My 2GMF 13HP on my 29 mk 2 is dropping RPMs at max throttle under load. It also appears to drift a bit while operating at a fixed throttle. Tied at the dock forward seems to have more difficulty that reverse. I should be able to get up to 3200-3400 RPM (and have been able to in recent times with no issue, but I'm only getting to about 2500-2800. When I open the throttle wide it in gear it initially goes to high RPMs and then drops back. I replaced the fuel filter and the symptom remains the same. Any thoughts on what to look for and approaches to debug?
I've got the service manual and Don Casey's book on small engines, but nothing is matching the symptoms in trouble shooting exactly well. So my theories are (in approximate order of suspicion from my novice perspective based on reading) Governor is faulty and needs adjustment Injector faulty Fuel pump issue Air/water in fuel (I think I've mostly ruled this out)
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