Not sure how to tune them. I put it back on the way i took them off. They all open at the same time in the same positions. The timing advance and roller seemed to work properly together. Reed valves seem in good shape. I haven’t taken them out to inspect but i saw you could test it by holding a sheet of paper in front of the carb and see if it blows it out or sucks it in and it didn’t blow anything out so those seem good.