Home › Forum › Ask A Member › Idle issues on my FD-11 › Re: Idle issues on my FD-11
Advance the throttle, and watch the carb linkage. It should just start to move when the roller is at the hash mark on the cam. That is easy enough to check.
Then try turning low speed needle, CCW, or out 1/4 to 1/2 a turn.
Another thing to check is to run it at night with cowl off. I wonder if at that throttle setting, the plug wire is chafed and shorting out to the powerhead somewhere. You should see and hear the arcing. Neon spark testers wired inline while you throttle down would show inconsistent spark as well, showing you it is spark related.
The air leak could be from many places, from the connectors at tank or motor, to the fuel line itself, to the crank seal Mumbles mentioned, to the carb (welch plug, throttle shaft,etc) It can sometimes be a bear to pinpoint, sometimes easily found.