Re: 1963 Johnson QDL-24 10HP

[Don]

True, the carb throttle shaft can not go past the WOT position, I think there is a roll pin that hits a stop on the carb body….But, if the linkage is improperly installed, the throttle cam may try to push the throttle shaft past the WOT position which will just put excess pressure on the throttle shaft because it can’t go past the WOT position. The excess pressure (preloading) can damage, cause excess wear on the throttle shaft and carb body….
The carb butterfly is supposed to be closed at dead idle, and a little past idle position. There is a little notch on the throttle cam that should bisect the throttle roller when the butterfly is just starting to open….