I would say dusting an engine is a bad thing. Very bad - the dust would act like sandpaper and would take out the rings and cylinder walls after a short time. It wouldn't hurt the valves, but it would be bad news for the bottom end. Anything that will help prevent the engine from sucking dust will make it happy.
I spoke too soon about mine not smoking, BTW. I traded it in today on a Can Am Maverick (I will make a post about that shortly, just wanted to answer this one first). When I started it up to take it off the trailer at the dealership it emitted a cloud of thick, blue smoke and kept smoking for probably about a minute. I was mortified, because the salesman probably thinks I was trying to dump a broken machine. Nothing could be further from the truth - as I said in another post I had been considering a SXS due to a wrist injury that makes operating the Kodiak (or any other ATV) very painful. Aside from those few cold start issues this machine had been trouble free. The paperwork had already been signed when the smoke show started, but I told the salesman that I would undo the deal if he wanted, after seeing the smoke. He wasn't worried, though, because the bike still has warranty until April.
Now I'm off to make my official "Bye, Kodiak" post... :crying: