Run the motorbikes engine to a normal running temperatue and thn set the air-fuel mixture by ...tightening all the way in taking care not to over tighten it as you may damage the tip of the screw,usually its thn 2 and half turns outwards or 3 , you will notice the change inthe idling of the bike's engine.
Its better to check the spark plug gap and also check the air filter, blow it with compressed air or if its tht dirty best would be to replace it.
Good luck.
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air fuel mixture screw settings
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