Hi, I bought a 2002 CBR600F4i a few months ago and the person who sold it to me did not have the owner's manual. I forgot to ask him about the octane rating for the bike and started filling it with 89 octane gas. I just read a few forums that said that the bike doesn't need anything more than an 86 octane rating. Does putting in a higher octane rating fuel hurt the engine in anyway? Does it benefit in any way or is it just a waste of money? And is there any harm in switching to lower octane gas now? Should I drain the tank before switching?

Thanks in advance,

 

Check out the topic named "What gas do you guys use." This will have all the info you need

 

ya i resurrected an old post about that haha

well you don't need more than 87 if it doesnt ping or act weird
and it's better for the bike as you don't want it to run too rich

After 2 fillups I usually add Chevron Techron Pro-Gard FI cleaner and put a little bit in it.

 

I believe my Owners' Manual calls for 86 or 87 octane. I use 89 octane.