I have a 25 hp kohler on a 1648 flat bottom, the boat has a scissor blind on it, the motor seems to have great takeoff but that's it, 2 guys and gear on open water was only 14 mph, maybe I'm expecting to much, any advice or tips would be helpful!

Sounds like it runs good. My guess is your prop is worn. Look at the gdevil website at a pic of a. New prop. Does it look like yours?

That speed is right on track for that sort of rig. There may be more to be had with a prop change but 2 guys, hunting gear, and a blind is asking a lot from 25hp

For reference my 1752 alweld with 27 hp Kohler mudbuddy lt runs 16.5-17 with 2 people battery and troller . But I have it on a 20 inch transom . I had to redo my transom it was running 14.5 on a 22.5 in transom and once I cut it down it gained 2 mph easy and is easi er to hold in water . I'm like the other guys your in the ballpark in mph but between transom and prop wear you possibly could stretch it for more mph

It has a brand new 9x7 hill marine prop on a 15" transom, I just ordered a tach, it doesn't seem like it's winding enough rpmsq

What about your cav plate or trailing edge . Is it riding deep or is it popping out wot?.... I'm not sure but gd website shows a 25 hp running a 9x6 prop

with a new 9x7 and two men with a scissor blind you should be around 3700 rpm. You should also be running around 18 or so if its a hunt load. I had the same setup for years and loved it. How is the boats attitude? Is it running nose down? Hull could have a hook at the transom.

Try a 9x6 prop. I had that engine and got 18 mph out of it on a 18x44 godevil boat.


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I've never had to fight the prop staying under water yet, now with a load equal to 3 guys all I could get was 6.5 mph, something really doesn't seem set right or the motor is weak

We did a leak down and compression test last night and both intake valves are shot