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Gas <what octane level?>

match308

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Yamaha
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2018
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Limited S
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24
Is regular gas the best option for the Yamaha? I’ve always been told that Premium was necessary for all boat engines.
 

seadude

Jet Boat Addict
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NJ
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Yamaha
Year
2016
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242 Limited S E-Series
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24
Pretty sure Yamaha recommends 89 pump octane for the 1.8l engines - that's all I can get a the Jersey shore and they run fine.
 

captras

Jetboaters Lieutenant
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Yamaha
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2016
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242 Limited S E-Series
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Manual says minimum Recommended fuel. ..86 Oct. Page 114 2016 242 limited SE. I use 87 with no issues! Premium is a total waste of money! If you don't mind the extra cost you are better to use 87 no ethanol fuel!
 

haknslash

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Moomba
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2019
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Other
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You run 86 in it. Lowest we have here is 87 and that would be fine too. I run the cheaper regular ethanol at your local gas station but I also use Stabil.

Here's the AR240 owner's manual...

image.png
 

match308

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Thanks. Great to know
 

swatski

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True for the Yamaha JB engines, certainly the N/As that do not even have knock sensors - like in my boat.
But - if you drive a Toyota, then I don't know about that...
93 certainly makes a difference. I figured it costs me about two Starbuck drinks - which I don't do anyway, lol - to fill up my truck with 93 vs 87, so I do it all the time!
https://jetboaters.net/threads/premium-vs-regular-93-or-87-octane-for-your-tow-vehicle-toyota-trucks.19891/

--
 

Hilario Perez

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I use 87 and at least 2 times in the season here in Florida I put in seafoam and the boat run awesome. Two weeks ago me and 3 other buddy's of mine ran from Malabar to Fort Pierce and I had 4 adults
And my SX 240 was running 51 to 52 mph.
 

swatski

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I use 87 and at least 2 times in the season here in Florida I put in seafoam and the boat run awesome. Two weeks ago me and 3 other buddy's of mine ran from Malabar to Fort Pierce and I had 4 adults
And my SX 240 was running 51 to 52 mph.
If anything, Yamaha 1.8 N/As run a tad faster on 87. That’s been my experience and others.

That said, if given a choice I would always buy non-ethanol for a boat. We don’t have that choice though around here.

 

iamcalled

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Along this line what do y’all do to store your boats for winter as far as fuel left in the tank. Was going to use stabil which says to fill tank to 95% full then add 1oz for every 2.5 gallons but i figure these tanks are aluminum or poly and won’t condensate. Thoughts?
 

swatski

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Along this line what do y’all do to store your boats for winter as far as fuel left in the tank. Was going to use stabil which says to fill tank to 95% full then add 1oz for every 2.5 gallons but i figure these tanks are aluminum or poly and won’t condensate. Thoughts?
Absolutely, positively, use Stabil for long term storage with any E10!

--
 

2kwik4u

Jetboaters Commander
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Absolutely, positively, use Stabil for long term storage with any E10!

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I'm over cautious. I fill with E-0 "rec fuel" from the rural station, then add Stabil on top of that for storage.
 

captras

Jetboaters Lieutenant
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Lake Livingston, Texas
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Along this line what do y’all do to store your boats for winter as far as fuel left in the tank. Was going to use stabil which says to fill tank to 95% full then add 1oz for every 2.5 gallons but i figure these tanks are aluminum or poly and won’t condensate. Thoughts?
Use Stabil 360 rather than regular stabil. It is a little more expensive, but designed for marine purposes. Plus it is 1oz per 10 gallons.
 

Papa

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X2 on Stabil 360. Keeps my lawn equipment running also.
 
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