Shynon 7,482 #1 Posted August 12, 2019 After many carb cleanings my 520 loader is still running rough. Plugs are sooty black after a few hours of run time. I don't see any high speed adjustments. Thoughts Share this post Link to post Share on other sites
lynnmor 7,824 #2 Posted August 12, 2019 Is the choke wide open? Is the float in good condition and set correctly? Is the air filter new? Are the valves adjusted correctly? Did you check the compression? Share this post Link to post Share on other sites
