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Author Topic:   17' SS Repower
Bobber posted 09-17-2001 11:13 PM ET (US)   Profile for Bobber   Send Email to Bobber  
I have a 1984 17 SuperSport with a 1985 Johnson 90 VRO. The motor is still strong & reliable but the TNT is out again so rather than dig it out I'm considering a new engine. The Yammy 90 seems the most logical choice but for cost considerations I'm looking at the Johnson 70. Yes, engine weight is important to me as I have a 20 gallon livewell mounted just aft of the bench locker. (Yes, both batteries are under the front bench) I'm not interested in top speed so much as achieving 30mph cruise with maximum fuel economy (18 & 6 gal tanks) while minimizing the new engines weight and cost. Any thoughts on the J70 or is there another engine I should consider? Many Thanks for all the great imfo and ideas I've found here.
JBCornwell posted 09-17-2001 11:29 PM ET (US)     Profile for JBCornwell  Send Email to JBCornwell     
Hi, Bobber. In my opinion and experience, 70 is the ideal power for a 17'. I had OMC 70s on my 16s and I have a Suzi 70 4S on my Montauk. Cruises at 30-33 (5000rpm) and WOT at 36-38 (5800rpm).

Red sky at night. . .
JB :)

Clark Roberts posted 09-18-2001 06:35 AM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
Bobber, there is a small performance advantage with the 90 Yamaha. I have had several 17's with 70hp OMC's and Mercs and four with 90 Yamahas and all performed well.
Either will give you great economy and weight is not an issue.. my choice would be a 70hp but you can't go wrong either way!!
george nagy posted 09-18-2001 12:53 PM ET (US)     Profile for george nagy  Send Email to george nagy     
In either case the 3cyl configurations for both engines are great efficient motors compared to your heavy v4 omc cross flow 90. I would say if you don't want to pull large wakeboarders around then the 70 johnson would be a great choice. I had a 70 hp on my 15' sport and it was terrific. I think omc/ bombardier hold up in salt better than yamaha. The plus with the johnson is that you can use your existing controls. Big savings there plus yamahas are a little too marked up for me. You might be able to find a leftover 2000 or 2001 johnson at a great price. I think that you may be able to use your prop too! I've been in the same repowering "boat" as you and I think I will stick with "omc" for the convenienc factor.
Good Luck!
Bobber posted 11-14-2001 12:52 AM ET (US)     Profile for Bobber  Send Email to Bobber     
An update on my repower- I found a leftover 2001 J70 in box for 4100 and of course used the money saved to install all new controls,cables, wiring, VRO tank and even got that little "idiot light" gauge too... oh well, at least I was able to use my SSII 13 3/8 x 17 and spare aluminum props. Traded the old J90 for the install labor and it is now learning some interesting Spanish phrases on the back of a shrimper down in Biscayne Bay.
You guys were dead bang on for performance- With me, 12 gals. fuel, 2 batts, 14 gal. livewell, etc I got 36.8 mph @ 5900 rpm.
I do like this engine, sad to think that it will no longer be made.
Thanks again for your learned input, I look forward to your possible replies to my future questions regarding poling platform installation and bow rail modification for trolling motor use.
Bigshot posted 11-14-2001 10:40 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Not a bad deal my friend. cheapest I have found a 90 Yamie is $4700 delivered but no controls or anything.
Bobber posted 11-15-2001 12:14 AM ET (US)     Profile for Bobber  Send Email to Bobber     
Right place at the right time, although my Fishing Permission Officer is cheesed that I still spent my entire 5 G's repower budget: you think she would know better by now. The dealer actually made out quite well as he immediatly reinstalled all my old rigging and engine on a commercial boat for 1 G.
I would still prefer to have gotten the Yammy 90 but I couldnt figure which of my 4 kids not to feed for the rest of this year!

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