I was mowing this past Saturday when suddenly my 1450 shut down on me. I know, I know, I read the FAQ's that talk about the exhaust valve sticking and I am really hoping I have this problem. But it seemed too easy. It started after sitting for about 5 minutes but wouldn't stay running. What are some of the other signs when the valve sticks. I initially noticed some smoke from in front of the carburetor and thought that the new drive belt was rubbing awkwardly on the mule drive. Can someone give me some good news. I don't want want try and start it and cause further damage if it is not the exhaust valve. If it is not the valve, any suggestions. It was really running well prior to this problem...