I have had two F300's, the first one was hard to start, even after placing an aftermarket manifold, and rebuilding the carb.
Acted just like you described, when it was cold I had to remove the air breather and cover the carb with my hand to get it to start.
The one I have now started in the recent 19 degree we had during an ice storm on the third revolution. I believe a correct tune up where it starts easily is the trick.
So many tractors now have the 3 9/16 fire crater or stepped pistons put in them and I believe many people are unaware of the distributor advance differences, carb setting/ jetting between original flat top piston equipped engines & the new higher compression ones.
I believe the issue is in the slow jet side of the carb, I also know the choke butterfly in the carb has a small "flap" built into it to prevent over choking. That may be the culprit, but you will need to ask someone much more experienced than me that knows the issue and how to fix it.
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