Guys,

Just bought a 1999 400ex and looking for some guidance. Overall she seems in good shape, but I've now noticed that it doesn't seem to want to stay running at idle, even when its warm. At first it wouldnt start but after learning the two quick throttle pump trick before starting, I can get her fired up quickly most of the time. After that however, it sputters and wont run smoothly at idle and dies. It seems to run okay when I keep it moving.

I've posted a video to show you the problem I'm having.

400ex wont stay running

The air filter & box are squeaky clean, and the plug was slightly dry carbon fouled, but nothing that looked serious.

Any ideas on where I should start looking?

Thanks,

Brandon