wow-in my experience the mogul doesnt need help-re pick up-
however here's some ideas to help you
some stuff to think about and check :
obviously is the cable connection to the engine-check for continuity-these cables can be worn and break internally , especially if the cable was used to pull out the plug from the engine--if so-the plug can be carefully prised and removed-the cable trimmed a tiny amount, and the cable reattached to 'bite' through the wire casing into the strands-try to remove the plug from the engine using something other than the cable in order to avoid this inevitable problem
the sliders should slide freely-sometimes they need a touch of oil -they can get dirty and hang up or down-
check each brush on the drive and tender wheels-these can wear out unevenly and rsult in one side touching and the other not-or sometimes can become 'hung up' on the inside lip of the cylinder which holds them-and tehy never reach the wheel surface
try checking the spring pressure for the brushes too-it should be soft but enough to keep the brush against the wheels-more pressure is NOT necessarily better-ie do NOT stretch the springs-this causes more friction and drag and can also push the wheels to one side of the truck frame when unequally pressured- and create uneven wear
get a fine quality metal cleaner and, by hand,polish the inside wheel surfaces if need-you can also use a track cleaning 'eraser'-go easy when polishing-nothing too abrasive-