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Carb choke butterfly gets stuck closed
Posted by: 62corvan ()
Date: July 14, 2011 09:52PM

The subject line basically describes the problem. I actually have to push down on it really hard to free it up. What to do? Also don't have fuel squirt in the opposite carb. Seems like this happens more often than not. Yikes I wonder sometimes if it will ever get on the road.

Regards,
Jason.
Huntington Beach, Ca.

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Re: Carb choke butterfly gets stuck closed
Posted by: nikbristow ()
Date: July 14, 2011 10:29PM

One of my carbs has/had a sticky flap. I figured out that the screw on the end of the choke shaft had been overtightened several times and sorta smashed the metal hook-shaped choke-tripper thing that it tightens against. So now, if I tighten the screw down the choke won't move at all, even under force. So I just screw it in loosely and put some blue loctite on the threads to keep it from unthreading. Not saying that's your problem, but loosen that screw and see if the choke flap moves freely.

- 1964 Monza Convertible (No-name)
- 1964 Monza Convertible "Helen" (Rusty and crusty soon-to-be welding practice)


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Re: Carb choke butterfly gets stuck closed
Posted by: lgoodwin ()
Date: July 14, 2011 10:34PM

It may be due to the choke shaft being really worn. In any case, I'd oil the shaft on both sides and see if that cures it. If that doesn't work, polish the carb throat with steel wool and/or a polish to make it more slippery (do this with carb off the car and clean it out thoroughly before installing). Mother's chrome polish does a good job of cleaning and polishing carb bodies.

1962 Corvair 900 sedan1967 Corvair Monza 140/4-speed1968 Corvair 500 coupe1983 Mexican Mustang 5.0
1962 900 sedan needs a home1967 Monza 140/4-spd1968 500 coupe (now my son's)1983 Mexican Mustang 5.0

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Re: Carb choke butterfly gets stuck closed
Posted by: 62corvan ()
Date: July 14, 2011 10:44PM

both great tips thank you. Just to clarify, it is the actual flap that is getting stuck. Not the shaft. But I will try both.

Regards,
Jason.
Huntington Beach, Ca.

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Re: Carb choke butterfly gets stuck closed
Posted by: MattNall ()
Date: July 15, 2011 03:46AM

Adjust it so it doesn't go fully closed!!





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Re: Carb choke butterfly gets stuck closed
Posted by: lgoodwin ()
Date: July 15, 2011 04:21AM

MattNall Wrote:
-------------------------------------------------------
> Adjust it so it doesn't go fully closed!!
Oh, yeah, then there's that... Heh-heh

1962 Corvair 900 sedan1967 Corvair Monza 140/4-speed1968 Corvair 500 coupe1983 Mexican Mustang 5.0
1962 900 sedan needs a home1967 Monza 140/4-spd1968 500 coupe (now my son's)1983 Mexican Mustang 5.0

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Re: Carb choke butterfly gets stuck closed
Posted by: cnicol ()
Date: July 15, 2011 04:32AM

You should be able to loosen the retaining screws and reposition the choke plate at touch so it doesn't jamb shut.

Craig N. Coeur d'Alene ID.
66 Black Monza 4dr, 4.2L V8 49k
66 Red Monza 2dr 140/4 EFI 60k
61 Seamist Jade Rampside 140 PG
65 Cypress Green Monza 140/4 4dr
65 White 4-dr 110/AC/PG (parts)
64 GB -CrUnChEd (donor)


20 Tons of parts in boxes

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Re: Carb choke butterfly gets stuck closed
Posted by: Layton Curtis ()
Date: July 15, 2011 12:52PM

If you oil it the oil will get hot and hard over time. The best cure is to take it apart and get all of the oil and crud off that somebody used to free it up. The shaft is made sloppy and they get crudded up when you oil them.

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Re: Carb choke butterfly gets stuck closed
Posted by: lgoodwin ()
Date: July 15, 2011 07:50PM

Layton Curtis Wrote:
-------------------------------------------------------
> If you oil it the oil will get hot and hard over
> time. The best cure is to take it apart and get
> all of the oil and crud off that somebody used to
> free it up. The shaft is made sloppy and they get
> crudded up when you oil them.
If it needs cleaning, clean it first, then oil it with MOTOR oil (NOT 3-in-1).
It will work for years. The oil also helps seal minor leaks in the shaft.
If it ever gums up, just clean it off with some carb cleaner, and re-oil.

1962 Corvair 900 sedan1967 Corvair Monza 140/4-speed1968 Corvair 500 coupe1983 Mexican Mustang 5.0
1962 900 sedan needs a home1967 Monza 140/4-spd1968 500 coupe (now my son's)1983 Mexican Mustang 5.0

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Re: Carb choke butterfly gets stuck closed
Posted by: 62corvan ()
Date: July 15, 2011 07:50PM

Awesome. Thank you all.

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Re: Carb choke butterfly gets stuck closed
Posted by: cnicol ()
Date: July 15, 2011 08:33PM

IMO, this issue is likely not related to a tight shaft but rather a choke plate that's jamming in the bore. The plates position in the shaft is adjustable. I suggest loosening the plate retaining screws and repositioning it slightly (likely a little lower when open) to cure it. Whatever works though...

Craig N. Coeur d'Alene ID.
66 Black Monza 4dr, 4.2L V8 49k
66 Red Monza 2dr 140/4 EFI 60k
61 Seamist Jade Rampside 140 PG
65 Cypress Green Monza 140/4 4dr
65 White 4-dr 110/AC/PG (parts)
64 GB -CrUnChEd (donor)


20 Tons of parts in boxes

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Re: Carb choke butterfly gets stuck closed
Posted by: Gregory_Miller ()
Date: July 15, 2011 08:35PM

+1 to Craig.

Greg Miller
Eugene, Oregon

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