I test drove a Viking today. Reason being I sold my 660 rhino due to needing more room a year and a half ago. Polaris 800 hd was a good idea at the time. I never had a problem from the 660 other than room. Now I know why I never had problems. The drive belt system in the Yamaha is much better. The only problem I see with the Viking was at idle the steering wheel and dash has a bad vibration. A bit more engine noise but not as loud as the 660. Anyone have problems from this dash vibration.