ok i usually run premium in my banshee with a 32:1 premix. never had a problem. i just bought my first 5 gals of race gas. i mixed the race and premium to a 50:50 ratio. 2.5gal race and 2.5 prem. my questions is what coctane is race gas.

i thought there were different octanes. i figured that the gas was 110 octane. well i was told it was 120 oct. so now im not sure. what is the most common octane in race gas? what other octanes are there for racing?

also if i run this 50:50 race:prem. mix is my bike in any danger of motor problems? i know high octane makes it run hotter but am i risking my motor?

for those who might know the gas station its the one in El Cajon across the street from AM/PM off mollison. so if any of you know what octane they run in that gas would help me out alot.

rich

I doubt it is 120 octane. Is it VP? VP red is 106 octane and C-12 is 108 octane.

see i dont know which one it is but i highly figured it was that high. cuz i know they all usually run around 107 to 111 octane. i figured 120 was way too high.

i pumped it from a gas station so i dont know what brand they have.

rich

I like running a 50/50 of C-12/108 to 91 pump.

Ck out http://www.vpracingfuels.com They should have better info for you...

ALOT of people dont know this, but higher octane means less horsepower, it does absolutely nothing to make your ride faster, it is strickly a burning issue, where and how it burns in the cylinder, burns cooler, more efficient and not as fast. I thought it was the other way around, until I did my homework.

Great info....i didn't know that, Does anyone know of a web site where i could do some reading on this. In Canada it gets pretty cold up here and i plan on riding in the winter, ice racing. YFZ450 here says 91octane minimum....wonder if it would be better to run a lower octane in the winter??

Bronc-o-boy11 i have a wr426 almost the same motor... with 91 pump climbing some of the big hills out in glamis i was getting some knocking... so i switched to 50:50 91 and f&l sp1 wich is 111 took care of all the knocks and has a little better throttle response now...

you also have to remember that you are not running higher compression and wild cams....race gas is not needed. Adding race gas to a stock or fairly engine will do no good at all, just cost you alot more money

I see your point, with modified engines, ignition systems yes lower octane will lower your horsepower, but in general, most people think I have a stock ..... and if I put race gas in it, it will turn into a rocket, I will be cool then, wrong. that was the point I was trying to make. hope nobody took it the wrong way and they are all putting 87 in their supercharged, turbo, high compression nos having death buggies.

it maybe make a little more power...cause it burns cooler...but it is hardly noticeable/worth the money if your engine does not require that high of an octane

I really dont know where we are going with this, I think we all pretty much agree that unless your motor needs high octane gas, its not worth the money or time to get it, I will be the first to admit that I am not Joe Mechanic, and dont know a whole lot about motors, but I have owned several motors, which required high octane, both 2 and 4 stroke, jet skis, and VW, really high compression motors, when I put lower octane in them they ran like crap, so it does make a difference, but for the majority of people I have come across they are under the assumption of the higher the octane the higher the horsepower, and that is simply not true, I am sure we have all come across someone at some point who is putting "race gas" in their stock quad for the big weekend cuz they want to beat their friend up the hill. maybe in their minds it helps, but not in reality. Modified motors I 100% agree that it makes a difference, but for the average Joe, paying an extra $4 plus a gallon, not worth it.

I put C-12 in my tacoma once when I had no other choice. I also ran c-12 in my buggy but since I got rid of it I haven't tried any race gas in my bikes. I was tempted to use it on my kx500 but wasn't sure if it would make a difference. I'll just need about 10 gallons of it mixed 50/50 with 91. I'll have to try it next trip.

rubths, you soon to be country effer! Trying to take advantage of a young ISBB with your proposal.

Octane requirements can be different between bikes and quads, and models. When my 400ex engine was stock it would run on 91 without knock no matter how hard I pushed it and might have even been designed to run on 87 (but I could be wrong). Now in my new ’03 cr250 manual it says to run 95 minimum and when I run straight 91 it will knock at high rpm under load. But it’s designed to be a closed track race bike where as banshees aren’t. All that being said I don’t know what Yamaha says to use in the Banshee. Anybody know?

Let's throw Ult. 4 and 2 into the mix. They are slightly higher in octane but significantly higher in Oxygen content. They make 6% more hp than pump gas on a stock motor. The ult. 4 is 92.2 oct. and ult 2 is 100.9 oct. Here's some gas that'll give you that slight edge on a stock machine. The price is super steep for this stuff.

you ever see how much Ultimate 4 costs? It is ridiculous. My buddy runs that in his Laegers CRF quad....I don't know how he affords it

well i just got back last night and it didnt make any real difference on power. well i didnt feel any difference. the bike seemed to run alittle hotter than normal but it wasnt a dangerous level of warm. and this was at a 50:50 mix race to premium.

i dont plan to run it all the time i just wanted to try it for this weekend to see how it does. if it was gonna be a huge difference then i would have planned to run it all the time but since it wasnt a noticable difference beside in my pocket book then ill stick with pure premium.

rich

On 4 strokes, if ya ping, use it, if not, don't.

my opinion only.

fyi I run 91 pump in my 440exs, and 50/50 91 pump and VP110 in my Yamaha 450s (which is the same mix I use in my turbo charged rail)

CRF 450 (stock or not) + Ultimate IV =
will give you as much oomph on a stock bike as bolting on a pipe.
It is worth the $9 per gallon on dune weekends.
Try it and see for yourself.

Race gas can anyone afford it now..