks). One tooth on the front sprocket is worth roughly three to four teeth on the rear sprocket.

When to replace it?

• Teeth thinned, pointed or hooked.
• Chain that jumps or slaps under acceleration.
• Play between the sprocket and the shaft, or marked splines.

Check it every time you service the chain and replace it along with the rear sprocket and the chain. Many riders change the front sprocket with every new chain, because it wears much faster than the rear sprocket.

Fitting tips

1. Loosen the sprocket nut or bolt while holding the rear wheel with the brake, before slackening the chain.
2. Clean the countershaft and check the oil seal behind the sprocket.
3. Fit the sprocket the right way round, with a lock washer or threadlocker as on the original assembly, and tighten to the manufacturer's torque.
4. Set the chain tension and lube it with chain lube.

Why MOTO-MASTER?

In motocross, Moto-Master was working with the Red Bull KTM Factory Racing team as early as 2010, and it backed the MXGP world championship in 2015. On the technical side, the Flame profile of its discs is designed to improve cooling and go easy on the pads, and its Racing GP sintered pads use a backing plate with hooks (NRS technology) that stops the friction material from coming away.

Spare parts and items to plan

• Rear sprocket : RFX FXRS · RFX FXRS 10
• Drive chain : RENTHAL 520 · RENTHAL
• Chain lube : LIQUI MOLY 400 ml · SCOTTOILER

Frequently asked questions

Should the rear sprocket be changed too?
If it's worn, yes: a new front sprocket running on a tired rear sprocket and chain is worn out within a few hours.

Compatibility

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

Fits:
HONDA CR 250 2007
HONDA CR 250 2006
HONDA CR 250 2005
HONDA CR 250 2004
HONDA CR 250 2003
HONDA CR 250 2002
HONDA CR 250 2001
HONDA CR 250 2000
HONDA CR 250 1999
HONDA CR 250 1998
HONDA CR 250 1997
HONDA CR 250 1996
HONDA CR 250 1995
HONDA CR 250 1994
HONDA CR 250 1993
HONDA CR 250 1992
HONDA CR 250 1991
HONDA CR 250 1990
HONDA CR 250 1989
HONDA CR 250 1988
HONDA CR 500 2001
HONDA CR 500 2000
HONDA CR 500 1999
HONDA CR 500 1998
HONDA CR 500 1997
HONDA CR 500 1996
HONDA CR 500 1995
HONDA CR 500 1994
HONDA CR 500 1993
HONDA CR 500 1992
HONDA CR 500 1991
HONDA CR 500 1990
HONDA CR 500 1989
HONDA CR 500 1988
HONDA CRF 250 2027
HONDA CRF 250 2026
HONDA CRF 250 2025
HONDA CRF 250 2024
HONDA CRF 250 2023
HONDA CRF 250 2022
HONDA CRF 450 2027
HONDA CRF 450 2026
HONDA CRF 450 2025
HONDA CRF 450 2024
HONDA CRF 450 2023
HONDA CRF 450 2022
HONDA CRF 450 2021
HONDA CRF 450 2020
HONDA CRF 450 2019
HONDA CRF 450 2018
HONDA CRF 450 2017
HONDA CRF 450 2016
HONDA CRF 450 2015
HONDA CRF 450 2014
HONDA CRF 450 2013
HONDA CRF 450 2012
HONDA CRF 450 2011
HONDA CRF 450 2010
HONDA CRF 450 2009
HONDA CRF 450 2008
HONDA CRF 450 2007
HONDA CRF 450 2006
HONDA CRF 450 2005
HONDA CRF 450 2004
HONDA CRF 450 2003
HONDA CRF 450 2002