Since the weather has started cooling off I have been having trouble starting my girlfriends 400HO. It does not matter what position the choke is in it is very hard to start. Also after running for a few hours it still does not want to start or stay ideling. Before the temps started to drop it would idle steady around 1200 rpm.

Has anyone ever ran into this or could someone direct me on what to look for? The quad has around 2600 miles and 300 hours on it.