Choke question

Farmall Cub Forum -- Questions and answers to all of your Cub related issues.

Moderator: Team Cub

Forum rules
Notice: For sale and wanted posts are not allowed in this forum. Please use our free classifieds or one of our site sponsors for your tractor and parts needs.
Posts: 3
Joined: Mon Feb 13, 2017 8:55 pm
Zip Code: 27350

Choke question

Postby DABOOTH49 » Tue Mar 21, 2017 8:37 pm

My 1950 Cub is running great. All new wiring, new plugs and plug wires, converted to 12v (alternator/coil/12V more magneto). New starter switch. 12V light bulbs. I got a belly blade from a member 2 counties over, and it works great. I live on the end of a 3/4 mile dirt/gravel/hilly/curvy road, that's what I need the Cub for....and for the once every 2 year significant snow.
The Cub starts immediately now (instead of 25 tries with the tired starter switch and magneto) and runs fine.
Here is the question: As soon as it starts, I push the choke arm forward about 20% of its full travel, and the Cub is very happy at that point, and seems to have plenty of power. If I push the are forward any further, the engine starts to sputter a bit and is no longer happy. Is this an indication of some problem? Or maybe lots of Cubs do this and I am just not aware?


User avatar
Team Cub
Team Cub
Posts: 21576
Joined: Tue Aug 07, 2007 3:39 pm
Zip Code: 45030
Tractors Owned: At This Time
40 Farmall Cubs (Round Hood)
2 Farmall Cub (Square Hood)
2 IH Cubs (Square Hood)
5 Lo-Boys (Round Hood)
2 Lo-Boys (Square Hood)
2 Farmall 404's
1 Farmall H
1 Ferguson 20
1 Cub Cadet 125
1 Kubota B-7100
Circle of Safety: Y
Location: OH, New Haven (Hamilton County)

Re: Choke question

Postby Barnyard » Tue Mar 21, 2017 8:46 pm

Remove the metering jet and run a thin copper wire through it and then spray it with carb cleaner.
There are two ways to get enough Cubs. One is to continue to accumulate more and more. The other is to desire less.

Circle of Safety

10+ Years
10+ Years
Posts: 3166
Joined: Thu Nov 09, 2006 11:26 pm
Zip Code: 61722

Re: Choke question

Postby SONNY » Tue Mar 21, 2017 10:20 pm

The jet hole is so small that a piece of dust will partly plug it. There is no real high pressure or high flow to keep the jets open!---I have found what looks like a hair sitting in mine several times.---Don't know where they come from or what they are, but you can't choke them on thru, so you take the jet out and ,(I use air to blow mine out with )--and clean them. Some times you have to fight them several times to get them clear! thanks; sonny

User avatar
5+ Years
5+ Years
Posts: 3265
Joined: Mon Mar 19, 2012 7:33 pm
Zip Code: 00000
Tractors Owned: 1956 Farmall Cub with Fast Hitch, F-11 plow, Disc, Cultivator, Cub-22 mower
Circle of Safety: Y
Location: Wa.

Re: Choke question

Postby Glen » Tue Mar 21, 2017 11:45 pm

If the main jet is open, and everything else is good, it could be just the engine's normal need for the choke. The choke needs to be partly on while the engine warms up, you have to adjust it to where the engine runs best. The Cub owner's manual tells about choke use in the Starting The Engine pages. :)

5+ Years
5+ Years
Posts: 583
Joined: Sat Jan 28, 2012 3:13 pm
Zip Code: 68803
Tractors Owned: 1948 Cub, Kittie; 1948 Cub, Harold; 1949 Cub, 49er; 1951 Cub, Tucker; 1951 Cub, Homely; 1956 Cub High Crop; 1957 Cub Loboy; 57 Cub Loboy w/fasthitch + 194 plow; 1958 Cub LoBoy w/FH, Popeye; 1961 Cub, Beater; #1-1962 Cub Loboy Dually (Originally Orange) w/Foot Throttle; #2-1962 Cub Loboy Dually (Originally Orange) w/Foot throttle; Yellow 1963 Cub Loboy and blade; 1970 Cub, Cubbie; and 5 other Cubs in various stages of disaasembly and disrepair; 1962 Cub Cadet Original; 2 other Cub Cadet Originals; Cub Cadet 100; Cub Cadet 124 w/Creeper; Cub Cadet 147; 2 Cub Cadet 129's; Cub Cadet 149; 1948 Allis Chalmers C w/single frontwheel; 1944 Formal H w/Tokhiem Cab; 2 One Point Fasthitch Carriers; #100 Fasthitch Rear Blade; 2 Sets Cub 144 Cultivators; 2 Sets Cub 252 Cultivators; 3 Cub 193 Mouldboard Plows; 1 Cub 193 Slatted Plow; 1 1948 Cub-54 Snow Plow; 3 Cub-54 49-5 Snow Plows; Cub #6 Tool Bar w/Disc Blades & Middlebuster.
Circle of Safety: Y
Location: Grand Island, Nebraska

Re: Choke question

Postby Cubfriend » Wed Mar 22, 2017 12:07 am

Another thing to check could be the gasket between the carburetor and manifold. Sometimes the mounting flange on the carburetor gets bowed and sucks extra air in around the gasket. You can check this by spraying carb cleaner around the gasket area to see if you pickup some rpm's. If so the carb. flange needs to be straightened and filed flat. Good Luck, Frank

  • Similar Topics
    Last post

Return to “Farmall Cub”

Who is online

Users browsing this forum: Bauerei, inairam, Poncho and 3 guests