I also agree. I will add that a worn out (thin) muffler will also heat up very quickly. But even a wore out muffler shouldn't glow red hot that quickly.
So, it's time to:
*Pull the engine to remove all the tins and clean it.
*Overhaul the fuel sytem
*Tune it up (clean/file points, change: spark plug and wire)
*Readjust the governor
While it's out, it's a good time to:
*Pull the head, decarbon the combustion chamber. (As hot as it's getting, that would be a really good idea. Make sure you don't already have damage from it.)
*Adjust the valves
*While you have the blower housing and tins off, find and paint the timing marks so you can see them to use when you tune it up and adjust the timing.
*Check the rubber ISO mounts for wear.
*Check the rubber driveshaft coupler for wear.
Fix and replace as necessary. The joys of a QL tractor!
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