Something sounds way off. You should be able to turn at least 4,400-4,500 rpm and the speed should touch 60 with little drama.

Tell us more about the boat and tune.

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My money is on a stuck mechanical advance. You really need to know the ignition timing above 2,500rpm.

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Does it have and loader?  What about shoe and ride plate?  Its possible the hardware is hanging too low and creating too much drag.  Does your Place Diverter have inserts?  If so, what color insert?

Please post some pictures of the entry into the jet from the side and front.  If you have a shoe and ride plate, lay a straight edge along the keel from a few inches from in front of the intake and measure the depth of the biting edge of the shoe.  The biting edge of the shoe should be approximately even with the keel.

Its possible that you somehow ended up with a larger impeller than an A, or your engine is down on power.  Is the engine all stock?

Cheers,

Joe

Here is the side view of the intake

Yep I have a timing light that displays rpm as well so I can verify the tachometer on the boat. Gonna drop the boat in the pond here in an hour or so and I'll post my results . Gonna play with timing and record my new gps speed against current timing (unknown at moment) to proper timing ( 32-38°). Also gonna check my secondary on the carb at wot

Dude I have same setup in the 18ft southwind I have - it runs 65 all day with points ignition and 750 carb. It's .30 over with a mild cam. But other than that it's pretty stock. My timing  ended up around 32 degrees but my timing numbers only went to like 0-30 degrees  in the front of the motor. I made my own little white mark for reference. Good luck


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Well just pulled off the water, fuel pressure was good @7psi . Timing was at 18° btdc. Once I corrected the timing and set it to 32° ish. Got me a top speed of 55 on the gps. Secondary working well and all linkages fully operating.  Boat felt significantly faster and produced much more of a throaty sound. So with all that adjusted is that pretty much all I'm looking at for top speed? Now I'm thinking it must have a lower geared impeller. Was able to achieve 4600 rpm as compared to 4200 rpm .

Throw in 4 more degrees of timing.

She wants some lead off.

It shouldn't hurt anything. Listen for a ping.

Awesome.

GT

Thanks for all the helpful advice. Much more prepared for parker now! 👍