Re: Sears Tanaka Gamefisher 3.0 HP Modifications
Forget getting more out of that Tanaka engine. It's already at it's maximum, I guarantee.
Yours looks pretty good, so it'd probably pull some money on ebay. Then, buy an older Johnson or Evinrude that matches the maximum hp rating on your boat's tag. Most 12' jon boats are rated at between 5-10hp. It might cost you a little more, but the difference will be amazing. They're quiet, smooth-running, and don't vibrate.
Those little Tanaka's are essentially crappy little outboards, derived from string-trimmer engines. Blech! Seriously.