Went back out to shop. Checked fluid levels. Radiator was full, Res. down 1/2 way. Started bike..let idle...started steaming out of top of rad. Got a flash light..looked close...steam coming from just below of top tank...pretty good rate. Thought "maybe" it was sloshed out fluid at first, but don't think so after running it for a few minutes. When I first got bike I could detect a small antifreeze odor. Bike had sat for sometime, so kept an eye on it. Never saw it drip or blow back onto bike. Could maybe rad. have had a pin hole leak, and me putting in new low silica fluid caused it to fail even more? Fluid I took out did not look any different than Green Prestone. I know molecules could be different. Does that make any sense? I may have to presure test rad. to find out. Any other ideas?