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'14 SX120 sprocket input please

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summit_man

Member
Nov 23, 2008
223
21
18
Sioux Falls SD
Looking for some insight on what people are feeling works best.
I'm running a '12 RMZ450 this year with my\ '14 SX 120 kit
Currently it's set up with 12-17 , 17-17
I can't run a 13 tooth because 66 pin chain is to short. I presume I would be able to run a 13-16 then? If so what should I run for sprockets in the chain case? Surprised there currently 17-17!!

I had this set up on my 09 RMZ last year and the 12-17 , 17-17
Seemed to be geared a bit low. That bike was only a 4 speed though.

Any input before tomorrow afternoon would be appecoated! I need to get sprockets ordered tomorrow!

Thank you in advance
 
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Pedec

Member
Jul 1, 2014
88
11
8
I am running a 2013sx120 with 66 link chain and have 12-16 17-17 combination and mounted on my 2012 ktm 250sx and there is chain slack 1/2 inch which is good that you need on any kit that has skid movement like sx. I am using the spring under tightener trick which is working really good. But my setup is geared to low with my 250sx 5 speed only getting 35mph top speed. I want to try 13 sprocket but will need to buy another chain I am sure to try which sucks.
 
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