Who runs high octane. Is it leaded or unleaded

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#1
Hi i have a 97 cr250 and i know its much better to run high octane gas. In the manual it says to run unleaded but around where i live its very hard to get unleaded high octane gas. Im curious what octane you guys are running and if its leaded or unleaded. I know in a car it will ruin the o2 sensors and cat, but this does not have either.

Thanks :cool:
 
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#2
if your bike is totally stock premium is fine, is the bike modified in any way as far as cylinder porting or a decked head. what type of riding do you do? glad to help more info please.
 

RM_guy

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Damn Yankees
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#3
All pump gas is unleaded so I'm not sure how high of octane you are looking for. Like Hot-mod says, premium (92-93 octane) is fine for a stock bike although you may be able to run a lower rating if you are not getting any detonation.
 
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#4
I do mostly trail and hill climbing. Out here is CA premium is 91 and nothing higher. As far as detonation i dont think its a huge problem. I was thinking of mixing a gallon of high octane with premium to bring it up to 93-94 octane but can the bike handle unleaded gas. One gallon of 104 leaded with four gallons of 91 premium. I know the manual says 92 octane minimum. Right now i have standard add ons but no engine work.
 

tony91

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#5
If your looking for improved performance from your fuel, there's a lot more to it than octane. Do a search on race gas and start reading. Here's a thread to get you started.

In the mean time, get your hands on some VP C-12 , get your jetting dialed, and you'll be hooked... promise.
 
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#6
I run leaded race gas in my bike...like Tony said I'm hooked. Great throttle response and no pinging.
 
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#7
If you're in the bay area, Infineon Raceway has some pretty high octane fuels at the pump out there. Many motorcycle shops in the area sell 5 gallon cans of all sorts of leaded, unleaded, and oxygenated race fuels.
 
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#9
Most of us run unleaded fuels. Running leaded fuel in your bike wont hurt anything. Any change in fuel may require a change in jetting.