My 99 345 with 500 hours has always been cold blooded. On a normal start I had to play with the choke to keep it running for the first 30 sec. Now it will not stay running without the choke even after it has warmed up. It runs real good with the choke half open, it dies if you release the choke. Thinking carburetor I dumped in some Seafoam. No help.
The tractor worked great just last week.