Need some info on my 84 xt600 and my Yamaha Factory Service manual is with a friend who took a trip to Mexico. My bike just recently has been hard to start and when does start has been popping and sputtering under load and in neutral at 3,600 + rpm's. Somedays it starts and act fine and others it never acts all right. I thought it was the carb and have cleaned it out a few times and then after riding get the same results. It usually starts acting up after it's been running 30-60 minutes. Today I put a timing light on it a relized while kicking it over it was only lighting the timing light once every three kicks on average. Also the spark looked pretty weak while kicking it over until I put a battery charger on it while kicking, that seemed to make it better (a nice blue spark vs. the previous blue/orange spark). When it did start it would idle for 30 seconds then the timing light would go out and the bike would die. When I rev it in neutral it would rev to around 3,600 then miss (the timing light would go out) then it would die, then come back on and the light would light back up, so I think I have narrowed to ignition . I am just not sure what part, I checked ohms on the red and brown wires to the stator and got 209 ohms. I also started checking the stator per Elctrux web-site and it checked out ok if I did it right anyway. Revved to 2,500 rpm and voltage was 13.5 and revved to 5,000 rpm and voltage dropped to 12.2 (not sure if this is right, but their sight said under 14.5 was OK. I am not sure what the ohms should be on the coil or how to check it for that matter. I feel helpless without my manual. Could some one steer me in the right direction on diagnosing this thing. Unfortuneatly I hae no one around here to swap parts with either, so I will have to try and get it right the first time, all help will be greatly appreciated. Thanks a lot, Jason...