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Old 11-29-2008, 04:14 PM
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Default Yamaha F250B and 87 Octane fuel

Will this cause damage to the engines?
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Old 11-29-2008, 04:22 PM
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Default Re: Yamaha F250B and 87 Octane fuel

Will it cause damage - Maybe, maybe not.

Can it cause damage - Yes, absolutely.

89 minimum octane is required. Why would anything less even be considered?
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Old 11-29-2008, 07:48 PM
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Default Re: Yamaha F250B and 87 Octane fuel

How is the new boat?
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Old 11-30-2008, 05:07 AM
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Default Re: Yamaha F250B and 87 Octane fuel

Quote:
jethro1 - 11/29/2008 3:22 PM

Will it cause damage - Maybe, maybe not.

Can it cause damage - Yes, absolutely.

89 minimum octane is required. Why would anything less even be considered?
My nieghborhood marina only sells 87. The boat stays on a lift and trailering to go get fuel is a pita. Dealer stated that it would not damage the engines, just loose a little performance. The one time I have refueled has been at another marina on the way out. And their choices are 87 or 93. Looks like these 250's will get 93....

And the new boat is awesome
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Old 11-30-2008, 06:17 AM
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Default Re: Yamaha F250B and 87 Octane fuel

Quote:
minime - 11/30/2008 7:07 AM

Quote:
jethro1 - 11/29/2008 3:22 PM

Will it cause damage - Maybe, maybe not.

Can it cause damage - Yes, absolutely.

89 minimum octane is required. Why would anything less even be considered?
My nieghborhood marina only sells 87. The boat stays on a lift and trailering to go get fuel is a pita. Dealer stated that it would not damage the engines, just loose a little performance. The one time I have refueled has been at another marina on the way out. And their choices are 87 or 93. Looks like these 250's will get 93....

And the new boat is awesome
If they have 87 and 93 , I'd take a 1/2 tank of each - that's 89.......and don't listen to the web for this - call Yamaha and ask....many people use Yamahas in the bahamas where there is nothing but 87 and they seem to do fine. I suspect you'll be fine at 87 but call them. Make note of who and what date you communicated with them. An email from them would be ideal for your records.
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Old 11-30-2008, 07:34 AM
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Default Re: Yamaha F250B and 87 Octane fuel

Quote:
Glen E - 11/30/2008 5:17 AM

Quote:
minime - 11/30/2008 7:07 AM

Quote:
jethro1 - 11/29/2008 3:22 PM

Will it cause damage - Maybe, maybe not.

Can it cause damage - Yes, absolutely.

89 minimum octane is required. Why would anything less even be considered?
My nieghborhood marina only sells 87. The boat stays on a lift and trailering to go get fuel is a pita. Dealer stated that it would not damage the engines, just loose a little performance. The one time I have refueled has been at another marina on the way out. And their choices are 87 or 93. Looks like these 250's will get 93....

And the new boat is awesome
If they have 87 and 93 , I'd take a 1/2 tank of each - that's 89.......and don't listen to the web for this - call Yamaha and ask....many people use Yamahas in the bahamas where there is nothing but 87 and they seem to do fine. I suspect you'll be fine at 87 but call them. Make note of who and what date you communicated with them. An email from them would be ideal for your records.
Damn, I hate to agree with Glen but "here I go again".

Just mix the two grades of fuel as he suggested and you should be fine. I also suspect that if you use grade 87 that you will be fine but what if my/our suspicions are wrong? You will be the one paying the price, not us.

I have seen engines that have run fine using a substandard gasoline. But then I have seen engines that were run on the specified grade of gasoline with holes in the tops of the pistons when the gasoline was old and maybe had lost a point or two or its octane rating. Couple that with a prop that is too large, a hot day, an operator that jams the throttle wide open and you might have a receipe for disaster.

My doctor mandates that I take Prozac four times a day to calm my homicidal tendencies. Do you think it is OK to reduce my meds to just one a day based on advice from a website?

After all else fails, follow the manufacturer's instructions. Good luck with the new ride.
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Old 11-30-2008, 07:43 AM
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Default RE: Yamaha F250B and 87 Octane fuel

You can do as Glen suggests to be safe and mix your own mid-grade..

I had the same issue with my local marine fuel dock only selling 87 octane. My very experienced Yamaha mechanic told me that it would not harm the motors because the knock sensor would simply adjust the timing to prevent premature detonation (knock) which is normally the reason why high octane fuel is required. This can have a minor effect on performance, but frankly I never noticed it. After two years, my fuel dock switched to just selling 93 octane and I never noticed any difference from that either. I keep careful records of fuel burn and take lots of long runs and at least in terms of fuel economy, the regular and premium fuel were about the same. I sold that boat with 500 hours on the F250s and the new owner has 800 hours now and they still run perfectly and have had no problems whatsoever, so it doesn't look like running on 87 did anything bad to them.


The electronics on those motors have made possible many features designed to protect them against damage in operation.
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Old 11-30-2008, 10:45 AM
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Default RE: Yamaha F250B and 87 Octane fuel

Thanks guys, I am not planning on using 87 because I run out of Barataria Pass and can refuel at Grand Isle. But, if I'm low on fuel I would like to be able to put a little 87 to get me there and not have to pick up the boat and trailer to the gas station.

Glen, didn't I read one of your post about having fuel delivered? That would be nice and will check to see if anyone does that around here. BTW, I did end up getting the 4 JL 7.7 coax's with the MHD 600/4 amp. Should be here in 2 weeks!!
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Old 11-30-2008, 10:50 AM
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Default RE: Yamaha F250B and 87 Octane fuel

Quote:
minime - 11/30/2008 12:45 PM

Glen, didn't I read one of your post about having fuel delivered? That would be nice and will check to see if anyone does that around here. BTW, I did end up getting the 4 JL 7.7 coax's with the MHD 600/4 amp. Should be here in 2 weeks!!
Yup, Fuel Tech delivers to me in tanker truck for around street station price - 87 or 93. I run 87. Right now it's gotta be about $2 from them. Great people - nice to come home and have the tank filled and a receipt in your door after emailing. I don't think I've ever spoken to them. My CC card on file..great people.
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