hopefully it is running parallel to the engine........ un hook the lever from the carb, make sure the trottle is forward (idle), pull the kickdown forward and screw (or unscrew) the slotted 'head' of the lever until it just clears the lever part of your throttle linkage (the furthest back point of the slot). that should get you to a 'ballpark' area where you can take out and tweek it until you get it to down shift where you want