Need help with Case 646-77

[lawnscaper]

Hi Everyone, I'm new to this forum and would greatly appreciate any feedback from someone who knows a bit more about these tractors than I do, I have had this tractor for a couple of years and recently it started cutting off after running for 20-30 minutes of use,I would like to fix the problem before I try to sell it because of lack of use and not enough time to restore it like it needs to be done. It is a 646-77 with the 16hp Onan engine which runs fine until it heats up. I'm thinking maybe coil?

 

[Xfaxman]

The guys that know about your tractor hang out in this forum: http://www.tractorbynet.com/forums/case-ingersoll/