Repower or not ?

[fishmonkey]

I have a 2000 Yar craft SC with a honda 130 hp its a honest boat good hull but I cant stand not going faster . Its a 42 MPH WOT boat when loaded light 1 guy tackle as soon as you put a load on it, 2 people with fuel livewell you're at 35 is where it wants to cruise about 5100 RPm .
I was told some people have 150hp on this boat and I willing to repower rather than making the plundge for a new boat but how much more speed will I be gettting with a 150 Hp ? Can I expect to hit 50 MPH and cruise in the mid 40"s ?
Thanks
Fishmonkey

[turtle chain]

Its all about the $$ and and it wont work out money wise you would be better off selling??That said if you would go with a 150 175 merc pro XS or a used 2 stroker you will get the mph you are looking for.I feel your pain I hate an under powered rig the boat must perform well with a heavy load , it should jump up on plane asap Bottom line good luck

[Just One More Cast]

I have a 1990 Yarcraft 1875 SC with a 2002 80hp four stroke Yamaha on it. Completely empty (other then operator & fuel) it does 37. With all my stuff (incl. 5 deep cycles, 2 trolling motors, 16 rods, tackle, 3 locators, tools, props, anchors...) it does 34+ now. Just yesterday I raised the motor on the transom to the last hole. Before that it was 32. I'm also going to go work with the 15, 16, 17 & 19 pitch props to dial it in.
It sounds like you need to do some research on engine mounting (where should cavitation plate be at full throttle?) & ask the Propmann on what prop to use.
Squeeze all you can out of what you have because I don't think you'd be satisfied for what it would cost to move up just 20hp.

[fishmonkey]

Originally Posted by Just One More Cast

I have a 1990 Yarcraft 1875 SC with a 2002 80hp four stroke Yamaha on it. Completely empty (other then operator & fuel) it does 37. With all my stuff (incl. 5 deep cycles, 2 trolling motors, 16 rods, tackle, 3 locators, tools, props, anchors...) it does 34+ now. Just yesterday I raised the motor on the transom to the last hole. Before that it was 32. I'm also going to go work with the 15, 16, 17 & 19 pitch props to dial it in.
It sounds like you need to do some research on engine mounting (where should cavitation plate be at full throttle?) & ask the Propmann on what prop to use.
Squeeze all you can out of what you have because I don't think you'd be satisfied for what it would cost to move up just 20hp.

Hmm are you sure a 1990 1875 SC ?You mean the old storm 1895 you getting that with less than a 3rd of the HP rating !! wow I am living wrong. Im doing something wrong.
Your getting more out of your boat than the Yamaha performance test is getting with a new 1785bt with a new 75 Hp on it .
Research Im on it ..

[turtle chain]

I know nothing about the boats you guy's are running?? how long and wide weight.My rig is 19 ft 99 wide with a 175 pro xs and light she will hit 54mph on a good day( 47mph heavy load 4 guy's) (38-40 mph really loaded down 6 guy's) If you run with lots of people and gear there is never enough power.And if you ski and wake board or bare foot you will need a ton of power also bottom line is more power= better fuel$$ if you run your under powered rig at full throttle or your big motor at half throttle do the math bigger is always better if you can afford it good luck

[Just One More Cast]

Oop's....That's a 1781 SIDE CONSOLE, 17', 850 lbs. (1600 lbs. with Me, 1/2 fuel, motor & battery) got 37, but not sure since I raised to 4th hole and not going to unload it to find out

Sorry, I spent 16 hrs. on the water yesterday and still suffering from the wind wobbles. :/

Mine is closer to this:
http://www.yamahaoutboards.com/sites...0dv-f75tlr.pdf

[jrdonicht]

5100 is on the low end of your rpms. Honda 130 is 5000-6000 rpm range. With a four stroke you want to be on that upper end. I believe you could have alot better performance with the right prop. I would give Ricky a call[propman] Cheaper than repowering

[Just One More Cast]

Originally Posted by jrdonicht

5100 is on the low end of your rpms. Honda 130 is 5000-6000 rpm range. With a four stroke you want to be on that upper end. I believe you could have alot better performance with the right prop. I would give Ricky a call[propman] Cheaper than repowering

My Yarcraft 1781/F80 Yamaha went up 2000 rpm & 2+ mph by raising the motor on the transom 4". I did a You-tube search on correct mounting and saw how the cavitation plate is supposed to run at WOT. It's at 5500 rpm now. Now for the prop trials. I've got a 17 on it now and have a 15 & 16 to try. I've never seen 6000 out of it but I'll get there!!
I think the old saying is "I'll squeeze 'er 'til she s***s!!

[Lund1993]

I agree waste of money for an extra 20hp.

[staylor]

...and assumed a best case scenario of going to a Merc 150 Pro XS Opti putting out 165 hp- the upper limit of the allowable for a 150 hp rating. I also assumed your current Honda was a bit "tired" at 120 hp. In this case, with no other changes, I calculate that you will go from 42 mph to 47.8 mph. In a more normal case, going to 150 hp from 130, the gain is smaller, to 45 mph.

These computations assume that the engine stays at the same height, and the Merc is propped with the same style of prop you are now running.

I agree with Just One More Cast's post that for a first step you should try raising the engine first, which should gain you speed from both the reduced drag on the lower unit and get the engine a bit higher into its power band- as jrdonicht posts.

I've always maxed out the power on my rigs, just so I never get into the expensive "what if's" of a motor change.
Doug