Getting no spark and have checked everything but the genterating coil output and the MPEM box.The ski was running but every once in a while it would loose power and die but would restart fine with no fail thought is was the gas but then it stopped running all together and checked for spark and it has none ,ALSO HAVE CHECKED THE START/STOP SWITCH THE PRIMA. COIL THE MAG.AND ALL ELSE THAT IT SAYS TO CHECK IN THE BOOK EXCEPT FOR THE ABOVE MENTIONED GEN.output AND THE MPEM.any help would be very nice thanks Dain