whats your Top End on 23s

[Old'sCool]

Is that transom mount or bracket??

[Bigshrimpin]

'05 23' Seacraft twin 150 yamaha HPDI's, props spun in, 14 1/4" x 21 Rapture props, manual 6" setback jackplates, group 27 AGM batteries, water bladder, oil tanks moved forward of console and below deck level, full fuel (146 gallons), 53 mph at 5300-5400rpm/ 28.5 gallons/hr total. 40mph at 4000 rpm/16 gallon/hr; 45mph at 4500rpm/19.5 gallons/hr; Before moving weight forward and lower and jack plates had the boat at 56mph when light on fuel, squirrely ride/not smooth in rough seas/had to be going >30mph to get or stay on plane

Change those props . . . to a stern lifting prop. Those rapture props are not a good match for seacrafts. Mirage Plus.

[Fishjack]

reelescape1 - if you are referring to my post I am running a D&D bracket...

[Old'sCool]

reelescape1 - if you are referring to my post I am running a D&D bracket...

Yep...Sounds like we have similar set-ups. Any chance you would measure your engine location?? Like anti-cav. plate to hull bottom,mounting setback, and what hole is it mounted? I'm not getting that speed (motor runs great!), same prop....I think mine needs to come up!

[askipper3]

My 20' has the 150 merc, and runs about 38 tops. I thought this was a little sluggish. No?

I was thinking of changing the carbs out and making it 200 hp. But then I would burn gas even more!

[Fr. Frank]

If you have a 150, and are running 38 mph, you're doin' okay. The 150 and the 200 are different blocks in most years. You can upgrade a 150 to 175 by changing a few parts and making a few adjustments, but you can't just change the carbs and get 200 hp. I have a 150 xR4 motor that was remanufactured with a variety of parts to make it better, and I was thrilled to get 190 hp. My Seafari 20' will top out at in the high 40's even loaded for fishing.
I have decided my next motor (2 years to go and counting) will require a transom modification like a flotation bracket, and will be a 4-stroke 250 hp Suzuki. I have put my bartered deposit down on a left-over 2006 from a local boat mfg., and will be paying it off over the next 2 years.
It will cost me $8100 including controls.

[askipper3]

, expensive! But worth it~

Ok, so lets say 175. Would that take a beatign on my gas tank...or just really improve my performance...or neither?

Ive topped 35-36 knots. Thats actually 40-42 mph!

My bad on the 38. I guess Im happy with the speed but I like to have plenty of power.....

[askipper3]

expensive! But worth it~

Ok, so lets say 175. Would that take a beatign on my gas tank...or just really improve my performance...or neither?

Ive topped 35-36 knots. Thats actually 40-42 mph!

My bad on the 38. I guess Im happy with the speed but I like to have plenty of power.....

[gss036]

1989 23WA w/89 Merc 200, low 40's. Test sheet when I bought it said 44 MPH running 14 1/2X 17 Alum prop. I am running 14 1/2 X 17 stainless Merc/w slight cup and am getting about the same results. Don't run WOT @ current gas prices. Cruise @ 4200 rpm @ 32 mph on rippled water.