hi there has the bike always been like this ,also if used every day is it a good starter. i would cheak all the usual ,air filter ,electrical conections, have you got a good spark when it plays up. you may just have a sticky flow valve in the carb , when you remove the drain screw do,s fuel flow freely, do,s it get faster if you tap the carb to free the valve. also some carb cleaners can attack the rubber parts in your carb , i use wd40 if the carb is on the bike and complete . it may be worth taking the carb bottom off and removing the small screw holding the flow valve on if there is a small filter in there discard it, on my 43f this can be done with the carb on the bike also the jets can be removed ,and wd40 blasted around . it do,s sound a fuel problem but ? zigzag
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