Dirty carb, valve adjustment, bad spark plug, failing coil, failing CDI, bad air filter, cracked carb intake boot. The list goes on and on.
I would check the valve adjustment. This gets severely neglected and causes the exact issue you describe. I don't know the specs or procedure for your specific bike. If that checks out, I would move onto cleaning the carb and changing the air filter. If that's OK, I would move onto checking the ignition system.
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