Higher octane in a low compression engine does not give you more power, if anything it takes away power. Here is a good explanation on fuel from Dragon racing fuels that was posted on vitalmx.com.
"Fuel Facts from Dragon Racing Fuels
In our first segment of many I would like to help everyone learn more about performance fuels. We will go into more detail in the upcoming segments of fuel facts.
Possibly one of the most misunderstood parts of performance or racing in general is racing fuels. Most racers, parents, and mechanics have an opinion about what fuel works best for them but most are wrong or just do not understand what to look for in a racing fuel. Dragon Racing Fuels would like to take a few minutes to help explain just what racers need to know or what to look for in a performance fuel.
First things first, we must understand octane. What is octane? Octane actually has two definitions, one is that octane is a flammable hydrocarbon liquid that along with other hydrocarbons – pentane, hexane, heptanes, and many others – is refined from crude oil and make up the blend of chemical components called gasoline. That is a chemical definition of octane and the other is that octane is a measure of a fuels tendency knock or ping when mixed with air and burned in the cylinder of an engine. Plain and simple octane is used to measure a fuels ability to resist detonation.
The next thing we need to know is how is the octane rating determined? Gasoline is subject to testing methods to establish its octane rating. One called the motor method, which runs the gasoline in an engine under load and is listed as the MON. The other test is called the research octane and this is run without load and will show larger numbers. This method is listed as the RON. What you see at the pump when stop to get gas is a pump octane number, which is the RON+MON/2. It is the average of the motor octane and the research octane.
One of the biggest myths about octane is that the higher the octane the hotter and faster it burns. The second biggest myth being that the higher the octane the more horsepower it makes. Both of these crazy myths are far from true. Actually the higher the octane the slower and cooler the fuel will burn and octane does not equal horsepower. You should use the lowest octane fuel that your engine can safely perform on. Because once again octane does not equal horsepower! It only serves as a level of protection from detonation or better known as the Death Rattle.
Once we can get past the discussion of octane, we have several other things we can talk about, like burning speed, energy value, and cooling effect. The burn speed is the speed that a fuel will release its energy. So if the fuel is still trying to burn beyond the point of peak cylinder pressure performance will be sacrificed. The energy value is the potential energy the fuel can produce. The energy value of a fuel is measured in BTU and not in pounds and the cooling effect is related to heat vaporization. Which means the higher the fuels heat vaporization the better the fuel can cool the intake charge into the engine. This can have a big effect on horsepower in today’s engines.
One more thing in today’s world of race fuel is you can use an oxygenated fuel. An oxygenated fuel has chemical properties to contain and carry added oxygen in the intake charge of fuel. If tuned correctly, oxygenated fuels can and will produce more horsepower and torque over a nonoxygenated fuel.
Make sure you stay tuned to Vurbmoto.com for the next segment of fuel facts brought to you from Dragon Racing Fuels and find out how you can come close to picking the correct race fuel for your dirt scooter.
Mark Ticen – Dragon Racing Fuels, Fueling Your Passion!"