What is the 0-60 time on a stock 2005 Yamaha raptor 700 atv and a stock 2005 Yamaha YFZ450 atv?

That would depend totally on the types of surfaces you are riding on. ATV's are designed for offroad use, so how fast you get to 60 woudl depend on a million different things. Having said this, either of the ATV's you mentioned are probably the fastest ATV's around. They will scare the S*** out anyone but the most experienced riders.