ORIGINAL: controlliner
Earl, Do you have the default setting for the HS and LSN on the Fox .15 Bushing Schneurle? It has the old metered butterfly carb. I can't get the LSN set to save my life. I'm using Omega 10 % with extra castor added and a new Fox short plug.
Ok for the Fox 15 Schnuerle engines carb settings.
Close the throttle, and adjust the idle stop screw on top of the carb so that there is a hairline opening in the intake.
Then screw in the idle mixture needle until it just stops and unscrew it one turn.
Then screw in the high speed needle until it just stops and unscrew it three and one half turns.
After that just make adjustments that let the engine run, try not to fine tune anything until the engine has about one and one half hours of run time on it.