I bought my first Ski-Doo last week, a 2001 Grand Touring 500, DPM carbs, with 1400 miles showing on the odometer. After getting home I noticed it had no "500" or registration stickers on the hood, so it must have been damaged and replaced, the rest of the sled doesn't appear to be damaged, but I'm concerned. It smokes way more than any other I've seen, although it seems to run fine and hasn't fouled a plug. The seller (second owner) didn't have the manual, so how do I check the oil pump? Would the RAVE valves affect this if sticking? The idle speed is about 3000 RPM which seems too high, how is that adjusted? Also, it makes a clinking sound like a barn elevator at slow speeds, especially when turning (straight moderate and high speed seems fine). Is that sound normal, if not what should I check? Thanks for your help.