Endplay should be very little- did you check the area where the arm sweeps with machinist's blue or magic marker? Other spots to check are the bottom of the arm and the top round part- shouldn't be any rub marks on the carb body. You can view the PW site photos by joining the site- it's free. On your carbs- when the throttle plate is completely shut, is the spark advance hole above the lip of the plate? The directions say the hole should be 1/16" above the throttle plate lip- no way that's happening with mine without some filing! The hole is the small one next to the upper idle crcuit hole (considerably larger dia). Thanx.