Octane question
You're gonna get every possible answer from 87 to super race fuel. 
What matters is what the manual says. If your manual says it's ok to run 87, you don't need to run anything higher or all you're doing is wasting money.
Also, your manual will probably give a RON number (more popular international standard) instead of the AKI rating (less popular US rating), so the number will often times look higher in the manual.
For instance, your manual will probably say the minimum RON is 91. This equates to 87 octane under the US AKI standard.
I run 87 in everything, but run what you like!
What matters is what the manual says. If your manual says it's ok to run 87, you don't need to run anything higher or all you're doing is wasting money.
Also, your manual will probably give a RON number (more popular international standard) instead of the AKI rating (less popular US rating), so the number will often times look higher in the manual.
For instance, your manual will probably say the minimum RON is 91. This equates to 87 octane under the US AKI standard.
I run 87 in everything, but run what you like!
Last edited by kilgoretrout; Apr 25, 2010 at 09:14 PM.
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From: USA
with the compression ratio of the cbr f4 u can run up to 104 octain and continue to make more power, anything past 104 is a waist of money, most cars anything over 87 is a waist of money, because of the compression ratio's. if the f4 manual says u can run 87, then by all means "yes" you can, and without hurting to motor, but you can gain a little juice by getting a higher grade, you wont notice much by running premium, but I like to to to my local vp racing station and fill up with 100 street blaze as its called, about 25-30 dollars to fill up, and I really notice a difference!!
also found this
Higher octane gasoline did reduce engine knock in older engines that used carburetors to regulate the air/gas mix. The older engines could not regulate the air/fuel mix going into the engine as efficiently as a computerized fuel injector. A carburetor in need of adjustment could cause too much fuel to be mixed with the air, which meant the gasoline would not burn completely. The excess gas soaked into carbon deposits and caused a premature ignition of the gasoline from the heat of the engine cylinder. The premature ignition made a sound that came to be known as 'engine knock.' When this happened, people would change to the higher octane/slower burning gasoline to resist the premature burn, thus minimizing the knock.
that was written for cars but i think it applys well
It all comes down to personal decision, hope I gave some usefull info
also found this
Higher octane gasoline did reduce engine knock in older engines that used carburetors to regulate the air/gas mix. The older engines could not regulate the air/fuel mix going into the engine as efficiently as a computerized fuel injector. A carburetor in need of adjustment could cause too much fuel to be mixed with the air, which meant the gasoline would not burn completely. The excess gas soaked into carbon deposits and caused a premature ignition of the gasoline from the heat of the engine cylinder. The premature ignition made a sound that came to be known as 'engine knock.' When this happened, people would change to the higher octane/slower burning gasoline to resist the premature burn, thus minimizing the knock.
that was written for cars but i think it applys well
It all comes down to personal decision, hope I gave some usefull info
Senior Member
Joined: Jun 2006
Posts: 445
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with the compression ratio of the cbr f4 u can run up to 104 octain and continue to make more power, anything past 104 is a waist of money, most cars anything over 87 is a waist of money, because of the compression ratio's. if the f4 manual says u can run 87, then by all means "yes" you can, and without hurting to motor, but you can gain a little juice by getting a higher grade, you wont notice much by running premium, but I like to to to my local vp racing station and fill up with 100 street blaze as its called, about 25-30 dollars to fill up, and I really notice a difference!!
It all comes down to personal decision, hope I gave some usefull info
It all comes down to personal decision, hope I gave some usefull info
On any stock motor, you will make your most power at the lowest octane you can run without detonation/knock. You are wasting your money on 100 octane fuel for your stock cbr.