Still no start

If'n it were mine, I'd shoot some propane into the air intake. If it starts or trys to start on LP then it's a fuel problem. Any engine can run on propane without damage for a short time. If you've never tried this, you might try this on a running engine so you can see just how much propane to add to make the engine run well.

If no pop at all with LP, then I'd run a temp hot wire to the coil direct from the battery. If it pops or trys to pop, then add the propane in the intake. To stop the engine from running just remove the jumper wire from the battery. What this does is bypass any wiring or componet problems on the electrical side.

Still no pop, then most likely a mechanical timing problem.

T_Bone

Have you checked to be sure the firing order is not backwards? Just a thought if distributor rotation is backwards from what you thought.

I would think even with a vaccum leak, you could get some kind of responce.

If you need to move the tractor find someone with
a winch. They may be able to haul that tractor on
a rollback. My old Army buddy has one and he hauls all his antique Army vehicles for display.
Hal

TW

Does the choke butterfly actually close for start-up? You should be able to get those plugs wet with the choke on.
Just a thought...

Be careful you don't accidently ignite the carb cleaner - some of its pretty flamable.

Another way to check is to put your hand over the carburetor throat and crank. You should feel a strong pull - if you don't, there's likely a significant vacuum leak somewhere. If you're really, really lucky, you might be able to hear the leak hissing when you crank with the carburetor throat covered.

Good luck, keep up posted.

Keith