Join Date: Feb 2010
Location: Fountain Valley, CA
ATC 70 Fix 'em up
Well, I got started and got some great help in the New Member forum so I thought it was time to move over to the R&M forum.
I have an '85 ATC 70 stock that's been sitting for a long time. Previously, the tank had rust and I used the PRO-15 kit on it. I pulled the carb and cleaned all. I have a carb re-build kit but I think the carb has all new stuff from before. Anyway, I cleaned it up good put it back together, checked the air filter. Checked spark and it looks good so I fired it up. It started and sounded fine, so I started to adjust the idle screw. After the engine warmed up some and while I was trying to dial in the carb, it quit and I wasn't able to get it to start again. I pulled the carb again and re-checked/cleaned the main and slow jets. Also re-checked the screen filter as it had a bunch of rust/dirt from before. I put a new plug in today and cranked it over with no luck. I adjusted the air/mix screw most of the way in and adjusted the idle screw all the way in and tried again. I got it to start and then it ran for awhile but was missing/sputtering when I rev it. Played with the air/mix screw a bit and then after it warmed up it quit again. Seems like it's getting gas, so I'm now thinking I should check the timing? Any ideas on if it's carb/gas related or a possible timing issue?