lowtimer
Pre-takeoff checklist
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- Jul 9, 2008
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Lowtimer
What is your prop pitch? What does the boat weigh, (run the rig across a set of scales, launch the boat and reweigh). First thing I would suspect if you have an issue making power like that is you have a problem with your reed valves.
My experience with older Johnson outboards is that reed valve problems don't come and go like this. It's easy enough to check, run it with the air silencer box off when it only goes 5 mph, if being caused by reeds you will see fuel being spit back out the throat of the carb on the offending cylinder.