Ya used the wrong oil in the gear box, the clutch is slipping, to fix thhis it could be as easy as proper oil replacement in the gearbox or as bad as new clutches, the oil you use in a bike is VERY important as some cause clutches to slip and others to grab depending on the weight.
Did you use transmission fluid or motor oil in the gearbox?
changing fluids will have no effect on the clutch operation. what fluids did you change? did you make any other adjustments - such as clutch lever free play?
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