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XL 250 low rev misfire

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Hi All. Have a XL250r single carb. The problem is as follows .... starts fine runs fine until about of an hour of riding, it starts to miss at low revs (above idle approx 1500rpm)  wont pull. Stop the bike and it idles fine and revs out fine but if from idle you slowly rev it up it hits this area where is runs hard , miss fires and does a sharp crack of a back fire. Turn the bike off and starts with half a kick. If bike cools the gremling goes away but back after an hour. I fitted new coil, wire and plug. Any help appreciated 

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