Sylvan tritoon speed

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Jcimabue
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Joined: Sat Feb 20, 2021 9:58 am

Sylvan tritoon speed

#1 Post by Jcimabue » Sun Feb 21, 2021 7:57 am

Hi everyone,
I'm new to the forum and looking for any advice you can provide.
I recently purchased a Sylvan L5 25'-10" tritoon with a 200hp Yamaha last year. The boat has no problem getting up on plane but seems to be lacking in top end speed. With 2 adults. no gear and a full tank of fuel(60gallons) it tops out around 25 - 27mph. This seems slow compared to other posts I've read about with other boat manufacturers.
Any input would be appreciated.
Thanks, Joe

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Marc K
Posts: 540
Joined: Fri Jun 01, 2018 4:35 am
Location: Eustace, TX

Re: Sylvan tritoon speed

#2 Post by Marc K » Sun Feb 21, 2021 1:20 pm

Hi Joe,

Welcome!

What is your RPM when running wide open at that 25-27 MPH?
Did you trim up to try to lift the front of the nosecones up a bit?

Marc
1999/2000 25' Crest II DL with Yamaha F115 4 Stroke

Jcimabue
Posts: 2
Joined: Sat Feb 20, 2021 9:58 am

Re: Sylvan tritoon speed

#3 Post by Jcimabue » Mon Feb 22, 2021 4:07 pm

Running 25-27mph Wot at 5200 Rpm and trimmed up.

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Marc K
Posts: 540
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Location: Eustace, TX

Re: Sylvan tritoon speed

#4 Post by Marc K » Tue Feb 23, 2021 3:34 pm

Check to see what your wide-open RPM should be. It seems to me that it should be closer to 5800-6000. If so, you may have too much prop which will "lug" the engine down and not reach full potential. Much depends upon the diameter and design of your pontoons and weight distribution front-to-back.

Yes, I would think that 30-35 MPH would be reasonable, but that would depend upon whether you can lift the nose cones up on the surface of the water. With my 25' two-tube boat and 115 HP, I cannot so you see my bow wake and laugh! :biggrin2
1999/2000 25' Crest II DL with Yamaha F115 4 Stroke

jadeboy
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Joined: Wed Mar 18, 2015 3:19 am

Re: Sylvan tritoon speed

#5 Post by jadeboy » Wed Feb 24, 2021 10:05 am

seems slow I can run that with my 22 Sylvan 2 log and a 115 Merc.

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steve1313
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Re: Sylvan tritoon speed

#6 Post by steve1313 » Thu Feb 25, 2021 12:53 pm

Yes, if you're only running WOT at 5200 RPM, you've got a mismatched prop. That Yamaha should be at about 6000 +- at WOT. As a comparison, I have a Yamaha 150 on a 23' tritoon and run at 6000 WOT and can touch 40 MPH GPS speed.
Steve
"Serendipity" - 2017 Sweetwater 2286 WB Tritoon w/ 150HP Yamaha
Slipped at Lake Anna, Virginia
2018 Tesla Model X

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