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Neil 74
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| Posted: 09/05/2009 at 1:27pm | IP Logged
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Yamaha offers a 15,20 an 25 inch shaft length, what would be proper for a 1990 Fiesta Pontoon.
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1990 Fiesta 18ft
1994 Yamaha 50hp
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Wildcat Dude
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| Posted: 09/05/2009 at 1:31pm | IP Logged
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20, the reason why that is, it's because newer toons are much larger than older toons (with a few exceptions). Therefore those would sit higher in the water, especially if they are tri-toon configurations. (again just my observation and opinion) 
Edited by Wildcat Dude on 09/05/2009 at 1:34pm
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Charles - TN
93 Voyager 20ft
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Neil 74
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| Posted: 09/05/2009 at 2:09pm | IP Logged
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Thanks again Wildcat Dude, I just checked my Yamaha 50hp and I have a measurement of 23 1/2 inches from top of transom to center line of prop. Was told it was a 1994 Model ES, may be more on tag but damaged an can't read. My freeze plug has # D81950 on it, is there anyway to confirm shaft length and year from this info? I also have an Evinrude 60hp 3 cylinder that measures approximately 28 inches from transom to centerline of prop. I believe to be an 87. This Fiesta is rated for a 50 hp max. Would it hurt to hang the Evinrude on it rather than cutting down transom for only available 2-3 inches to lower Yamaha. Both engines on last mounting holes an low as they will go.
Edited by Neil 74 on 09/05/2009 at 2:11pm
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Wildcat Dude
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| Posted: 09/05/2009 at 3:06pm | IP Logged
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Easy to tell on Johson and Evinrudes, just read the J or E numbers on the freeze plug and compare it to here http://www.theoutboardwizard.com/evinrude_model_number.html and for the Yamaha you can find some info here http://www.boats.net/parts/search/Yamaha/Outboard/parts.html by looking at your model number
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Charles - TN
93 Voyager 20ft
84 Johnson 115HP
68-77 USAF SP-K9 Vietnam 69 & 70
Retired Detective 94
www.ezacdc.com (for wiring)
www.backtoboating.com (good stuff)
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Neil 74
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Once again Thanks Wildcat Dude:), Sites are appreciated an saved.
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rickdb1
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| Posted: 09/05/2009 at 10:18pm | IP Logged
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Neil, the shaft length measurment is taken from the transom to the cavitation plate on the motor, not the centerline of the prop.
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Neil 74
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| Posted: 09/06/2009 at 12:21am | IP Logged
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Thanks Rick, I realize that now, I was only referencing the fact that the Evinrude is approximately 5 inches longer so it is a long shaft. Would it be more reasonable to remove short shaft Yamaha 50hp and re-install Evinrude 60hp.Or would it help to lower Yamaha 2-3 inches? This Fiesta is rated for 50hp Max. I have a lot of turbulence in front of prop, would lowering help? Also on bottom of pod there are 6 rivet holes and evidence of another plate. Am I missing some kind of a water diverter from there?
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Wildcat Dude
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| Posted: 09/06/2009 at 6:19am | IP Logged
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Pics would definitely help clarify things. So why did you decide to lose 10hp in the swap? (besides being over-rated for your boat). As for lowering your motor, are you saying you have ventilation or cavitation problems with your current setup? Again pics of your transom area would help clarify
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93 Voyager 20ft
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Neil 74
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| Posted: 09/06/2009 at 8:49am | IP Logged
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Sorry for my confusing posts, I tend to ramble when frustrated:) The man I bought boat from seized his evinrude so he had the Yamaha installed at a marina. He only used this boat at very slow speeds in the canals to watch the sunsets with his lady friends, 82 year old playboy:) Any way I bought it an discovered problems at higher speeds. You saw my other two posts. First time out with new prop was perfect, second time out was good but coming in I was back to thinking new hub was spun. Long story short I removed it an took back to prop shop, they said no way to test it but... did not look bad to them. I traded another 3 blade prop for a 4 blade so I now have a spare, I will try it again this week. I have another Ebb-tide boat with an Evinrude on it it is a 20 inch shaft. The reason I am considering this swap is because 4 people have told me my 15 inch Yamaha does not belong on a pontoon boat. They believe it is cavitating under choppy seas and when the grass is floating. The explanation I have heard is when you have to run a short shaft all the way in it needs to be in water deeper. You have seen the pictures under power . This thing is putting up a good fight but I am determined to win in the next round or two Neil74
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| Posted: 09/06/2009 at 9:51am | IP Logged
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They are right, a 15in is just too short for a pontoon boat unless you've got one of the little small pontoon boats (14ft or smaller, maybe some 16's). Also a 4 blade prop isn't for a pontoon boat, so trade it back for a 3 blade. Hope that helps.
