Bought a new 2008 snowmobile from yamaha and from the start it was way too load and they wouldn't do anything about it unless I payed to have them tear the engine down while still on warranty. Noise worsened over time with still no success from Yamaha motors. Later spent hundreds for tear down of tunnel/exhaust nothing found. Later engine blew apart with only 2400 miles. There again they said I would have to pay for tear down and I did otherwise they wouldn't even consider warranty. Then after spending more money yamaha said warranty expired" Tough Luck" and now I have a sled that has even lower value. A box of parts.