NEED TO USE CHOKE

[ia mark b]

After my 1941 9n runs for awhile I have to use my choke to keep the rpms up? Any body got some ideas why? Thanks Mark

 

[lha]

Check your points,for a start.---lha

 

[Bruce (VA)]

Pulling out the choke gives you a richer mixture. So, you could have either a fuel or spark problem.

A carb out of adjustment will also cause this problem; set the main jet at 1-1/2 turns out & leave it alone.

A dirty carb can cause the problem as well; clean the fuel screens.

Dirty/old gas, or water in the gas can cause this problem.

Restricted fuel flow can cause this problem; remove the bolt at the bottom of the carb & check for flow.

A vacuum lock due to a plugged vent hole can cause this; loosen the gas cap & see what happens.

On my 1950 frontmount, needing choke to run is the first sign that the points need adjusting/replacing.

Old plug wires can cause the same problem.

And, finally, a vacuum leak can do the same thing. Get a hand propane torch and carefully spray it (unlit of course) around the intake manifold of the tractor while it is running. Or, you can use carb cleaner or WD40. If it speeds up, you found the leak.

Bottom line: Probably 75% of "needs choke to run" problems are fuel related, but do not rule out ignition problems. Just check the likely fuel problems first.

Please be sure to post back & let us know what the fix was. We all learn something if you tell us what worked!
50 Tips

 

[ia mark b]

I'll give every thing a try this Saturday. Thanks for the sugestions. And I will report back. Thanks Mark

 

[blitz]

jump out the ignition switch, see if it runs better

 

[souNdguy]

will be looking for your post.

could even be a crack int he manifold opening up when hot, leaning the mix out.

post back.

soundguy