Hello all,
Finally got to see how fast my 225 Sundowner 351 OMC would run today after fixing the dropped plug wire - and the newly refurbished propeller that my repair shop tweaked for me...I am thrilled to say that we are running at approx 46 mph and 4700 rpm (it was fast enough to scare my wife and she made me slow down....)
However, towards the end of last weekend, we started having intermittent power issues, like surging as we finished up the day. When it died, it was rough to start, but then idled fined. Had it back out again today to replace the carpeting on my bunks and see if the dropped plug wire was the issue - and it was fantastic...
EXCEPT, the engine would, as you ease up to WOT (3000 - 4000) start surging, and initially, it was only at high end rpms but now it is doing it lower, like in the 2500 range as well, and when I discuss surging, I mean it will come up to speed and plane, and then just cut out almost a 1/3 of the rpms and kind of surge back and forth, almost to the point of sputtering out, unless I bring it back down to idle. Before I go take this to a mechanic and spend big bucks, I would like an opinion on what the issue here is. I am thinking fuel filter or fuel pump is failing, not getting gas to the carb. Otherwise the carb could be fouled/gunked up, or even in need of rebuild/replace. Is the lack of air displacement in the tiny engine compartment the cause? It ran exceptionally well with the engine deck seat off.....Any advice??? I am pulling my hair out, I just want to be able to boat this summer without being bit by the gremlins...
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