Newbie needs help with /6 tuning

Thanks for all the advice everyone,

I checked the air-cleaner-good
The choke operates properly

After warm up I tried to adjust the idle mixture, the screw only turned in about 3/4 turn. The motor never stumbled and it seemed to make no difference. Looks like I'll be re-jetting it. Thanks for the carb rebuild kit suggestion I'll check them out.

I went ahead and adjusted the timing. 10* seemed to be the sweet spot.

Thanks again everyone I'll let you know how the carb rebuild goes, Matt