I never had carb icing problems with the XT, so would not think of that as the first cause.
Important to know is that with lower temps the mixture gets leaner so with the choke off you might just 'pass the edge' at which the engine runs fine.
Another common cause for problems might be that the choke plunger (left side of the carb, where the calble goes in) does not fully return to the 'choke off' position initially. Then, when engione stalls and you kick it a bit around it does return to the choke off position because of the vibrations. Common problem with the 3AJ types as dirt and water flows into the bore of the carb via the choke cable. Remedy is to remove, clean bore and plunger.
Auke
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