I have a ztrak 850a that was running fine the other day, I stopped it for a bit and went to start it back up but it wouldn't engage. I can hear the sylinoid click and the starter spin but the flywheel doesn't engage. I've checked the battery voltage it's 12.5, I'm getting voltage to the post when I turn the key, ive checked the starters resistance it's good, I've taken off every wire and burnished all the contacts. I've checked the flywheel and starters teeth and see no visible damage, cleaned it and put some wd40 on the shaft, I took the starter off and turned it over and verified that it not only spins but rides up the shaft as well, I manually advanced the flywheel 25 degrees 4 times and tried to engage different quadrants of the flywheel teeth, I even verified that the battery didn't unwire itself and reverse polarity because I drove it through a black hole, but all to no avail... Anyone have any ideas what it might be?