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Too much secondary pull-off?

Discussion in 'The Venerable Q-Jet' started by Shrav, May 1, 2005.

  1. Shrav

    Shrav Well-Known Member

    Hi all
    Here is where I am at. I rebuilt my carb wayyyy back in January and only installed it a few weeks ago. I put on a new secondary pull off and choke pull off in the process. Today I actually got a chance to do a quick take off and it opened up fine but kind of died at about 60-70. I never heard the secondaries kick in. At home I popped the breather off and tried to watch the pull offs when I worked the throttle. The choke pull off would release when I revved the engine (and vacume dropped) but the secondary pull off didn't move. If I removed the short vacume line to it the secondarys opened when reved. I see it takes about 2 seconds or so after removing the vacume line for the pull off to let go. Is this too long? I realise the pull off is there to stop bogging on a hard acceleration but I'm wondering if it even releasing the secondarys at all. I guess my question is should I be able to manually rev the engine and see the secondarys open or do I have to really hold it open (for several seconds to see the pull off release? Is there that that much of a difference in response time between the choke pull off and the secondarys pull off response time? TIA
     
    Shrav, May 1, 2005
    #1
  2. Nicholas Sloop

    Nicholas Sloop '08 GS Nats BSA runner up

    Two seconds for the pull-off to release is about right. You can speed it up by openning the tiny hole in the vacuum nipple with a tiny drill bit, but, too much and it will bog, and there is no going back except with a new vacuum break.
    You would have to really rev it in neutral to get the secondary air valves to open. It won't happen until the vacuum is discharged from the pull-off.
    The vacuum break at the back should have no effect on secondary operation, I don't think... I believe it just speeds up getting the choke open for lower emissions.
     
    Nicholas Sloop, May 2, 2005
    #2
  3. Shrav

    Shrav Well-Known Member

    As always I appreciate the replies. And on a side note I figured out why the choke pulloff was not working. It seems that when I rebuilt the carb and changed it the vacume hose I grabbed from my tool box had a bearing stuck in it. DOH! :error:
     
    Shrav, May 5, 2005
    #3

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