Reply To: Backfire/misfire thru carb

[Don]

I dunno buddy, I don’t think trying to increase the water pressure with an electric pump is something you can do very easily.  Keep in mind that increased water pressure will most likely overcome the bypass valve springs and result in the engine running cold/poorly at low speeds.    There are many passages that can get plugged up, packed with sand/silt easily.  I really think you should sell this thing while you have it running OK.  You will probably end up spending more time fixing/diagnosing it than actually using/enjoying it.  I’m not trying to be rude, just realistic.  Like I have said, these things were not OMC’s finest hour, and never worked all that well even when working “correctly”.   Did you ever add those fittings in the top of the heads, like the original powerhead had?