milky oil

Hi all, Brand new to 'bergs and this forum. Got an '04 450 SE that had a broken timing chain. Got the top end all put back together. Runs great, but I can't keep water out of the oil. As soon as I fire it up, the oil in the sight glass goes cloudy/milky. I've replaced the water...

So long long ago in a place far far way my 11' FS570 quit working. There are some things that happened that Im not sure if they are all related.... 1. My 570 is a snowlike (google timbersled if you do not know what this is) 2. For reasons I can not understand It burped oil out of the air box...