I have a 2003 660 grizzly. When first starting my bike for the day it has a bad bog. I have to let it sit there and idle to warm up before it will even move. If I try to give it gas to soon it just bugs and dies. It has a k&n filter. I installed larger carb jets but made absolutely no difference

 

are you new to this wheeler? Every 660 I have owned is cold blooded as hell

 

This is the first grizzly I've owned. I had a 660 raptor before this and it was nothing like this. I could start it and go. I know they are cold blooded but this seems acessive