Ok, the carb is actually a 650 CFM. I corrected that at the sale post.
I tried taking the plugs out. No can do. They put them in too tight. I was afraid of breaking one. I tried loosing plugs 1-6, gave up.
So, carb and timing is still on the list. I've seen two good videos on this particular AVS2 carb. Lots of different tuning from front screw adjustments, to pump adjustment, to secondary spring adjustment.
I know its been said to death, and everyone has given advice as to changing the throttle cabling setup or adjusting it. Can we start there...again?