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I have a 1974 (full transom) 13' Sport hull. I have an opportunity to purchase a decent used 1996 C40 (40hp) Yamaha that the guy thinks is a 25" shaft.

Will a 25" shaft motor work on a 13'? What I mean is, what is the factory recommendation? I assume a jack plate could make it work, but I'd rather not go that route.

Thanks in advance for your help!!!

Bruce

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I doubt it is a 25" engine. If it was close to you I would go and measure it. I would not buy it if it is a 25" shaft. A lot of people selling used engines don't even know what shaft lenth they have. I just bought a 40 hp tohatsu that sat in his garage for 14 years that never was mounted on a boat and he advertized it as a short shaft but by looking at the photo of it I was sure it looked like a long shaft. I went and measured it and sure enough it was a long shaft. More than once on ebay or craigslist I have seen long shaft engines mounted on a 13' whaler with the short transom. What a surprise when the new owner takes it for the first ride. Go measure the engine for yourself to be sure. Good luck.

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After looking at the Photo of a C 40 Yamaha mounted on a pontoon boat for sale I have to admit It could be a 25" shaft. Tohatsu made a lot smaller engines for overseas markets with 22" and 25" shafts. Evinrude makes a 65 hp E-tec engine with a 22" shaft that they sell in Canada. I would still check it out and take a measurement of a long shaft engine to compare it with. Sometimes it ain't what you don't know that hurts you, it's what you know that just ain't so. Good luck.

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Tom -- this is the engine on craigslist. this might be the one you were looking at..? it looks at least a 20" to me. but, yes, i do need to measure it to find out. trouble is, he's about 2 hours from me...

http://richmond.craigslist.org/boa/2369912882.html

Thanks!

Bruce

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Yes I did see it on craigslist. You might ask him to measure it before you drive out there and then check it yourself. Yamaha made a line of bare bones engines that did not even have oil injection. The C series does not have oil injection. they made a C 85 which was basicly a 90 and did not have oil injection. Like I was saying it could even be between 20" and 25" shaft lenth so be carefull how you measure it.

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Cool. Will do. So, what is the Boston Whaler factory approved shaft length for a full-transom (post-1972?) 13' hull? Is it 20"..?

Bruce

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Here is a FAQ on 13' models.
http://www.whalercentral.com/viewpage...age_id=155

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Joe - THANKS! I was looking for that info but I guess didn't look hard enough. Thanks again!

Bruce

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One last follow-up to my original question (for anyone who cares besides me!):

Per a Yamaha Outboard forum (and confirmed by a Yamaha certified mechanic, the "L" in the model #, C40PLRU, represents a "long" or 20" shaft. If they made a 25" shaft for this horsepower, the model # would have been C40PXRU, where the "X" represents "extra long". And now you know... the rest of the story :)

So, I'm going to go see if this motor is worth the mnoey!

Thanks, everyone!

Bruce

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These seem to be fairly standard among the manufacturers.
L = 20"
X = 25"
XX = 30"

Where XX means "Extra Extra Long"

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A quick update: I purchased a 1996 Yamaha 40 hp (model: C40PLRU) for my 13' Sport. I went to look at it Saturday and after running it through its paces, checking compression (135psi in both cylinders), and the owner (who is a certified Yamaha mechanic) throwing in 5-gal of Yamalub oil, I carried it (and the side-mount controls) home. I'm pretty stoked. I didn't think I'd find what I was looking for this season, so it looks like I should be able to get it back on the water soon.

Now, I just need to get it mounted and rigged.

Thanks again for everyone's help!

Bruce