I have Cab Cudet LT1050. We attached a snow blower this winter. It is hard to start the engine in winter though we changed the oil and filter. After a few time uses, it started having black smoke from engine. What is wrong with it and how to fix it?

Hi,
Replace the air filter. Sorry that sounds so short, but that is what causes that, mostly.
Peace,
Clarke

Thank you. Yes, the air filter is dirty so we changed it. However, we still see back smoke and engine does not sound right.