Where do i start?

[pknier]

I am out on the water and the engine cuts out.... took apart and checked the carburetor and fuel Is good. Cleaned up points they weren’t bad. Ran yesterday for 8 hours With acouple of shut downs be would start right up, then cut out after 8 hours would not restart... sat for 20 minutes ...it started but run rough in gear would draw rpms down but ran. Cleaned points and it ran well this morning ra for an hour and cut out. Was able to sail for an hour while i took carburetor apart And found nothing. Put back on started and ran for 30 minutes and cut out again. Will not start. Waiting to see it cooling off helps. BTW ..new coil last fall. Where do i look for connection and whatever that heat up and cause shut down?