Originally Posted by wmaxj
First off what a great site and resource, thanks to all that have posted! I have tried to digest all 284 pages but need a little help. I just purchased a 2013 exc 500. I have the following questions:
1. I want to do the desmog, so I can use the 3.5 KTM gas tank. Some of the post say to remap, some it would appear leave the stock mapping program. My dealer won't do a remap. Is it OK to desmog and us the stock mapping?
2. On re-gearing, most of the posts say to go with a 13 or 14 CS and 48 rear, will the stock chain work with the new setup?
Thanks for you help,
Gray headed old fart
I tried the 14/48 gearing and while it works and you can use the OEM chain you will find the 50 tooth rear sprocket is the optimum setup especially if you are going to climb any steep grades or ride any slow technical single track. You don't need to buy a new chain. Just add 2 extra links to the OEM chain. You will need another master link.