Won’t start

Joel Chapman said
What would I be looking for on my check valve? My rebuild kit and the book I was using showed this as been a piece of rubber. My carb has a metal strap with a ball about the size of a bb in it.

You've prob got an older carb then.
No big deal. And unlike the umbrella seal, its unlikely to be damaged by reformulations in fuel.
All the ball needs to do is move off the seat during refill and back on the seat when squirting.

When I was talking about the cam and levers, I was referencing the external adjustment.

This rides on a plastic cam