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Oil in sight glass on 2012

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I have a 2012 YZ450f and I just rebuilt the top end.  I had it started and running but didn't have my valve cover gasket on right so I lost some oil, I fixed the gasket and put some more oil in.  I started it again let it warm up and turned it off and took the overfill bolt out and nothing really came out.  The I started the bike again and it idled for about 1 minute then it died and haven't been able to get it started again.  So i drained the oil cold replaced it with 1 quart, and now i kick it about 20 times the sight glass fills up and its not draining.  Do I still have too much oil in the engine and is that what's causing it not to start or did something else go out?  Very frustrated!  Thanks in advance!

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