Doug,
The screw closest to the cylinder is the low speed screw and what I would do is remove both screws and clean the holes out then replace the screws and bottom out gently.
Then back off the low screw one and a quarter turns and the high screw one turn. The machine should start and then set the low screw so you get a good response when you throttle up.
When that is good then start to adjust the high screw till the machine peeks then back off 1/8 turn.
