INNTECK Front Sprocket for SHERCO 250, 300, SE 125, SE 250, SE 300, SEF 250, SEF 300 2009-2026

The INNTECK front sprocket is designed for SHERCO 250, 300, SE 125, SE 250, SE 300, SEF 250, SEF 300 from 2009 to 2026. 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: INNTECK
• Manufacturer part numbers: 420KC-13, 420KC-14
• Available versions: 13 Teeth: ref. 420KC-13; 14 Teeth: ref. 420KC-14

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 : INNTECK 23-316 · INNTECK 23-316
• Drive chain : AFAM
• Chain lube : LIQUI MOLY 400 ml · MUC OFF 400 ml

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:
SHERCO 250 2011
SHERCO 250 2010
SHERCO 250 2009
SHERCO 300 2011
SHERCO 300 2010
SHERCO 300 2009
SHERCO SE 125 2026
SHERCO SE 125 2025
SHERCO SE 125 2024
SHERCO SE 125 2023
SHERCO SE 125 2022
SHERCO SE 125 2021
SHERCO SE 125 2020
SHERCO SE 125 2019
SHERCO SE 125 2018
SHERCO SE 250 2011
SHERCO SE 250 2010
SHERCO SE 250 2009
SHERCO SE 300 2011
SHERCO SE 300 2010
SHERCO SE 300 2009
SHERCO SEF 250 2020
SHERCO SEF 250 2019
SHERCO SEF 250 2018
SHERCO SEF 250 2017
SHERCO SEF 250 2016
SHERCO SEF 250 2015
SHERCO SEF 250 2014
SHERCO SEF 250 2013
SHERCO SEF 250 2012
SHERCO SEF 300 2020
SHERCO SEF 300 2019
SHERCO SEF 300 2018
SHERCO SEF 300 2017
SHERCO SEF 300 2016
SHERCO SEF 300 2015
SHERCO SEF 300 2014
SHERCO SEF 300 2013
SHERCO SEF 300 2012