I am a newbie to TT and need some assistance with my son's 1986 Honda XR80. The bike ran well with the exception of smoking really bad when it was running. To keep the EPA and neighbors happy we changed the rings and gaskets in order to resolve the smoking issue. All went well with the ring replacement and reassembly. Once we put it all back together, we were unable to get her started. I have read many of the threads and followed the advice regarding the carb. I have removed the carb and cleaned the jets, bowl and checked the float. All were fine. We have turned both the air and fuel mixture screws all the way in and backed the air screw out 1 1/2- 2 1/2 turns and the fuel screw out 2 - 3 turns. On a few occassions the bike acted like it wanted to start and as I held the throttle all the way open it did run. It started to sputter at first then the idle increased and I was able to release the throttle a bit but it would not idle. I have checked all the gaskets for vac leaks but all are well. I am at wits end and my son is beginning to lose hope for every riding his XR again. Does anyone have any ideas or suggestions? Any assistance will be greatly appreciated.