All the above but I would Sea-Foam it hard when you start cranking it. Put a gallon of gas in it with about a 1/2 can of Sea-Foam. Cycle key several times to make sure carbs are full and leave sit overnight. Might crack drains to make sure carbs are getting fuel. Get them full and leave sit overnight before firing up. It will belch, cough,hack,fart,and carry on but will smooth out as it gets its breath!!Crap it belches out you sure don't need. Run that gallon thru at all different speeds. Fill up tank and add rest of can. GO RIDING!!!