Some help before I start this engine I bought and blow it up. On the control box is a lever that lifts up, a choke on ignition key switch that is pushed in with the key and a knob below the ignition key. What is the lift up lever for if the choke is on the ignition key switch? What is the knob for? Is there anything I should spray into the cylinders or do to the carbs before I start the engine?<br />Thanks Wish I had an owners manual! 