will not run without the chock pulled

tmoore213

New User
All of a sudden my 9N will not idle or run under a load with out feathering the chock. I have check the intake and put new hoses on the ends.

Now when the tractor is running with chock I hear a whistle from the vent hole in the bottom of the carburetor.

any ideals???
 
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; start by cleaning 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.

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

A vacuum leak can do the same thing. Get a hand propane torch and carefully spray it (unlit of course) around the intake manifold at the carb to manifold interface & the manifold to block gasket of the tractor while it is running. Or, you can use carb cleaner or WD40. If it speeds up, you found the leak. Sometimes (rarely) manifolds crack or get rust holes.

Lastly, when all else fails, you could have an air leak around the carb metering section. The likely suspects are leaky throttle shaft seals and/or a worn throttle shaft. Or, just a real dirty carb w/ clogged passages.

Bottom line: Probably 95% of "needs choke to run" problems are fuel related, but do not rule out ignition problems, contrary to what others may tell you. I?ve had that very same problem before w/ a rebuilt carb, fresh fuel & good flow & a tight manifold.......and it was a spark problem. But, that was unusual. 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!
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Bruce has you covered but I'll chime in that a recent quick but hard rain got some water into my distributor and the points had corroded causing the same issue you're reporting.
 
" got some water into my distributor"

Frontmount?

If so, time for some WD-40 & new gaskets.
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75 Tips
 
I had this problem on my 9n and it went away when I replaced the ignition switch.Bad ignition due to reduced electricity getting thru the switch.
 
I seriously doubt that this is your problem, but I had one that I sold to someone, that loaned it to his neighbor. When the neighbor brought it back, it had the same symptoms as yours. The man called me and I went over to look at it for him. The neighbor had actually pulled so hard on the choke that he flipped the butterfly valve 180 degrees past the stop. I would have told you that it was impossible to do that if I hadn't seen it. So when you pulled the choke cable it was opening the butterfly instead of closing it and vise-versa. I could not get the butterfly back in it's correct position on the tractor. I had to remove it and take it apart to fix it. Some people can break an anvil. :)
 
Couple of things to try and maybe help it a bit.
#1 when was the last time you serviced the air cleaner it maybe full of water and dirt which can cause odd problems.
#2 pull the tube off the carb that goes to the air cleaner. With it running put you hand over he air intake of the carb and choke it with your hand and do you best not to let it dies as in just as it is dieing pull you hand off. Do that a couple of times. If you have some dirt/rust in the main jet area of the carb that sometimes is enough to pull it out and have it working as it should
 
(quoted from post at 11:01:59 10/03/15) Couple of things to try and maybe help it a bit.
#1 when was the last time you serviced the air cleaner it maybe full of water and dirt which can cause odd problems.
#2 pull the tube off the carb that goes to the air cleaner. With it running put you hand over he air intake of the carb and choke it with your hand and do you best not to let it dies as in just as it is dieing pull you hand off. Do that a couple of times. If you have some dirt/rust in the main jet area of the carb that sometimes is enough to pull it out and have it working as it should

I just pulled the air cleaner off cleaned and put new hoses on so Don't think it could be #1 but could #2 cause the whistling I hear from the vent hole in the bottom of the carb?
 

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