Don't want a mechanic touchin her manifold? Great site. Read a lot of posts. Here goes. I got a mercruiser 140 from 1971. GM inline 4. has a 2 barrell Rochester carb. after I bought it I noticed rust in gas tank. Replaced tank and all fuel lines and rebuilt carb back to spec. That was pretty easy and fun. Got every measurement precise. have no doubts bout that. Rebuilt distributor since couldn't get new one. However have replaced condenser and point and cap and plugs and wires. Did a compression test today and almost 120 across board. First stroke the gauge would jump hard with each cylinder. So pretty sure all is ok here. and got timing set to 6' btdc. It has a mechanical advance that looks great. No rust and all looks to function well. This all made this boat run much better except for a very slight miss when on it good. And when you rev it up real quick there is a puff of black smoke. But then you don't see the smoke anymore. Only for that short burst. Oh and plugs are gapped at .035. Think that's correct. Any ideas before someone elses hands are on her parts. Thanks
