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  15HP Yamaha 4-stroke on 13' Whaler Sport

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Author Topic:   15HP Yamaha 4-stroke on 13' Whaler Sport
Jim Bo posted 09-04-2002 01:49 PM ET (US)   Profile for Jim Bo   Send Email to Jim Bo  
I have just purchased a 15HP Yamaha 4-stroke w/remote controls for my '81 Whaler 13' Sport. I know this seems like a small motor, but 95% of our use is in a no-wake zone. We probably put the boat on plane 5-6 times a year. The issue for us was weight because when we leave the boat unattended for long periods, we pull the drain plug out. If the engine were too heavy, this wouldn't work as well as it has been working for us over the years.

Does anyone have any experience with this combination of boat and motor? Will it plane with one or two people in the boat? I have ordered a 9 1/4" x 8" prop (the lowest pitch they offer).

Thanks,

Bigshot posted 09-04-2002 02:02 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
You might need to make that prop a bit bigger but you can always add up to 2" of pitch. If a 10" is standard then the 8" should be fine. The 13 with a 15hp will do over 20mph so you will have the perfect setup for what you need. I have an older 25 on mine and she runs about 30 which is plenty fast on a 13. A 9.9 is a bit slow with 2 people so that 15 should be great.
Jim Bo posted 09-09-2002 08:48 AM ET (US)     Profile for Jim Bo  Send Email to Jim Bo     
I have now put the 15HP Yamaha on the Whaler. The boat DOES plane, albeit with some effort getting up initially, with two heavy people on board (one moving forward for a few seconds to facilitate the plane).
Actually appears that the engine might be over revving once it is up on a plane and moving along. Looks like the overall solution will work out fine.

Thanks for the help BigShot.

Jim

Chris posted 09-19-2002 09:11 PM ET (US)     Profile for Chris  Send Email to Chris     
HOW FAST DOES IT GO AND WITH WHAT KINDA LOAD?
11 footer posted 09-21-2002 06:16 PM ET (US)     Profile for 11 footer  Send Email to 11 footer     
So Jim bo
were are the #'s

11

thebone12 posted 09-21-2002 10:06 PM ET (US)     Profile for thebone12  Send Email to thebone12     
add doelfins, it will make it better!

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