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#12461205 - 10/10/17 06:47 PM What octane to run four stroke Yamaha
chas1 Offline

Registered: 04/01/06
Posts: 456
Loc: Stephenville tx.
I just purchased a 2012 four stroke 70 hp Yamaha, any suggestions on what gasoline or octane rating to run in this .Also what’s the best fuel additive, thanks for your help

#12461347 - 10/10/17 08:20 PM Re: What octane to run four stroke Yamaha [Re: chas1]
gary purdy Offline
TFF Guru

Registered: 05/24/03
Posts: 11258
Loc: Littlefield Tx & Lake A. H. US...
When in doubt always use mid-grade. Additives are like Ford or Chevy. You can use Yamaha ring-free or 28 others. I prefer Sea Foam because it does everything that the others do + it is a real good fuel preservative. Keeping fuel good for 3 years.
The world will not be destroyed by those who do evil, but by those who watch them without doing anything. Remember what He has done and remember that He is not done yet!-- GOD IS GOOD

#12461354 - 10/10/17 08:26 PM Re: What octane to run four stroke Yamaha [Re: chas1]
SteezMacQueen Online   sleepy
TFF Team Angler

Registered: 11/02/14
Posts: 4584
Loc: Red Oak, Galveston, and Pagosa...
87 octane( maximum 10%ethanol) and 1 ounce of Yamaha Ring Free per 10 gallons as insurance. Though the ring free isn't required per the owners manual. If you don't use the boat often, then sea foam or stabil 360 marine is a wise choice to stabilize the fuel a little.
RIP little Nitro

#12463315 - 10/12/17 02:27 PM Re: What octane to run four stroke Yamaha [Re: chas1]
chas1 Offline

Registered: 04/01/06
Posts: 456
Loc: Stephenville tx.
Thank you for the advice

#12464697 - 10/13/17 05:45 PM Re: What octane to run four stroke Yamaha [Re: chas1]
dk2429 Offline

Registered: 03/28/16
Posts: 269
Loc: Pearland, TX
Just run 87 in it.. Sea Foam in everything I own. Stuff works miracles
Majek 22 Extreme/225 Optimax Pro XS
2006 Chevy 2500HD Silverado/6.6 Duramax LBZ

#12475079 - 10/22/17 05:36 PM Re: What octane to run four stroke Yamaha [Re: chas1]
psycho0819 Offline
Extreme Angler

Registered: 03/27/05
Posts: 1508
Loc: Kaufman
I run super in my F70 with seafoam addidtive. Mine's a 2013 and has been getting fed the same combo all its life. Runs like a top.

I could be wrong, but I think my owners manual calls for minimum 89 octane.
If you're not living on the edge, you're taking up too much space!

#12476666 - 10/24/17 01:07 AM Re: What octane to run four stroke Yamaha [Re: chas1]
Curtbass Offline
Extreme Angler

Registered: 04/17/15
Posts: 1194
Loc: Grand Prairie, Tx
My 13' SHO calls for 89 octane. I ALSO run ethanol free 87 octane in my older Mercury motors. Haven't had ANY fuel related issues in motors/fuel lines/bulbs etc for over 2 years.NO PHASE SEPERATION/MOISTURE collecting problems!!(knock on wood)!!! It costs a little more per gallon, but, its WORTH .25-.40 cents a gallon more, to NOT have ethanol issues. I run 89 octane non ethanol & Yamaha Ring free & Stabil 360 in my SHO 250 Yamaha & use 87 octane ethanol free with Mercury ring/carbon additive & Stabil 360 in my Mercs. I ALSO install & maintain fuel/water separator filters on ALL my boats.
Lookup app on line. All U.S individual states & Canadian Locations. Find Tx at top of listed states & click. It gives all locations in each state that sells ethanol free gas, which octane ratings, address of locations & phone# of those locations.
I do know WalMart Murphy station in Weatherford sells 87 ethanol free fuel for the closest one to Stephenville or I think there may be a location in Dublin Tx west of Stephenville. Good luck & avoid ethanol problems period, by doing this.
PS: I have also started running it in my Chevy pickup that I tow with. Better fuel mileage empty & towing.

Edited by Curtbass (10/24/17 01:24 AM)
'98 Tr20 Triton
'94 Merc 200Xri
HydroDynamics 10" JP
Tempest Plus 25P-B&B @Steves Custom Props-Josh Edwards

92' ChampioN 201DCR Elite
13' Yamaha250SHO
HB Helix12 G2N
HB Helix10 G2N


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