2) One has to isolate and specify the problem before a solution can be concluded upon.
3) The slide issue is a well known and documented one, and hence getting stuck at say 80Kph and not going above is an indicator of that.
Your problem is different and could be worn clutch plates among other reasons. Please go through this thread, read as much as you can and try and identify what is happening with your bike.



and office is within city limits. 






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