Quote:
Originally Posted by rickinnj
In forward, my engine maxes out at 970 rpm.
In neutral, she revs to the moon and back.
1. pulled the plugs - very sooty and dry.
2. compression test - 120,120,100,120.
3. pulled flame arrester - no change.
3a. choke is open
4. loosened packing gland - no change.
5. pulled exhaust off the manifold - no change.
5a. no loose flakes or obstructions inside the manifold.
6. dumped my old fat butt over the side to inspect the prop - clean with no fouling.
This year I changed out the Indigo 10x7 for a Darglo Featherstream 12x7. I knew I'd lose some rpm with the 2 inch extra diameter, but not this much!
Suggestions?
Rick Bushie
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Something is way wrong. That prop is a normal A4 size assuming it is a 2-blade.
Are you sure the laser tach is working right?
Is the prop shaft free? You should be able to turn it by hand easily in neutral.
Are you SURE you have the right firing order? There is way to swap the plug wires and get a fairly smooth 2 cylinder engine.
You need a vacuum gauge. You
really need one. Moyer sells them, there are tons on FleaBay and Amazon, the local car parts place sells them, and so on.
Are you sure the prop is clean? My boat has been fouling at an incredible rate this year.
See photo - the gauges let you know what is going on. High vacuum and low RPM means the engine is at least trying.