VOLATILITY OF GASOLINE:
For easy starting with a cold engine, gasoline must be highly volatile so that it will vaporize readily at a low temperature. Therefore, a percentage of the gasoline must have highly volatile hydrocarbons. (This percentage must be higher in the cold regions than in warm climates.)
In other words... if you have any left over gasoline from summer or fall, change it. Especially if you live in a cold state like Michigan. This may help with your cold starting problems. So far, we have not had any problems with our 400ex and 300ex. We drained the old gas out and put new gas in, starts with little warm up time. Good Luck.

Not so blue anymore!

 

Buy your gasoline from the busiest gas station in town whenever possible. That is the creedo that I live by.

 

Me too... Especially in winter.

 

Adding some gas-line antifreeze once in a while is also a good idea.
If your bike (or gas cans) go in and out from warm storage, keep them as full as possible. The more air there is in the tank, the more moisture will condense out of it when the temperature changes.

 

So... I shouldn't run 93 octane in my machine in the winter? Right?

 

good advice, keep them full and I also turn it to reserve when rideing to keep the nastys from building up at the bottom. Also, Briggs and stratton makes a neat $5 gasohol tester that can detect any alcohol in the fuel so you can steer clear of bad fuel. Part number 100023

 

That gasline antifreeze will eat your inner carb gaskets and is not recommended for use in two or four stroke motors.

 

Octane has nothing to do with cold starting.
Hubby is looking the information up, hold on....
Still looking.... hold on.......................
The rating is made in terms of octane number or octane rating. A high-octane fuel is highly resistant to detonation. A low-octane fuel detonates rather easily. This has nothing to do with volatility (ease with which a liquid vaporizes).