Choke question

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DABOOTH49
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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 battery...no 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?

Thanks
Dabooth49

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Barnyard
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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.
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SONNY
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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
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Glen
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Re: Choke question

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

Hi,
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. :)

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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
Frank


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