After 2 weeks of troubleshooting,I finally figured out what was causing my Quannon 150 to run poorly,which included not idling,stalling,missing,surging,and being so difficult to start,I would run my battery down.There is a vacuum operated fuel valve (petcock) on the bottom of the tank that supplies the carb fuel when its running.The top hose goes to the carb,while the bottom is a vacuum line that goes to the intake.The petcock was letting fuel into my engine from the vacuum hose,which is not supposed to happen but apparently the rubber seal inside was allowing fuel to leak past.I changed the plug,adjusted the valves,checked the resistance of the coil,tps, and auto bystarter before I figured this out.I temporarily have bypassed the petcock altogether until my new petcock gets here,and just come back from a 2.5 hour ride and the bike runs like new.Just wanted to share since there seems to be very little support for this machine.Bike only has 7500 miles on it,but I don't know the history of it and wouldn't think this part would fail this early,but apparently its very common (just check some of the Harley forums).So,if your bike won't idle,your oil smells like gas,it misses and surges on the highway,and its difficult to start,I would check the petcock vacuum line first and if you have fuel in it,there's your headache ! They are available on EBay for about $8 shipped,but I ordered the OEM one for $25.Happy riding and be safe !
