Thanks for the replies... the plug looks black/really dark grey when I take it out. It dosen't look too bad, but of course the ped won't run. Change the plug, and wamm, it runs.
The air flow seems ok, I even took out the airfilter to try to lean it out a bit. I've got the carb adjusted as lean as I can and still have it idle. I'll try adjusting the float so the fuel level is a little lower. Other than changing the main jet is there any other ideas to lean it out a little? Also, the ped is 20 yrs old, but has only 1200mi, would the main jet be worn with these low miles? Or is this why pa50's were never big sellers?