Hello Oscar, I humidly suggest that once you have the starting donkey in your hands, you would do some checks: If you have a boot small boil with tweezers you put a cable to the negative of the bat and the other end to the hous To many revolutions if it does not change coals, then it has a w/ wrench twist touches there with the + cable and if the blessed advance is that the seleneoid has no problems if it does not change it disarms the donkey fix if there are no metal residues in the fields or in the coil although I recommend that you change the caps of the rear cover of the donkey and the cap in the gearbox where the donkey supports. The teeth of the blessed and the crown teeth are a good cleaning change of caps, coals a sandpaper to the collector ... a hug