Do you run race gas or pump gas? I have a raptor with sparks exhaust and no air box lid but no internal motor mods and was wandering if race gas would give me more power or if it was just a waste of cash?
I was also told that with race gas you don't have to be spot on when it come to jetting on a 4 stroke is this true or not? I have read several mags about it and none really answer the question?

 

With your mods, race gas wouldn't help you at all. You would not gain any power. Infact running a higher octane than needed can actually hurt performance some. You only need to run race gas if you have a high compression motor that needs the higher octane to keep it from detonating. That's why you always see the race bikes running race gas because they usually have high compression motors. So until you go with a high compression piston in your bike, I wouldn't waste your money on the race gas.

 

Pump gas with a lower octane will make more power in a stock motor. Burns faster, higher octane burns slower but also burns cooler.
I start runing 91 octane in my mach when it gets over 90* outside. Just to help keep it cooler. I use my mach for playing around only, well maybe a few races.

later

 

Hmm. Where do you buy race gas at anyways?

 

If you want the only gas that will help performace on a stock motor you have to run VP Ultimate 2 - oxygenated fuel.

You can buy race gas a lot of places. Check VP for their dealer network. Some places you can buy Sunoco 100 at the pump.

 

Not true. VP also makes a few other oxygenated fuels that will give a stock motor more umph if jetted correctly. There are other fuel producer that make oxygenated fuel that will give some gain as well, but I am not familar with anything but VP.

 

I saw this and thought I would give my $0.02 for something that is bound to come up: aviation gas. I'm not endorsing it, I'm telling you not to believe the hype. Don't run it. A lot of people run it because it is 100 or 110 octane and is leaded. As stated earlier, higher octane fuels are more suited for higher compression ratios and burn too slow for stock engines. Lead does nothing to help performance. It is added strictly to help soften the impact of the valves on the valve seats. Modern engines have hardened valve seats, so lead is unnecessary. Plus, av gas is formulated to be run at high altitudes and constant, low RPMs. Do you plan on riding at 15000ft and at a constant 2000 RPM? No? Then av gas is a waste. Another thing to point out: octane is not a physical part of gasoline, it's a measure of cleanliness and resistance to detonation. A lot of people think that higher octane means higher horsepower. These are also the same people who rebuild the powerbands and put new cams in their Banshees. The bottom line is this, until you go crazy with higher compression ratios and wild cams, stick with 93 octane pump gas. It will be much better on your engine and wallet in the long run.

 

You're saying 93?
I'm only running 83 to 87 in my Raptor is that too low then?

 

I was simply stating that the only performance enhancement would be to run an oxygenated fuel, I guess it doesn't have to be VP Ultimate 2, but any oxygenated fuel. That was my point at least.


If your Raptor is stock compression, a measly like 9:1, you could probably get away with that without a problem. That is about the compression ratio of a push mower.

 

I ran 91 and 93 octane with just the Alba pipe kit. And I will run only 93, or 93 with a high octane boost that raises octane points 10-14pts with the 11:1 686.