Primary Drive chain and sprockets

installed my new drive system over the weekend and got to try it out yesterday on some near by trails with a friend on his brand new ktm300.



i decided to go with the 12/47 sprocket set with a 112 link RDO o'ring chain. i had been using a 12 c/s with the stock 43 tooth rear...better ratio than stock but still too tall of a ratio for single track.

i was also wanting to be able to move my axle further back for as much wheelbase as i could get...the 112 link chain was perfect. now it is at the last 3 line-up marks on the axle block instead of the front marks and i gained more than a inch of difference. and this does make a difference when your working your way up any challenging hill climb. overall i'm very pleased with this set up
i rode trails yesterday that had some challenging spots and i was really enjoying the new lower gearing.
12 c/s....47 rear....112 link chain.....awesome improvement

If you don't have a speedo corrector, or use a gps - you have seriously changed your actual speed from what your factory yamaha speedometer displays.

Something you may want to look into if you see plenty of pavement.

I'm guessing you may be off from reality by almost 25%.....

motokid wrote:

If you don't have a speedo corrector, or use a gps - you have seriously changed your actual speed from what your factory yamaha speedometer displays.

Something you may want to look into if you see plenty of pavement.

I'm guessing you may be off from reality by almost 25%.....

yes....that is on my "to do list".

here's what the 12 tooth c/s i had been using looked like after 2,000 miles....80% dirt/20% street use.
the original rear 43t and the stock chain still in very good shape. i was a little suprised that it was worn this bad.
if i had wanted to stick with the 12/43 set-up i would have just replaced this c/s and probably could have gone another 2k trouble free.