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I have been running my flats and bay with a 2 stroke johnson ocean pro 135 and have only hit 35mph at 5000 rpm and was expecting a faster top speed. I was out yesterday on a dead calm day with half a tank of gas so i made some adjustments to the jack plate and trim thinking that would have made a difference but no change. Any feedback would be appreciated. I do have a 4 blade prop but not sure of brand.
Jeff
 

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4 blades are not best for speed. And low to mid 30’s is common speed for boats. It’s probably physics, hydrodynamics at play. Takes so much mor to go faster. We see offshore boats with quad 350-400’s now. And they are really not that fast considering the horsepower. More of a look at me statement.
 

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I had a flats and bay 18x8 with a 115 Yamaha 2 stroke. It would do 42 with two or three people in it. Three blade stainless prop. Great boat
 

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That boat should be faster than that. What's the motor's compression?
 

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Need to know hull weight/load weight, prop diameter and pitch
in order to be able to calculate the expected top speed.
Without that information all I can do is guess.

135 Ocean Pro has a 2.25 to 1 gear ratio.
Rated WOT is 5000-6000 rpm.

Typical prop slip runs from 10 to 15%
 
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