Jim Rosinski wrote:

Be darned if I know why this (waiting between cranks) works, but it
does. If anyone knows why or even has a theory, I'd love to hear it.
Jim Rosinski

You're hitting the primer before cranking? That loads the induction system with
raw gas, basically flooding the engine. When you wait a bit, some of that gas
vaporizes and the engine starts more easily.

Try this. Pull the primer back but don't prime the engine. Hit the starter and
while the starter is turning the engine, give it three shots of primer. On real
cold days, it may take four. That gets my O-320 going every time.

George Patterson
The desire for safety stands against every great and noble enterprise.