Proper sequence for starting radial engines...DC-6B style, with P&W R-2800's.
Engage start and start safety switches.
Rotate thru 9 blades.
While continuing to rotate the engine with the starter, engage primer and ignition boost switches, and at the same time, select magnetos to 'both'.
When engine fires, continue starting with the fuel primer engaged, releasing the start and start safety switches.
Slowly move mixture control to the autolean position, then release fuel prime switch.
Engine continues to run (hopefully).
Taxi in autolean, until engine run-up desired.
Complete run-up and propellor checks in autorich.
Return mixture to autolean.
Prior to takeoff, ensure engine mixture controls are in autorich (very important).
Have a pleasant day, thereafter (hopefully).
DC-3 about the same, except...use autorich for all ground ops.
Engine type, P&W R-1830-92.
Curtis Wright engines...can't remember.
Stratocruiser, same as the DC-6B.
DC-7 and Lockheed 1649, same also, as the DC-6B.
NB.
Operating in autolean helps to prevent plug fouling while on the ground.