Make: Honda
Model: CBR 600 F4i
Year: 2002
Fuel Injection

I ordered NGK spark plugs for my 2002 Honda CBR 600F4i motorcycle.
The manual states I should use NGK IMR9A-9H.
However my dealer gave me IMR9C-9H.
He said that the C superceeded the A.
Is he correct, and is is safe to fit the IMR9C-9H instead of the IMR9A-9H?

 

that c is for california

 

If they've got the same thread and same heat range which is a 9 than yes, shouldn't be a problem. They are the same and performance wouldn't be any different.