NAA ENGINE TROUBLE

[Soundguy]

If it runs fine on the battery jumped, you have a fail in the ignition wiring.

Ps I doubt your coil has an internal resistor vs the correct number of turns of primary wire.

 

[sashooter]

A napa 12v IC14SB would be the correct coil for it?

 

[Soundguy]

yes... ic14sb no internal resistor. it's primary is merely wound with the correct number of turns of the correct diameter wire to make the correct primary resistance.

 

[sashooter]

If by chance it runs still the same with coil wired directly to battery, then I check fuel. I did happen to pull plug on float bowl of carburetor, and I had fuel running out of plug at a good rate for about a minute or two with no change. I did notice the spark plugs were black with soot on them. That could mean it may be running rich. When I first drained it there was a bunch of crud that came out of it.

 

[Soundguy]

Rich, yeah. And that can be plain too much fuel or a vacuum leak

 

[sashooter]

A vacuum leak can develop at the intake manifold, and carburetor. Can there be a leak anywhere else on the tractor? What is a good way to test for them?

 

[tmajor]

The best way, that know of to check for vacuum leaks, is with a flammable aerosol. WD 40 or some other flammable spray. When sprayed in the area of a vacuum leak, the engine rpm will smooth out.

 

[sashooter]

Up date

Well after redoing all of the primary and secondary rewiring except the condenser. Which was the problem the tractor is running how it was when I got it. Which is fine. It starts right away and runs well now. Well maybe.

It runs the best with the idle jet seated all the way in. So I don't know if it would be that part of the carburetor circuit, or something else with the engine to look at.

 

[Soundguy]

Idle needle in enriches, out to lean. ( air needle)

Main is a fuel needle, out to enrich, in to lean

 

[sashooter]

The needle is seated all the way tight. It seems it could of kept going to actually make the engine run better. It still runs decent. The main needle I adjusted to where the engine struggled then backed it out to where it is running good with that part of the circuit at a high rpm.

So I don't know if there is something not right with the idle circuit. Or if it could be getting its air from some other faulted source.