Which is the best gas for a carbureted see you do 100% regular or super unleaded?

[Taylor4616]

OK so my question is I have a Sea-Doo 95XP twin carbs 717 or 720 I’m not sure which and my question is should I run 100% regular gas with no ethanol in it or 91 octane super unleaded? Someone told me if you run regular hundred percent that it won’t clog up carburetors is easy anyone else have any experience on that?

 

[mandriva]

These machines is build for run 87octanes, but personally i always run 93 octane for precaution against detonation

 

[matempl]

I run 87 octane in my 95xp and in my 96gti. Both are 717 twin carb motors and I have no problems. I think what is key is don’t let the gas sit. I never let my skis sit more than a few weeks without running them. Modern gas has very short shelf life.

 

[racerxxx]

I run 87, sometimes 89 ethanol. I can't get anything but ethanol fuels. I run sta-bil in the gas every tank. I have zero issues, no separation, no bad gas smell, nothing. I'll let a full tank of gas sit in the tank from October until May/June and go out as ride it like I stole it. Y'all worry too much or listen to someone who knows someone, who's brothers, cousins, uncles, sister's boyfriend blew his ski up cause the gas had ethanol in it. When in reality his fuel system was 20 years old and never did an ounce of maintenance to keep his ski healthy. But they found crap in the carbs and it had to come from the corn husks in the ethanol. LOL.

 

[benjilafouine]

As a rule, I only use premium 91 in all my gasoline gizmos (15 of them, including trimmers, ATV, generators, Sea-Doos, cars, snowblower, wood splitter, etc.). In theory, 91 here in Canada doesn't contain Ethanol. If I could buy 94 around here I would. Not sure if this still holds but 15 years back I would get a good 10-15% more mileage out of the 94 octane with my car.

 

[mikidymac]

The manual says 87 so I run 87 in all mine and here in California it’s all up to 15% ethanol. I think only the DI skis require 91.

 

[benjilafouine]

@mikidymac You don't think higher octane brings any benefit at all?

 

[Taylor4616]

As a rule, I only use premium 91 in all my gasoline gizmos (15 of them, including trimmers, ATV, generators, Sea-Doos, cars, snowblower, wood splitter, etc.). In theory, 91 here in Canada doesn't contain Ethanol. If I could buy 94 around here I would. Not sure if this still holds but 15 years back I would get a good 10-15% more mileage out of the 94 octane with my car.

Ok sounds great everyone...im thinking because my 2000 rxdihas to run 91 i will also in my 95,and 94 xp ,and xps...i guess all the main trouble with gas is in the gray line

@mikidymac You don't think higher octane brings any benefit at all?

well im thinking if like a race car,the more the better right?

 

[Dr Honda]

As a rule, I only use premium 91 in all my gasoline gizmos (15 of them, including trimmers, ATV, generators, Sea-Doos, cars, snowblower, wood splitter, etc.). In theory, 91 here in Canada doesn't contain Ethanol. If I could buy 94 around here I would. Not sure if this still holds but 15 years back I would get a good 10-15% more mileage out of the 94 octane with my car.

To burn anything other than 89 in our skis is a waste of money. AND... in a 2-stroke... it's actually bad for the engine. The fuel burns slower, and in turn, concentrates heat on the piston crown and exhaust port.

In most modern, computer controlled cars/trucks... they can readjust to take advantage of the higher octane.

 

[Austrian Rotax]

Ethanol isn’t an issue so long as you use a good fuel stabilizer. I use 91 here in Canada from shell to avoid the ethanol as it does slightly decrease performance due to it having lower energy then pure gas (unless accounted for with new jetting)

 

[JJinSC]

To burn anything other than 89 in our skis is a waste of money. AND... in a 2-stroke... it's actually bad for the engine. The fuel burns slower, and in turn, concentrates heat on the piston crown and exhaust port.

In most modern, computer controlled cars/trucks... they can readjust to take advantage of the higher octane.

What he said. I agree.

 

[benjilafouine]

But in Canada at 91, we are not supposed to have Ethanol in it... Damn if you do, damn if you don't...

And my 2-stroke is still very strong at close to 200 hours (so far)...