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[Moto7575]

Hi !

My dealer told me that there is a smaller sprocket option for FXS adding 5-10% torque (of course at the cost of a lower speed). Did anybody here about this ? Do you have a reference - could not find it...

[TheRan]

The chain conversion kit has lower gearing, comes out to 1:5.4 compared to 1:5 stock (or 1:4.5 for some of the 14.4 bikes). I don't know whether it changes the top speed, whether the limit is based on the speedo reading or the motor RPM.

[Moto7575]

Thanks ! Yes but he told me it is not the chain kit, but just changing a sprocket & keeping a belt.

[TheRan]

Was he specifically talking about the FXS? If not he may have been on about swapping one of the 14.4 bikes from 20t to 18t.

[mdjak1]

Hi !

My dealer told me that there is a smaller sprocket option for FXS adding 5-10% torque (of course at the cost of a lower speed). Did anybody here about this ? Do you have a reference - could not find it...

The most simple way to find something like this is to go to AF1Racing.com and look at the spare parts catalogs. 
https://www.af1racing.com/2014-2020-FX-FXS-Spare-Parts-Catalogs

Here is the one for the 2018 FXS:

https://www.af1racing.com/store/ProdImages/st3/18FXS.pdf

Page 29 shows that there are two front sprockets:

18 tooth: 30-08117
20 tooth: 30-08116

[Moto7575]

Thanks ! This is a 96 € part, exactly what I looked for - not existing in 2017, but it is proposed in 2018. It should increase torque by 10% and 0-60 time by 10%, exactly what I was looking for !

[TheRan]

I didn't realise the 2017 models ran the 20t sprocket, I figured that was only put on the more powerful models.

[mdjak1]

I wonder if it would be easier to wheelie my 2017 FXS with an 18 tooth sprocket?