I tune starting with the high end warm the engine then advance the throttle to full. Adjust the the high end so the engine is at peak RPM by ear then richen about a 1/4 turn bring it back to idle and check the low end. Check the low end by pinching the fuel line between the carb and needle valve. The engine should run for a second or 2 before it begins to rev and die. If it dies right away you're too lean. If it runs for awhile before it does anything you're too rich.
the true test let it idle awhile and slowly advance the throttle it should tradition smoothly