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My MGB SU hs4 carbs has sticky( not moving) choke rod

Choke plate not moving. Oiled cable and rod linkage (where the rod goes into the carb body)for the choke. Still not moving. I'm ready for a test run. Car's been sitting for a couple of years. Tarnished gas sticking? Can I free this up without removing carbs? Tried tapping lighly, nothing, HELP Thank you.

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  • johnny johnson Nov 10, 2013

    Rebuilt and cleaned carb, new o-ring on choke enrichment cyclinder. Probelm solved.

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  • Cars & Trucks Master
  • 3,799 Answers

To clean an SU carb you will need to remove it. Sorry.

Posted on Jul 09, 2013

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 91 Answers

SOURCE: Suspected problem with choke.

hey apparently and did are two different stories draining the float bowls and cleaning the carbs are two different things the fact that the choke dosent change suggest the carbs are stopped up after sitting for 1 year clean the carbs let them soak in carb cleaner and blow them out with high pressure air, keep notes of the adjustments befor you dissasemble them (air screws)

Posted on Jan 11, 2009

  • 3567 Answers

SOURCE: Won't idle without choke

The pilot jet controls the air/gas fuel mix at idle . If the jet gets plugged up not enough gas gets to the emgine at idle. You will need to remove the carbs and float bowls and clean them, paying special attention to the pilot valve. Count the number of turns to remove the pilot screw and replace the same number of turns then turn counter clockwise 1/2 turn.

A “very helpful” rating for this answer? Thanks!

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Posted on Jun 30, 2009

ollie reece
  • 1167 Answers

SOURCE: bike idles on choke , engine dies on acceleration drz 400 e 2003

try using that redex stuff get back to me

Posted on Sep 25, 2009

robotek
  • 1512 Answers

SOURCE: 350 raptor only runs with full choke on ,

Hi Mike,
You will find that there is a problem with the carbie. It runs with the choke on because the choke engages the "enricher" circuit. The idle circuit is different a different circuit inside the carb. When just crack the throttle on, you use the pilot circuit, and then main jet with more twist of the grip. You will need to completely strip the carb, remove all jets, spray carbie cleaner throughout, and blow out all capillary tubes and holes inside the carb with compressed air. Pay particular attention to the fine holes inside the venturi near the butterfly valve. You may need to use a fine piece of wire, like a guitar string to open up any that are clogged.
There is not much else that will cause the symptoms you have. Check for air leaks about the inlet manifold also, spray some carbie cleaner about the manifold connections boots, the revs will change when it sucks up the cleaner through the leak.
Happy to talk to you more about it.
regards robotek

Posted on Jan 24, 2010

wd4ity
  • 4565 Answers

SOURCE: 1450 carb will not idle without choke on. cuts

If the bike has been allowed to sit for a while, the fuel may have evaporated in the float bowl. When this happens, the jets get stopped up with the gummy residue that is left behind. You may need to go through the carb and clean the slow jet and the main jet. While you're there, it would be advisable to install a new set of intake gaskets.

Posted on Feb 15, 2010

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I have a picture on my computer at home. Let me know by way of COMMENT under my post if you want to see it.

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