rebuilding older motor,has uflex single leaver top mount control,new cable. can not get butterflys to fully open when starting from closed idle position. i can get full open,or full closed but not both at the same time. linkage at engine seems to require 2 in. travel, there seems to only be about 1 1/2 in.from cable end. what am i missing? wrenchman, but this is new to me.