Re: 1974 15hp Johnson wont idle

[Don]

quote BillW:

Does the carb throttle valve close all the way when you back off the throttle? Does it start to open at the right point of mag advance? Just wondering if the synch is right. Flywheel key sheared but off by just a bit? Sounds like you have a real problem, although those engines didn’t idle right, right out of the box.

Yes, check the carb butterfly, these early motors like to get stiff due to all the crazy linkage…