I rebuilt a 95 JT35 and found that not a lot of people have been into those, at least that I could find in America. I was concern about running the recommended 80:1 Gas/Oil ratio so I went 50:1. This seemed to produce more pre-detination due to more oil and less fuel. I went back to the Gas Gas recommended and I have less of it. I need to see what jets are in it, as I misplaced the paper I wrote all that on. I have found a filling station that sells fuel without ethanol in it. This is harder to find in our area (Washington state,USA) I think this has made a difference also. Especially in the starting. The bike starts very good but has such a high kick-starter gearing ratio that it is a challenge for me. I also checked the carb intake boot after it ran a while on break-in and re-tightening it, this also helped. I bought this bike in a box and thought it would be a good way to get back into trials ( as I have been paralized in my feet from a street bike accident 7 years ago) Now that I have finished it I have about as much invested as I could have paid for a slightly newer bike but......I know the bearings, shift drum and forks, as well as, all seals are new. A local guy purchase a 2000 Sherco for $1,500 US out of Idaho, I have pretty close to that in this with all the rebuild. Steve