I TRASHED THE ENGINE OF MY 650 KAW ATV, REALLY DESTROYED IT. I WAS TOLD BEST BET WAS TO JUST SWAP OUT THE ENGINE. I PURCHASED A USED 2006 ENGINE, THE ATV IS A 2004. I'VE FOUND THAT THE CARBS ARE DIFFERENT ALONG WITH THE COOLANT LINES (SO FAR) WHAT OTHER PROBLEMS AM I GOING TO RUN INTO WITH THIS SWAP. 1/30/08-- BOY DID I SCREW UP, ENGINE IS FROM 2006 WITH INDEPENDANT SUSPENSION--MANY DIFFERENCES WORD TO THE WISE "DON'T TRY THIS AT HOME"