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Gas <what octane level?>

match308

Active Member
Messages
16
Ratings
9 1
Points
38
Location
DFW
Boat Make
Yamaha
Year
2018
Boat Model
Limited S
Boat Length
24
#1
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 Lover
Messages
156
Ratings
82 2
Points
78
Location
NJ
Boat Make
Yamaha
Year
2016
Boat Model
242 Limited S E-Series
Boat Length
24
#2
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

Jet Boat Junkie
Messages
721
Ratings
670 30
Points
128
Location
Lake Livingston, Texas
Boat Make
Yamaha
Year
2016
Boat Model
242 Limited S E-Series
Boat Length
24
#3
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

Jetboaters Admiral
Messages
4,771
Ratings
4,602 105
Points
313
Location
Alabaster, AL
Boat Make
Moomba
Year
2019
Boat Model
Other
Boat Length
23
#4
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
 

swatski

Jetboaters Fleet Admiral
Messages
8,789
Ratings
9,441 138
Points
493
Location
Saint Louis, MO
Boat Make
Yamaha
Year
2016
Boat Model
AR
Boat Length
24
#7
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/prem...ane-for-your-tow-vehicle-toyota-trucks.19891/

--
 

Hilario Perez

Well-Known Member
Messages
220
Ratings
93 1
Points
48
Location
Kissimmee FL.
Boat Make
Yamaha
Year
2011
Boat Model
SX
Boat Length
24
#8
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

Jetboaters Fleet Admiral
Messages
8,789
Ratings
9,441 138
Points
493
Location
Saint Louis, MO
Boat Make
Yamaha
Year
2016
Boat Model
AR
Boat Length
24
#9
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.

 
Messages
20
Ratings
3 2
Points
13
Location
Carrollton Texas
Boat Make
Yamaha
Year
2018
Boat Model
AR
Boat Length
24
#10
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

Jetboaters Fleet Admiral
Messages
8,789
Ratings
9,441 138
Points
493
Location
Saint Louis, MO
Boat Make
Yamaha
Year
2016
Boat Model
AR
Boat Length
24
#11
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!

--
 

captras

Jet Boat Junkie
Messages
721
Ratings
670 30
Points
128
Location
Lake Livingston, Texas
Boat Make
Yamaha
Year
2016
Boat Model
242 Limited S E-Series
Boat Length
24
#13
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.
 

merlinjet

Well-Known Member
Messages
170
Ratings
85
Points
58
Location
Laughlin, NV
Boat Make
Yamaha
Year
2014
Boat Model
SX
Boat Length
19
#14
x2 on the Stabil 360!
 
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