Kaisar KS125-23 Urgent help needed.

I got this 2nd hand 3 weeks ago and has been fine until now.

Now for no reason it seems to max out before it hits 50mph. When it does the power drops but the revs shoot up like i have the clutch in i have to let of the revs a bit to regain power..

Is there anything i can do or try from home. i have to get to work on this tomorrow.

(just done oil change, no effect)

Your clutch is slipping - check clutch cable adjustment or replace clutch plates or complete clutch badket

Clutch sorted and thats sorted the over revving still cant get past 50mph tho.

50 is about its limit I would say
My 150cc does 60 or near