Murle told me using the choke with the non-ignition spin works like the primer on a Continental. It atomizes fuel in the venturi. This is with no throttle so not much fuel is available. When I turn ignition on i advance the throttle 1/4 inch. Engine starts smoothly at circa 2500 rpms that I bring back to 1800 until I start to see the oil temp come up then i warm up more at 2000.