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I have a '90 50/35HP jet on a 15ft aluminum flat bottom boat. When I took it out for a test drive before I bout it it would go 25mph. The powerhead was rebuilt. I added a couple batteries and my tackle and the speed has dropped to 18 mph. It just doesn't rev. I checked compression and it was 90 psi on all three cylinders. It sounds OK when it runs but sometimes has a slight miss. Spark plugs were a little fouled and it burnt about 6 gals of gas in 25 miles. What else could cause this problem or is this about the top speed I should be getting?
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