Woods makes subframe backhoes for it but finding a used one is near impossible, if you do it likely won't have the right subframe, and new with subframe will cost you considerably more then picking up a used bh77
La401 wouldn't be a direct bolt on loader. You'd have to do some fabrication to make it work. And yes a 6' bucket could be a bit much for a 2100 depending on what your doing with it
I don't recall there ever being a 12" rim 8" wide in the 4 bolt pattern. There were some rare 10" 4 bolt in a wide but never seen a 12. The 2wd is a different bolt pattern but there were several wide rim's for that. The 4wd 7100 for a 12" rim is a skinny to run a 6-12 ag tire. I do have a good...
Have you looked under the seat where the lever attaches to the 3 point top plate and see if anything is jammed up there or debris keeping it from moving?
By the Pic it seems like maybe you could jb weld that but then you have to ask yourself why did it break there. That front case cover is a very expensive piece. It's a DIY if your mechanically inclined but is very labor intensive to get the transmission out. If you decide to replace that front...
Loaders for kubotas are very hard to find. Most people don't sell them after they buy a tractor. There are aftermarket loaders you can buy but will cost you. Good luck in your search
Don't limit yourself to just the la301. Pretty much any loader from b1700 b2100 b2400 b7300 b7400 b7500 b7510 b2410 etc will fit. Maybe a few very minor modifications
My apologies I'm a little more old school and I don't belive you'd have fuel come out of there. Have you tried opening that valve again while cranking it? If it starts then close the valve while it's running.