Re: "Newer" 25/35hp OMC compatibilities

[Casey Lynn]

quote johnyrude200:

It was turning 4800RPM, max, with a test prop. Basically it would hit “max RPM” (for now), hold that for about 8-12 seconds, then lose power. It was pulsating at the top end and acting erratically at anything beyond 2/3rd throttle. I double checked the link and sync and that is all OK. Didn’t get to work on it again yet, but the float was set a bit off, so I’m going to adjust that and then retest. I pulled the high speed jet before typing the last post to insure it was correct, and also clean. The TACH I’m using is a simple one that involves winding a wire around a single plug lead. I will say the motor idles down to a respectable 760RPM before wanting to stall out.
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The symptom of hitting a good WOT RPM then slowing is indicative of an enlarged high speed jet. Your "checking" probably consisted of verifying that it was the correct number stamped on the side of the jet and thats more than most folks will do so good for you.
Having seen this scenario countless times, I have lost count on how many HS jets I have seen that have internal erosion that ends up creating an oversized orifice. Change out the jet with brand new, not another used jet.
If you have a number drill set that is unmolested you can check the jet. With what you are describing I would bet you will find at least .004 larger than what the jet is supposed to be.