R2800 on a CL215(as best as I can remember) Cold: Mags off, throttle closed, mixture ico. 12+ blades on the starter, mags on, 'tickle' (on-off-on-off etc..) the primer while advancing the throttle, and holding the starter engaged ( a third hand helps here!) Once she catches, primer on full, adjust the throttle to a decent idle (~7-800 rpm? IIRC) once that is settled, mixture rich, and primer off. lean out the mix a little to reduce plug fouling.
Hot: mags off, throttle open to the control lock gate, mixture ico. 6 blades, mags, tickle while closing the throttle, etc...