Sounds to me like water in the carb.
I suffered from similar symptoms just recently and it was because my fuel got polluted with some water from the local Shell station - quite common around this time of year.
Clean your carb, drain some fuel out of the tank when it's switched to reserve and give it a shot of meths into the tank for lapping up any left over water. If still not running right, take bike into shop for a clean/adjust.
90% of the time spent writing this post was spent thinking of something witty to say. It may have been wasted.
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