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I have an 1984 150hp on an 18' Arrow Glass Freedom one I believe that is correct. The hole shot sucks what might I be doing wrong? I just bought this boat used a week ago and trying to figure it out. I have tried several different tilt and trim angles.
What pitch prop and how many rpms at wot?
Sounds like quite a bit of prop. Often times guys/gals will mistakenly go with some insane amount of pitch because "bubba" said pitch=speed.
It does, but only if you have the required horsepower to turn it - otherwise, it bogs, and limps it's way along overloading the motor until she finally gets the boat to climb out of the water and get on plane.
You need to fix the tach and see what the motor is turning before you try anything else. You can't look on a chart or table to figure what prop you should have - the "boat" needs to tell you that (via the tach).
Second - expect to have to put a bit of work into your (new) rig.
The previous owner didn't sell it because it was "perfect" - if it was, it wouldn't have been for sale.
Might simply need a tune-up, new plugs, de-carb etc to get it back into shape or it may need a prop swap if the motor is working too hard...
Since you don't have a tach my best guess is that the prop has too much pitch. A 150 on an 18' boat like yours might turn a 22" pitch ok, but you really need to get your tach working.
I would perform a compression and spark test. Read the spark plugs you remove...they can tell you what each cylinder is doing. Plug electrode should be brown, black is too rich, white is too lean, and a clean plug is either not firing or getting water in the cylinder. Be sure to check for waterlogged flotation foam and waterlogged transom, stringers and floor. A heavy boat won't move well.