With that new information you open up the possibility of exhaust system backpressure contributing to the problem. It can be due to a variety of conditions including internal muffler debris or an internally collapsed exhaust hose. Are you able to reach full expected RPM?
Here's a peek at the inside of the mixing elbow.
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Neil
1977 Catalina 30
San Pedro, California
prior boats 1987 Westsail 32, 1970 Catalina 22
Had my hands in a few others
Last edited by ndutton; 08-03-2014 at 09:04 PM.
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