Cold weather and a motor that doesn't run at regular operating temp because you are lugging it a lot. Before you change your jetting drastically change your premix oil if you are using one with a high flashpoint (above 100C or 212F). I don't know about oils available in your country but here are some in the USA.
Amsoil Intercepter, Amsoil Dominator - both good
Amsoil Saber - bad
Motul 710 - good , Motul 800 - bad
Champion WP2 - good
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