Hi james and welcome to the forum.

1. close the high needle (turning clockwise) until closed then open 2 3/4 turns counter clockwise, make the low needle flush with the collar around it, this should keep you going and be good for break in.

2. a symptom of overheating is the engine quitting and not restarting easily, do the spit test, put some spit or water on your finger and wipe the top of the head with it, if it sizzles and is gone in 3 seconds or less your too hot, it should take 5 seconds and evaporate slowly.

3. os a3 plug is a hot plug and great for these engines, i would suggest having a few extras, alot of times plugs go bad during break in.

hope this helps you out bro, let us know how it goes.