A clutch cable doesn't expand nor a clutch cable is supposed to expand. What we need to make sure is to have the right free play on the clutch lever. Too high a clutch engagement point or too low can cause shifting issues, where in, the gears grind or have trouble slotting, especially the clutch free play is too low. Too low an engine oil level too can cause trouble. The CBR is supposed to take in 1.5 liters of engine oil along with oil filter replacement. Too little oil will make sure your shifts will be notchy. Start off with adjusting your free play at the clutch lever right, it should solve your shifting issues.
Thirdly, the CBR is a high revving engine where power and torque are way up the RPM range, unlike commuter bikes which have torque low down. It gets some time to getting used to the RPM range in which one can extract performance, but it's not hard either, you'll get accustomed to it easily. The CBR is always happy if the revs are above 4.5k for the most part, also traffic can be sore point owing to frequent down and upshifts which again some don't like. Shifting too fast below 4k RPM would lug the engine and that's not good. Rev match, so that the shifts are easy, rev match also helps gears slot in easily, make it a practice and you'll enjoy your bike even more.
The key takeaway is this, make sure your RPMs are above 4.9k for best performance, and smoothness in gear shifts. Rev match as you'd normally down when downshifting, it helps shifting an ease.
Cheers!
VJ



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