Usually "The Last Mohican" of hard starting that anyone wants to discuss is low engine compression,,
Before I looked into that,, I would drain EVERY drop of the fuel,,
out of the tank, filters, and lines,,
and refill with at least 5 gallons of fuel that is 100% fresh.
My 4105 was delivered with some strange fuel in it,,
I did exactly that, drained every drop, and refilled with fresh fuel.
The tractor became amazingly easy to start!! :thumbsup: