Hi Jackson,

Considering condition 1., I would focus on the fuel system since it appears you are not in an overloaded or air starved state.

With the vibration indicator let's eliminate a bad injector. At the dock, put in gear and load up the engine. Wrap plenty of rag or paper towel around the first injector and break the HP pipe going to it. I highly recommend using a flare nut wrench so you don't round the nut.
Observe & record the RPM drop.
Retighten & regain RPM.
Repeat on the other injector.
The lowest RPM is the worst injector. Service both if one is bad.

        Cheers, Russ
        Sweet 35 mk-1

  At 11:24 AM 20/08/2012, you wrote:
To clarify:
1. exhaust smoke looks just fine, as does the amount of water splooshing out
2. The powdery/rubbery stuff was only in the bilge.
3. We actually dove on the boat, so no fouling of prop and no excessive marine growth to account for the slowness. 4. The alternator and water pump belts were replaced by me about 4 weeks ago. The pulleys look rusty, but only on the edges, not in the grooves where the belts run. The belts are new to me, but old to the boat, so it's possible that they werent the best thing to put on...still, they seem to be working. I checked the tightness, and they are within spec.

thanks for all the input so far!

-Jackson





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