Re: 1972 Johnson 9.5 blowing blue smoke
Ok, that would suggest that the needle in the needle & seat in the carburetor is leaking a bit, or the fuel pump is leaking. When all is well, pumping the primer will have not have an effect on the engine's running.<br /><br />To determine if the fuel pump is ok, unscrew it from the engine and pump the primer. If any gas comes out of the little hole on the back of it, then the diaphram is ruptured. I don't think this is the problem but it's easy enough to check. Usually when this is the problem one spark plug is tan and the other is black.<br /><br />So if it turns out to be the carburetor, pick up a service manual and a carb kit. If you want you can often borrow the service manual from the library. Get the carb kit from your local Johnson/Evinrude dealer because it comes with a new plastic modern fuel tolerant float to replace the troublesome cork one. The aftermarket kit sold online, etc, doesn't come with one. The dealer kit is only a couple bucks more anyway.
