Two Questions about a '45 B

I have a couple questions on a B that I have good and running now. I have gotten to this point on this tractor thanks to many people here on this forum.

1. Recently put in a new distributor tuneup kit and a new ignition switch (it was done by a shop so the gaps are hopefully correct). Also put in new brushes and bushings in the starter. The tractor starts and runs great, but now all of the sudden when I push down on the ignition switch to shut it off, it wont quit (I have to choke it). It didn't do this the first several times I ran the tractor after replacing everything. What might be causing this?

2. I really only use about half of my throttle to go from low idle to full throttle. I am actually starting the tractor about mid range on the throttle assembly. Is this normal or should I try to adjust the yoke on the governor to carb shaft? My tractor repair guy said that this is something that I shouldn't necessarily worry about. Otherwise, what all needs to be gone through to service a governor?

Thank you very much for your help in advance!!

Did you put an alternator on it? I assume when you said distributor that means you don't have a magneto?

Your sw doesent sut the volts off going to the coil. It should have two wires going to the sw with bat voltage on one side the other wire goes to the coil. Your gov input shaft has play and wobbles all around thats why your throttle response is bad. Mite also need a new gov spring as he old one could be weak. But the wobble on the input shaft makes for poor gov response. It needs a new bushing that will improve your throttle response. Ive done them many times with great results.

Choking it to stop it has bad consequences. For one it floods the engine with gas and carbons up the plugs. Two it puts raw liquid gasoline on the cylinder walls which causes dramatic wear from washing the oil away.
Try this: remove the wire from the side of the distributor and replace it with a jumper with alligator clips on the ends. Run the tractor and when started, remove the jumper to see if it stops.
If it does, the ignition switch is shorted across the back oe defective. (assumes it has a generator for charging) Jim

Janicholson,

Can you describe #1 a little more. Like what happens when you push the switch in. It tries to shut down but runs on or nothing changes and it keeps running as it does with the switch pulled out.

The correct answer will be completely different based on the answer to this situation.

jkmdg84,

Sorry, I meant my above post for you. I addressed the wrong person.

Thanks,
Brian

I hate to state the obvious, but it can be 1 of 3 things.

If a a magneto system
1.) The body of the ON/OFF switch requires a GOOD ground to the frame.
2.) The switch could be bad.
3.) there is a faulty wire

If a battery ignition system:
1.) The switch is bad
2.) The switch is bad
3.) the switch is bad

PS Edit: if it is a battery ignition system, try starting it with the switch in the OFF position. If it starts, it is not wired correctly, or the switch is bad. :wink:

The ignition switch (original push in to stop, pull out to run mushroom headed switch) for a distributor/coil system gets its power from the amp meter. The power goes from there to the coil negative terminal (assuming original positive ground). If the switch is broken inside, or the wires are shorted at the back of the switch, the ignition may stay on all the time. Battery would run down, coil overheat, and it would continue to run.

If the ignition switch is working and wired correctly, and the engine chuggs and sputters when shut off, but continues to run, what is happening is called dieseling. It is caused by carbon hot spots in the combustion chambers, or incorrect/worn spark plugs with a high heat range, or an idle set way too high.
The idle should be in the 500 RPM area such that it has little incentive to keep running when shut off.
The throttle lever on many letter series tractors only works from 40% to full throttle. (Kinda normal) if the governor arm on the back of the governor is moving fully in both directions, it is as good as it gets.
I would suspect idle speed first (only shut it off at idle and after maybe a minute of idling to allow temps to stabilize.)