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Author Topic:   Repower for '72 13'
egaito posted 01-14-2001 09:58 PM ET (US)   Profile for egaito   Send Email to egaito  
The '72 Johnson on my 13' is tired and too cranky for my wife to run on her own. I'm interested in replacing it with another 40hp, preferably a 4-stroke. At a recent boat show, two of the manufacturers reps told me that they didn't make a motor that would fit on that short of a transom anymore. Does anyone have any idea of what the shaft length should be? Any other specs I should be looking for? Recommendations are welcome.....


-Ed G.

bigz posted 01-15-2001 07:39 AM ET (US)     Profile for bigz    
Ed you need a 15" shaft or you can mount a jack plate and use a 20" shaft -- not my recommendation though --- take a look at this post and threads should shed some light on your situation -- Tom

egaito posted 01-15-2001 10:58 PM ET (US)     Profile for egaito  Send Email to egaito     
Thanks for the reply....I've been looking at the Honda 4 strokes. They offer a 16.3" shaft rather than a 15". Any comments on the affect the extra inch and a half will make?

Also, how well will the little whaler handle the 211lbs. of weight?

Thanks again,


whalernut posted 01-16-2001 05:12 AM ET (US)     Profile for whalernut  Send Email to whalernut     
Ed, the 72` hull is the older flatter hull and doesn`t require much horespower to run very well. I had a 35h.p. Evinrude on my 71` `13 Sport and it was plenty. The Honda 40h.p. 4-stroke at 211lbs. is very heavy, for example a Johnson 50h.p. 2-stroke weighs something like 180-190lbs. I think a new 50h.p. 2-stroke would be overkill on a 72` hull, you would probably be better getting under 150lbs. for an engine for that older style hull. I will be in the market for a 4-stroke someday for my 73` `16 Currituck, but will go with less than max horespower because of the extra weight of a 4-stroke. The Merc. 50-60 h.p. 4-stroker weighs about 250lbs, about the same as a 70h.p. Johnson 2-stroke which is about right for the older `16 hull(500lbs.) My old 75` 85h.p. Johnson weighs about 270-290lbs. I will lose horespower with the 50-60 h.p. 4-stroke, but shed some weight and benefit overall for my fishing needs, no smoke, use less gas, etc. Regards-Jack Graner.
Peter posted 01-16-2001 07:33 AM ET (US)     Profile for Peter  Send Email to Peter     
I agree with Whalernut. 211lbs on the transom is too much for the 13', particularly with the 15 inch transom. With that weight, you'll have a lot of wake washing into the boat over the transom if you slow down too quickly. Also, a 16.3 inch shaft length seems odd. If mounted in the conventional manner, the extra 1.3 inches will create more drag, which will slow you down. Your old 40 probably weighs about 140 to 150 lbs. My recollection is those old Johnson 40s were always a little cranky. Also, FYI, the hp rating for your old 40 was not at the propshaft. Under today's hp rating scheme, it would be less than 40 hp. You might get nearly similar performance from a 30 hp today. Hope this helps.
goldstem posted 01-16-2001 08:46 AM ET (US)     Profile for goldstem  Send Email to goldstem     
I agree with everything here. I had a 13 with an old johnson 40. My yacht club has an old 13 with a new johnson 30 (2-cyl) 2stroke and it runs better and just as fast as my old 40 did. I recommend it highly. 200lbs on the back of an old 13 is asking for trouble.
andygere posted 01-16-2001 03:04 PM ET (US)     Profile for andygere  Send Email to andygere     
Nissan/Tohatsu makes a short shaft (15") 2-stroke 40 hp with oil injection, power tilt/trim, electrict start. Here's a link to a dealer that has been posted elsewhere on this forum:

Peter posted 01-17-2001 09:37 PM ET (US)     Profile for Peter  Send Email to Peter     
In my youth I ran a 1977 35 Evinrude (substantially the same as the Johnson 30 2 cylinder described above) for a good 10 years on the back of a 13. Most of the hours were probably logged at nearly full throttle (back when my back could take a pounding or two). That engine was nearly bullet proof. Always used to beat the old 40s in a race. I think the reason was that the gearcase on the old 40 was not as hydrodynamic as the 35's.
egaito posted 01-20-2001 12:59 AM ET (US)     Profile for egaito  Send Email to egaito     
Thank you all for your responses. All the 4-strokes seem to be heavy, though Yamaha's weighs in at 181 lbs.....8 lbs. less than their 2-stroke 40.

I really want to stick with the 40 rather than a 30 as the boat serves as my "ski boat" in addition to doing dinghy duty.

-Ed G.

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