excap232,
That is interesting, Mike Dooley at RC showcase recommended removing all the hardware from the carb. I'm talking the arms,return spring, the little black piece on the carb..basically everything. If you use the included hardware for the throttle shaft there is really no way to leave the return spring on since the collar(with the ball link) will not fit on the shaft. Mine is attached to the shaft with a set screw and loctite. I haven't noticed any looseness in the shaft infact my throttle linkage is rather tight. Has anyone else left the return spring in place??