INNTECK Front Sprocket for HONDA CR 80, CR 85, CRF 50, CRF 70, XR 50, XR 70 1986-2012

On HONDA CR 80, CR 85, CRF 50, CRF 70, XR 50, XR 70 from 1986 to 2012, the INNTECK front sprocket fits in place of the original part. Mounted on the gearbox output shaft (countershaft), the front sprocket passes the engine's torque on to the chain. Every tooth is loaded on every turn of the wheel: a worn front sprocket makes the chain jump and speeds up wear on the whole drivetrain.

Specifications

• Brand: INNTECK
• Manufacturer part numbers: 273-13, 273-14, 273-15
• Available versions: 13 Teeth: ref. 273-13; 14 Teeth: ref. 273-14; 15 Teeth: ref. 273-15

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.

Spare parts and items to plan

• Rear sprocket : PBR · AFAM
• Drive chain : AFAM A420R1-G · AFAM A420MX2-G
• 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 80 2003
HONDA CR 80 2002
HONDA CR 80 2001
HONDA CR 80 2000
HONDA CR 80 1999
HONDA CR 80 1998
HONDA CR 80 1997
HONDA CR 80 1996
HONDA CR 80 1995
HONDA CR 80 1994
HONDA CR 80 1993
HONDA CR 80 1992
HONDA CR 80 1991
HONDA CR 80 1990
HONDA CR 80 1989
HONDA CR 80 1988
HONDA CR 80 1987
HONDA CR 80 1986
HONDA CR 85 2007
HONDA CR 85 2006
HONDA CR 85 2005
HONDA CR 85 2004
HONDA CR 85 2003
HONDA CRF 50 2012
HONDA CRF 50 2011
HONDA CRF 50 2010
HONDA CRF 50 2009
HONDA CRF 50 2008
HONDA CRF 50 2007
HONDA CRF 50 2006
HONDA CRF 50 2005
HONDA CRF 50 2004
HONDA CRF 50 2003
HONDA CRF 50 2002
HONDA CRF 50 2001
HONDA CRF 50 2000
HONDA CRF 70 2012
HONDA CRF 70 2011
HONDA CRF 70 2010
HONDA CRF 70 2009
HONDA CRF 70 2008
HONDA CRF 70 2007
HONDA CRF 70 2006
HONDA CRF 70 2005
HONDA CRF 70 2004
HONDA CRF 70 2003
HONDA CRF 70 2002
HONDA CRF 70 2001
HONDA CRF 70 2000
HONDA XR 50 2012
HONDA XR 50 2011
HONDA XR 50 2010
HONDA XR 50 2009
HONDA XR 50 2008
HONDA XR 50 2007
HONDA XR 50 2006
HONDA XR 50 2005
HONDA XR 50 2004
HONDA XR 50 2003
HONDA XR 50 2002
HONDA XR 50 2001
HONDA XR 50 2000
HONDA XR 70 2012
HONDA XR 70 2011
HONDA XR 70 2010
HONDA XR 70 2009
HONDA XR 70 2008
HONDA XR 70 2007
HONDA XR 70 2006
HONDA XR 70 2005
HONDA XR 70 2004
HONDA XR 70 2003
HONDA XR 70 2002
HONDA XR 70 2001
HONDA XR 70 2000