I like to pump the primer(instead of holding), that way I can hear when the bowl is full. If I'm not paying attention it'll dribble out the airbox. Then I'll give'r half choke to start, and leave it on till I get to the end of the block and turn it off there. She alway's fires right up.
But like Joe said, each one is different. So try different settings until she fires up right away like she's supposed to.
As for longer, make sure your jetting is right for where you are, and your plug is a nice chocolate color(for mineral oil, synthetic is grey). And mix your gas correctly!