Quail,
Enjoyed the fun on Sunday, will have to do it again, but not this Sun as am away.
The thumb screw in the side will probably be the throttle stop screw.This controls the hight of the slide/piston.
The other one will be the air screw.
I don't know the carb on this model, but I have a few small Hondas and yours sounds to be simillar.
Sam.