Hy zoegrant, measure the diameter of the starter armature shaft, I can check my starter shafts to confirm the measurements but I know the six volt armature shafts are larger in diameter than the twelve volt armature shafts, these are metric dimensions. That is the reason why we can't simply swap starter drives to get the voltage we want with the drive we want. Okay I measured the shafts, 12 volt starters have 12mm shafts and 6 volt starters have 14mm shafts, hope that helps.
Last edited by 3B; 04/25/2016 7:58 PM. Reason: added shaft diameter measurements.
