1950 JD B is hard starting?

[JEK1]

1950 JD B is hard starting?
Dear Sirs,
I have been working on fellows JD 1950 B that is hard starting. We crank the machine and feather the choke for about 15 to 20 seconds, it pops and finally it starts. It then runs pretty good full throttle, mid-range and idle. Turn it off, wait 15 minuets, and you go thru the same thing again. One has to be very careful not to choke it too much or it will flood.

Thus far we have rebuilt the carburetor and all passages are clear, replaced and set the float level, replaced plug wires, spark plugs, points and condenser, verified timing to be at TDC manual and with timing light, checked compression to be at 110 psi.

We have separated the air cleaner pipe from the carburetor to verify if the air cleaner is plugged. No difference in this condition.

When we started working on the tractor, it was hard starting and after all that, it is still hard starting.

Does anyone have any suggestions on what else could be wrong or what is being overlooked?

 

[Rich'sToys]

Does it have a magneto? If so, what shape is that in?

 

[ET]

Yes a weak coil could be your problem.

 

[MrMark]

Also, when checking the spark at the plug, the spark should be blue, Not white.

 

[JEK1]

The tractor looks to have a strong spark. I will check color. Thank you.

 

[JEK1]

The tractor has a distributor not a mag. We went thru that pretty good. I do have a spare hot mag that I could put on it. Thanks for your reply.

 

[JEK1]

We have spare coils that we could swap out. Thanks for your reply

 

[teddy52food]

Get those condensers tested. You had a weak one & replaced it with another weak one.

 

[Rich'sToys]

Sorry. I missed the part about points and condenser in the original post. My apologies.

 

[PopinJohn]

I had that problem with dad’s 1950 B.
Looking in the choke end of the carburetor,
there is an atmospheric bowl vent at about
3 o’clock. Horizontal passage.
Ours was clogged shut with dirt. Only took
30 years to discover.