2015 Sweetwater 240 SLR Tritoon w/Yamaha F200 Motor

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JBizzle
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Joined: Tue Jun 11, 2019 7:33 pm

2015 Sweetwater 240 SLR Tritoon w/Yamaha F200 Motor

#1 Post by JBizzle » Mon Mar 23, 2020 9:22 pm

Hey - Recently bought the above from a friend who moved out of town.  I've been on it previously doing 35mph, on my maiden voyage under my ownership however, she's only pulling 25.  Things to note:

- The bottom is absolutely filthy (winter sat in lake water)
- It has a replacement prop recently (yet to get my hands on the old one to determine if its the same pitch, will have it soon)
- 25" toons I believe

She pops up on the plane nicely around 15, accelerates up to 25 reasonably enough, balancing trim as I go etc....  then that's all she has, rpms around 5300ish maybe, WOT.    Trimming in at that speed doesn't massively slow it - then engine just works harder (you can hear that hollow intake type noise), trimming out results in more rpms, but no massive speed gain - assume it's cavitating slightly.

Can dirty toons really knock 10mph off the speed?
Trying to understand if it's the filth, possible wrong prop or engine issue.

I read forums hearing of easy 40+mph speed from seemingly similar boats with like 150hp motors... I was honestly expecting this would pull 40 in the right conditions.

Appreciated in advance!

Steiner
Posts: 390
Joined: Thu Aug 01, 2019 7:51 am
Location: Lyman, SC

Re: 2015 Sweetwater 240 SLR Tritoon w/Yamaha F200 Motor

#2 Post by Steiner » Tue Mar 24, 2020 5:54 am

I think the most common standard prop on the F200 is the stainless Reliance 14-1/2 x 15 which is what I have on my G3. Are you using GPS or the boat speedo? You should be able to hit 25mph around 4000 RPM and top out around 6000RPM and 40mph range. Gunk will indeed slow it down. Here's an example:
http://club.benningtonmarine.com/thread ... ubes.4620/

Here are some performance bulletins for the F200 on Godfrey tritoons, one of them uses a 14" prop for some reason.
https://yamahaoutboards.com/en-us/home/ ... -10-10_pnt
https://yamahaoutboards.com/en-us/home/ ... -09-12_pnt
https://yamahaoutboards.com/en-us/home/ ... -08-30_pnt
2019 G3 SunCatcher V322 SS tritoon, Yamaha F200
2019 F-150 XLT SuperCrew FX4, 3.5L EcoBoost Max Trailer Tow Package

JBizzle
Posts: 4
Joined: Tue Jun 11, 2019 7:33 pm

Re: 2015 Sweetwater 240 SLR Tritoon w/Yamaha F200 Motor

#3 Post by JBizzle » Tue Mar 24, 2020 8:34 am

Thanks for the info and links - hopefully the clean sorts it out.
I was measuring on the GPS

Steiner
Posts: 390
Joined: Thu Aug 01, 2019 7:51 am
Location: Lyman, SC

Re: 2015 Sweetwater 240 SLR Tritoon w/Yamaha F200 Motor

#4 Post by Steiner » Tue Mar 24, 2020 11:12 am

You bet.
Good luck. Cleaning is a whole lot cheaper than a prop.
2019 G3 SunCatcher V322 SS tritoon, Yamaha F200
2019 F-150 XLT SuperCrew FX4, 3.5L EcoBoost Max Trailer Tow Package

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steve1313
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Re: 2015 Sweetwater 240 SLR Tritoon w/Yamaha F200 Motor

#5 Post by steve1313 » Wed Mar 25, 2020 3:43 am

A dirty boat will certainly slow down, but I would think the RPMs at WOT would still be pretty close to the same no matter whether the boat is clean or dirty, but somebody here who knows more about props than I do may say I'm wrong (and I might be!!).

Regardless of the cause, 5300 RPM at WOT isn't enough. I'd bet the new prop is a different size than the old one!
Steve
"Serendipity" - 2017 Sweetwater 2286 WB Tritoon w/ 150HP Yamaha
Slipped at Lake Anna, Virginia
Primary Residence: Richmond, Virgina
Lake House: Lake Anna, Virginia

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jrolin1
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Location: Lexington SC Lake Murray

Re: 2015 Sweetwater 240 SLR Tritoon w/Yamaha F200 Motor

#6 Post by jrolin1 » Wed Mar 25, 2020 4:33 am

Definitely clean it first. 10mph loss due to drag sounds reasonable. Also with the extra drag your rpms WOULD be lower at WOT. I would not change anything until it is clean. Then evaluate.

Steiner
Posts: 390
Joined: Thu Aug 01, 2019 7:51 am
Location: Lyman, SC

Re: 2015 Sweetwater 240 SLR Tritoon w/Yamaha F200 Motor

#7 Post by Steiner » Wed Mar 25, 2020 6:39 am

Oh yeah one other note you probably already know about but that F200 is one of the few that Yamaha recommends 89 octane minimum....not that that has anything to do with what you're seeing now. From reading, most people don't notice any difference on 87 in regular running around. They don't come right out and say "required" but you're not gonna get the full 200hp on 87 because it'll likely pull timing due to knock at high loads. I think the 175 is basically the same motor without VCT and recommends 87 minimum.
Last edited by Steiner on Wed Mar 25, 2020 6:41 am, edited 1 time in total.
2019 G3 SunCatcher V322 SS tritoon, Yamaha F200
2019 F-150 XLT SuperCrew FX4, 3.5L EcoBoost Max Trailer Tow Package

JBizzle
Posts: 4
Joined: Tue Jun 11, 2019 7:33 pm

Re: 2015 Sweetwater 240 SLR Tritoon w/Yamaha F200 Motor

#8 Post by JBizzle » Wed Mar 25, 2020 6:40 am

Thanks guys - will update this thread once i manage to get her cleaned... yard closed at the moment.

JBizzle
Posts: 4
Joined: Tue Jun 11, 2019 7:33 pm

Re: 2015 Sweetwater 240 SLR Tritoon w/Yamaha F200 Motor

#9 Post by JBizzle » Fri Mar 27, 2020 10:42 am

Steiner wrote:
Tue Mar 24, 2020 5:54 am
I think the most common standard prop on the F200 is the stainless Reliance 14-1/2 x 15 which is what I have on my G3. Are you using GPS or the boat speedo? You should be able to hit 25mph around 4000 RPM and top out around 6000RPM and 40mph range. Gunk will indeed slow it down. Here's an example:
http://club.benningtonmarine.com/thread ... ubes.4620/

Here are some performance bulletins for the F200 on Godfrey tritoons, one of them uses a 14" prop for some reason.
https://yamahaoutboards.com/en-us/home/ ... -10-10_pnt
https://yamahaoutboards.com/en-us/home/ ... -09-12_pnt
https://yamahaoutboards.com/en-us/home/ ... -08-30_pnt
I currently have this prob: https://www.propellerdepot.com/solas-ne ... 45-15-prop

So inline with those you suggested above.

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