Reply to "MTH Z4000 throttle handles are a little loose."

unfortunately the z4000 transformer the potentiometer goes bad and causes erratic readings or voltage stop completely ,mth does not have new potentiometer at the moment they are. Trying to get a new vendor. But have had no success so far. Mth and 2 other asc techs are the only ones that mth will let them be repaired otherwise  you have to send yours in for repair, as far as the handle. There is a spring inside that keeps tension on the throttle lever so it won't drift. I would send it to mth as I don't believe any asc techs that repair them have the potentiomers to repair your transformer!