©2005 olilolo productions all rights reserved. or some crap, anyway

This is a gear ratio chart. It will help you realise the mechanically possible top speed of your CBR. One thing to remember is that the CBR250 R and CBR 250 RR have different revlimits. R = 17500 RPM and RR = 19000 RPM. There are ways of freeing the revlimiter but peak power is achieved by 17000 RPM so it really serves no purpose.
This is THE service manual in PDF format. DON'T print it out unless you have a ream of paper spare. Very handy if you are a DIY mechanic, but also a bonus if you have no idea how your bike works as it describes in detail where everything is and how it all goes together.