I have a super z with the 25HP Kaw. engine I bought used last year with 500 hours on it. Ran fine for a year then last week would crank but not fire. Rear spark plug had no spark(didn't check fwd). I installed a new rear coil and both plugs then the starter would click but not turn over. Tried charging the battery and had it tested and it was good. Now the starter solinoid has quit working. Probably too many attempts at starting. If I short across the starter solinoid the starter will click but not turn. Is all this a bad starter problem? Are these random or related problems?