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Okay so here's the deal I really need some help I got the quad from my buddy he had the head redone because of smoke it was either two things rings or valves so all that looks good I got the exhaust valve and intake valve to spec with the rocker arms then I had made sure cam was in TDC it lined up in spec then I was trying to start it up for the first day it started but ran like s*** then I had the next day recharge the battery and tried to start it again still run like s*** but I was just curious if it ran so I was thinking it was taking too long to start up so I clean carburetor today and retried to start it up and the only electrical part that was disconnected was the ground to the reverse gear controller so that I could take off the throttle then I pulled the spark plug out to check to see if I had spark the last 2 days I had spark cuz I pulled the spark plug out and seen it but today when I went to clean the carburetor out I accidentally left the battery on on all night and now I have no spark at all I pulled off the spark plug boot the screw thang and put my hand on the spark plug wire as I turned it over with the starter by the way the starter runs great now but zero electricity I'm just wondering how do I test my coil what is the resistance/ohm's it needs to be inspect I can't find it nowhere and how do I eliminate the fact if it's the stator somebody says something about a CDI and I seen a form saying if I unplug the voltage regulator your spark plug might spark again but I clean most of the connections I still have no spark

i have 2 sportsman 500 1 is a 97 and the other is a 99 the stators went out and i replaced them with new ricky stators units both atvs ran great about 5 or 6 times than the stators quit anybody else have this problem?