New Guy - Need help with 1949 Cub Gov

[jeremyjbs]

Hello all, I have been reading the form for quite some time and got a lot of good information. Just actually registered to ask a question I cannot find an answer to. I have a 1949 IH cub, and I have replaced the carb, unstuck the pistons, and replace most of the gaskets. It starts and runs fine for 30 seconds on choke then the governor kills it. At least that is what it seems like is happening. Anybody know how to get this fixed up. I appreciate your knowledge.

 

[Mike(NEOhio)]

If it won't run without the choke you have a fuel issue. Start by making sure the fuel flows good.

 

[used red MN]

Hello Jeremy welcome to YT! I am going in the same
camp as Mike. Unfortunately, post about cruddy gas
tanks, gooped up sediment bowls and lines as well as
gummed up carburetors are not the most exciting
reads. However, it seems to me this is probably where
your focus should go. I usually preach checking fuel
flow at the drain plug at the bottom of the carb. This
time I will suggest to first disconnect the line from the
sediment bowl under the tank. Open the valve, you are
looking for a steady flow that does not slow down to
just a dribble. If that is good I will ask is there still a
screen in the top of the sediment bowl? There should
be that is essentially the fuel filter. If flow was good
connect the line to the sediment bowl and then unhook
it from the carb to check if the line is open. Now the
reason I asked about the sediment bowl screen is if
that is not in there and since you said you had to free
the pistons that is telling me the tractor sat around a
while. Now you are dumping gas in the tank and maybe
driving it around sloshing fuel around in the tank. This
is likely stirring up all kinds of crud in the gas tank. The
little dirty secret is that the elbow fitting that screws
Into the carb that the fuel line screws into may have a
fine screen on it. This is your last line of defense, if
that screen in the top of the sediment bowl is not
there. Pull it out and check it. I am not a Cub expert
and looking at the parts diagrams I see maybe some
carbs on them did not come with this. After that is all
checked out now pull out your carb drain plug and
make sure there is a continuous flow there that does
not slow to a dribble after 5 to 8 seconds. If that is
good you should be good to go. Do yourself a favor
and with a good flashlight look down in the bottom of
the gas tank and see what kind of crud is down in
there. A flush out of the tank with the sediment bowl
removed may be in order.

 

[grandpa Love]

Adjust the valves, make sure the gas tank
is clean. Make sure every tiny passage in
the carb is clean. If the pistons were
stuck it's not hard to believe the
governor probably has issues, too.....
Take it off , clean it and replace the
spring on the outside. You can buy a cheap
carb off Amazon ( kipa brand) for $30ish
... Then you can eliminate a carb issue

We have a few Cubs. If you need anything I would be happy to help you with your Cub.

 

[grandpa Love]

Wait!!! 'Replaced the carb'..... Did you
buy one from Amazon? Some of them are
missing a hole. CNC machine apparently
broke a bit and the hole was marked but
not drilled through. Split the carb and
you should see where it should be. Just
match a drill bit to the divot, not
critical, the little brass jet dictates
how much air gets in. Feel free to call if
you want, I could talk cubs for hours!

Original IH carb and Amazon carb side by side. Red straw is pointing at the missing hole. Tractor will not run with out this hole getting drilled out

 

[jeremyjbs]

Thank you. I have been trying to carve out some time to get back out there and put your suggestions to work. I will update, hopefully in a day or two, when I've been able to try this out. I wonder, can I post video on this? I'd like to show ya'll how she starts, runs, then shuts down. Anyhow, I do appreciate you taking the time to help me with this.

Sincerely,

Jeremy