Re: 1965 Johnson 3HP sputtering.
Three things come to mind. <br />Zeroth: Make sure your high (if applicable) and low speed carburator mixture adjustments are set right. Joe Reeves explains how
here.<br />First, if the ignition coils are cracked from age, then they arc over as you pick up revs, and the engine dies. It's a fairly common problem: I had a 3hp do the exact same thing. You may be able to inspect them without removing the flywheel - I'm not sure if your model has inspection holes in the flywheel.<br />Second, if it runs for a little bit or idles, you may have a fuel flow problem. Probably it's got a clogged fuel filter, which is above the brass nut on the fuel tank.<br />Third, your carburator probably need cleaning. Strip it, soak it in carb cleaner, blow it dry and rebuild. This is most likely your problem by what you described.<br /><br />Here's an
article you'll probably find interesting.<br />You'll need a manual to read over for 1 and 3. You can order one from Iboats, or you can probably borrow one from your local library.<br />Good luck!
