Hlo sir my pulsar 220 f 2010 model is facing some issue from last 2 mo

Hlo sir my pulsar 220 f 2010 model is facing some issue from last 2 months that whenever i tried to self start my bike on morning it not start on several selfs at last some acceleration throttle is applied to start the bike i visited service centre but they are unable to find the cause of issue. One more thing after engine gets hot it causes no problem and start without acceleration throttle.

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