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ez-just mixture screw will not screw all the way in

Discussion in 'EZ-Just Idle Mixture Screw' started by thedeuce, Sep 2, 2013.

  1. thedeuce

    thedeuce Member

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    i took out the old mixture screw(which will go all the way up and protrude out of the hole) and installed the new ez-just and it will only go up half way. i really have to torque on it with a screw driver and i still can't get it all the way through. it seems to me that the screw is too big. help please
    thedeuce, Sep 2, 2013
    #1
  3. kenfuzed

    kenfuzed Administrator Staff Member

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    Unfortunately the factory (Keihin) has a very poor/broad tolerance on the threads tapped in these carburetors. Some may even have warped threads and since the EZ-Just is longer it may tighten across the length of the threads. Also common in these carbs is a carbon build up in the lower inside threads. The thread pitch on the EZ-Just is designed to fit in the majority of carburetors despite all the thread variations on the Keihin, but on rare occasions they may feel overly tight. I recommend cleaning the tapped threads with some carburetor cleaner first. Be sure to remove the packing (o-ring, washer, spring) before cleaning. Now with some light machine oil (3-in-1, Liquid Wrench) apply some to the EZ-Just and work it back and forth in the threaded hole. Clean and reapply a few times and you will probably remove quite a bit of carbon. It may take a few rounds of working the screw back and forth but it beats trying to find a metric tap to clean the threads out.
    kenfuzed, Sep 2, 2013
    #2
  4. hotroadking

    hotroadking Super Moderator Staff Member

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    don't force it and don't over tighten...
    hotroadking, Sep 2, 2013
    #3

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