I ran 91 my last ride and noticed my quad ran better.....If I remember right the airbox lid states 89 or 91 as the proper octane

 

I can't tell the difference between 89 and 91 or 93 in mine, so I just use 89.

 

The manual for my 2006 sportsman 500 EFI says minimum octane of 87, it doesn't say it can't be exceeded. But if these engines are suseptable to the same problems as car engines, running high test will carbon up the engine faster. No real problem just run combustion chamber cleaner through it more often.

 

can someone tell me that premium gas burns faster than regular??? what burns faster and why i never understood it!

 

IT BURNS SLOWER



Here is an old post of mine...........

Iwrote this for a snowmobile forum and have posted here:



Well I will try to give you a short version of this :
premium gas was and is designed to protect your engine against detonation. and it does this because of the chemical makeup of long branch tightly bonded molecules. Where regular gas has a molecular structure that has less of a bond.
The chemical composition of the fuel determines how fast the fuel will burn and if it will work well with high compression or temperatures.
fuels with weak molecular structures [regular] will break down more quickly or burn spontaneously [detonation] at lower temperatures.
Fuels with tight molecular structures [ premium] burn more slowly and take more pressure and heat to fully break down and burn.
therefore putting premium fuel in a engine not designed for high octane fuel [I e not having high compression or spark advance ] will not be able to break down the chemical bonds. And will not completely burn the fuel charge therefore produce less power.
So you see next time your at the pump buying that 115 octane racing fuel for your sled that costs five dollars a gallon. you may want to reconsider. And by the way no fuel can be over 100 octane ! It's a percentage
Run the type of fuel your manufacturer recommends !!!!!

 

If your machine is stock run what the owners manual calls for or you could be reducing performance.

If its modded and higher compression use Premium.
Also if its old and worn higher octain may help.

I run regualar in my sp700 and premium /super in my trail modded and ported scr400 (recommended by HPD).

Jim

Fuel For Thought
By Rich Rohrich
Part 1 - The Basics


http://www.eric-gorr.com/tech/tech_main.html

 

Polaris owners manul says 87 octane for fuel.

"IF" you live in state that requires oxygenated fuel (minnesota 10% ethano ) then you run 89 octane.

Anything higher than 87 is a waste of money unless you have increased the compression of the motor.