I always put premium gas in my CBR, even though it does not require premium gas.
Does it do any good to the bike?
or it is waste of money?

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I'll be the first SEARCH [sm=welcomesign.gif]

 

premium gas is always ALWAYS best. better than crappy gas. but what i'm sure you ment to say is 91-93 PON, and not premium.

and yes, it's a waste.

 

Much discussion recently on this topic. Search and you'll find it. But i run 89. Generally if an engine only calls for 87, putting 93 in it is a waste of money...plus it makes your exaust smell as you do not get as completet a combustion as with 87. I ran 93 in it the first few tanks, but after switching to 89 didn't notice any difference in performance or response. So I split the difference and run 89.

 

I notice my bike runs more choppy if I use 89 so I use 93. But I have a california type F4 so its forced to run lean naturally and the 93 helps.