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93 Voyager 20ft
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Retired Detective 94
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Neil 74
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| Posted: 09/07/2009 at 7:26pm | IP Logged
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Really hate to hear that Wildcat Dude, this Yamaha runs really good. The 4 prop was loaned so I can try my 3 blade again an if still seems to slip, I can put on the 4 blade to see if in fact there is a difference. The short shaft on a pontoon is another story. I have read a few topics where people were going to try an aluminum jackplate for using a long shaft on a short transom, but no one followed up with did it work or not. If it would be possible to re-drill an put on upside down, I could get a pieceof 4 inch channel an make a pair. If not other than 10 hp over rated size do you see a problem putting Evinrude 60 on. The measurement only shows it as an 18 inch length tho.
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rickdb1
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Using a long shaft on a boat made for a short shaft is usually no problem with a jackplate. But using a short shaft motor on one intended for a long shaft doesn't work out well because the powerhead winds up being too low to the water and the cowl may actually hit when turning if lowered too much. If you really like the engine, I would say look on Ebay for a 20 inch lower unit and then sell yours to make up the cost.
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Neil 74
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| Posted: 09/07/2009 at 8:55pm | IP Logged
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Thanks guys looks like I've really taken a beating on this toon Jumped right in with both eyes closed. Maybe I'll learn one day, maybe.
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tsfelt
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| Posted: 09/09/2009 at 8:59pm | IP Logged
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Neil, just for reference:
I have a 75hp long (25 inch) shaft on a 20' toon, and I recently replaced the motor with one identical but 2 yrs. newer. The first motor was mounted as low as it would go, approx. 29 inches from transom to prop center line, and it did good most of the time with just me, the boss, and 2 dogs aboard. When we had guests, I'd notice with the front lower, it would cavitate easier when the rear of the boat comes up.
I dunno what I was thinking, but when I put the new(er) motor on, I mounted it 1 notch higher on the transom, about 28 inches.
Big mistake....now it starts to cavitate in smooth water at about 10 mph, and gets worse the faster I go. At full throttle, it will over-rev the motor when it comes up higher in the water. I'm lowering it ASAP. I'm not sure about others, but my boat reuns best with the prop as low as I can get it.
I've also found the bigger the prop diameter, the better, or you'll just waste gas revving the motor up to full throttle and going 8 mph - it happened to me with a 10 inch diam. prop. Currently I use a 12 inch diam. x 10.5 pitch prop, which is the highest pitch prop I can find in that diameter.
**Clarified inches as the forum software doesn't recognize the normal symbols**
Edited by rickdb1 on 09/09/2009 at 9:16pm
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Neil 74
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| Posted: 09/10/2009 at 11:18am | IP Logged
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Thanks tsfelt,
I have begun switching motors, I sure hope this is not a waste of time an money installing a 2o inch Evinrude:), but that would be my luck and exactly like everything else on this wonderfull pontoon. At least I can still hope an keep repeating, ' I'm sure glad I finally got me a pontoon, now I can go fishing'
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Wildcat Dude
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| Posted: 09/10/2009 at 11:54am | IP Logged
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You can always call it a learning experience , I've done a lot of that on my toon.  
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Charles - TN
93 Voyager 20ft
84 Johnson 115HP
68-77 USAF SP-K9 Vietnam 69 & 70
Retired Detective 94
www.ezacdc.com (for wiring)
www.backtoboating.com (good stuff)
www.boatingseats.com (seats)
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tsfelt
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Neil and Wildcat:
What size props are you guys running? Just curious
Edited by rickdb1 on 09/10/2009 at 11:20pm
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Neil 74
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| Posted: 09/10/2009 at 11:08pm | IP Logged
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I'm running a three blade Yamaha prop, it's a 12 1/4 X 9 that was rebuilt by the Prop shop, he put a little extra cup in it. Have the Yamaha off an on the Ebb Tide, the Evinrude is off an will replace seals in bottom leg an water pump. It will be on tomorrow an both controls will be switched. Hope 5 inches will be enough :) heck thats the story of my life:))
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Wildcat Dude
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| Posted: 09/10/2009 at 11:50pm | IP Logged
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14x11
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Charles - TN
93 Voyager 20ft
84 Johnson 115HP
68-77 USAF SP-K9 Vietnam 69 & 70
Retired Detective 94
www.ezacdc.com (for wiring)
www.backtoboating.com (good stuff)
www.boatingseats.com (seats)
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PontoonStuff Forum : Everything About Pontoon Boats
Topic: Shaft length (
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