that what i was trying to say is cooler is better once engine heats up

 

I run 110 race fuel in my YFZ and alcohol in my DS 730

 

You need more octane as you raise your compression. Other then that, higher octane is a waste of money. It don't make you go any faster unless you raise your compression.

 

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.

Run the type of fuel your manufacturer recommends !!!!!

 

thanks Zbart1!