I have a Honda CBF125 Stunner. Sometimes when I increases the throttle the bike cannot attain the real speed that matches the RPM and the engine sound changes.
The bike takes more time to attain about 90kmph than earlier.
What may be the problem?
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Your clutch might be bad
If your clutch is slipping then the RPM's of the bike can go up but the bike doesn't accelerate as the clutch slips.
Many times a clutch will start slipping when the engine is at a higher power output. If you are operating under higher RPM's in higher gears, this is when the greatest load is on the clutch, chances are you are experiencing this.
You can try and adjust your clutch cable and make sure there is enough play in it. There is a writeup in this answer about clutches regarding howto adjust one. Give that a try first, although you may have already caused damage to your it's best to ensure yours is adjusted properly, regardless.