worn out 150's

#1 11-11-2005, 12:02 AM

I just purchased a 78 23cc that has a pair of x-flow 150 johnson's that have are still running but worn out, won't idle etc, not worth overhauling. The boat runs pretty good with the worn out 150's 40mph at 4200 rpm, any way due to my limited budget a new motor is out of the question, but I have found a pair of '96 90hp johnson's that have very low hours and are affordable just not shur how the boat will perform with this config. wondering if any one has any experience with a pair of small 4cyl john/evinrude's on the 23 cc ?

Finster · #2 11-11-2005, 12:30 AM

scothawk55, I would have to say your going to be under-powered with those. If I were you I'd hang tight til you could find something in the 135 to 175 range (for twins) or a single 225-250 single. I think the boat would be hard pressed to preform well with 180hp.

That should give you plenty of time to do cosmetic's. [img]/images/graemlins/grin.gif[/img]

#3 11-11-2005, 12:46 AM

needs some cosmetic's, but not to bad for its age, already paid a friend/glassman to take care of the ugly. dying to go fishin in that boat had a 20' robalo before this, never have i had or been in a better riding boat than the 23cc plus the weather here in galevston tx is just gettin perfect for fishin low 80's.

#4 11-11-2005, 01:33 AM

also these are the original 150hp outboards that came with this boat and i saw on the spec sheet on classicseacraft.com showed the 23cc was offered with twin 70's 85's 115's and so on, also these hp ratings were at the power head not the prop, I would love to do a major overhaul to the boat but us blue collar guys gotta take what we can get or what she'll let us get.

Finster · #5 11-11-2005, 01:51 AM

That's a tough call. The twin 90's ill give you enough torque to get upon plane. Try it, you'll be the first I know of with that kind of HP on a 23. [img]/images/graemlins/confused.gif[/img] At a guess I'd say you'd top out at 28-30kts and cruise at 18-20kts, best case scenario.

WillyC · #6 11-11-2005, 11:48 AM

How about the 250 Yamaha in the for sale section of this site. Its got everything you need.

PipeDreamsMarine · #7 11-11-2005, 01:06 PM

Scothawk55, go with the twin 90's.. the 150's in 78 were rated at the power head so you looking at maybe 120 at the prop when they were new. The 90's are rated at the prop so, yes they are less power by 30hp but less weight by at least a hundred pounds each motor. I say its a closer swap then what others may think. I'm sure you'll see a top end well in the 30's and a nice 24 to 29 knot cruise with those motors. plus your fuel burn will be better then those old loopers. I took a 1975 115 off my 19 and put an 1989 88slp and only lost two knots..

Finster · #8 11-11-2005, 06:35 PM

Once again the flux fumes have gone to your brain. You do realize your going to owe me a case of beer over this. Your numbers aren't even close.

#9 11-11-2005, 11:51 PM

I own a 90 225 johnson and have access to a 250 yamaha for a good price but after a few trips with the old 150's and coming home on 1 motor both times I just really think i want to have twins and according to the performance data spec sheet, that I assume was a original seacraft document, the 23cc that came with 115 omc 4cyl's had a top speed of 42 mph and those 78 115's were making 100hp at best at the prop. I know the 90's will work, and do better than 30mph, I was simply trying to get feedback from someone if there is any one that has had experience with small hp 4cyl john/evinrudes on a 23. And there is a 45lb difference between the 4 & the 6 cyl omc's and as I stated the boat went 40 at 4000 rpm's with the 150's that have a whopping 80 lbs of compression across the 12 cyl's and pipedreamsmarine is correct about the 150's making 120hp at the prop new and with 80lbs of comp. maybe 100hp granted the 6's even worn out will make more torque I am convinced the 90's will make 40mph wot and cruise at an easy 28-30mph

Snookerd · #10 11-12-2005, 12:23 AM

Hey Scothawk55- I agree with twins for offshore and cruising will be acceptable with the 90's. I understand that original specs called for power packages like what your planning. I'm on the side of the ideal set-up being twin 200's on a Seamark bracket, but like you said budget decides your plan. Finster may be buying Don a case of beer if he loses his bet. Also, you gotta remember that it's 32 degrees at Finny's house and when he hears that your fishing in 80 degree weather, and he is looking at scrapping ice off the windshield tomorrow AM, your going to get a bad attitude [img]/images/graemlins/grin.gif[/img]