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Thread: Mikuni Solex Carb Adjustment Screws and Procedure

  1. #1
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    Mikuni Solex Carb Adjustment Screws and Procedure

    Hi everyone! I think this is a Mikuni Solex Dual Port 28-32 DIDTA Carburetor. Another one is currently fitted on a 4G32 engine in a Mitsubishi Celeste.

    It has 5 adjustment screws. Can anyone help me to identify them?

    A: There is another screw exactly like this on the other side
    B:
    C: It screws at an angle
    D: I think this is for the throttle

    And does anyone know what screws to adjust first or what are the steps in adjusting? I can borrow a tach or a vacuum gauge from my mechanic's garage.

    Much thanks.

  2. #2
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  3. #3
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    The best way I find is to unscrew the four bolts mounting it to the inlet, then lifting with both hands, pull it from the car and put it in the bin.

    Then fix a weber to it

    Serously a horible carb, that solex thing.

    A's Primary pilot jet (these aren't adjustable), secondarys on the otherside.
    B's bypass scew.

    These two you fluff with...
    C's Idle mixture.
    D's a Throttle stop.

    Sorry I dont know any more than that, as I ripped mine out, if you really get stuck I can post a page out of a manual.

  4. #4
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    I can't afford a new carb right so I'm hoping to make do with this one. Can you please post the page of the manual. And do I just leave screws A and B screwed in all the way?

    Im having problems with carb backfires and a dead/flat spot when accelerating.

    Thanks for replying.

  5. #5
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    Mine did the same thing, thats why I replaced it, the fuel bowl used to run dry under hard acceleration.

    Make sure no ones fiddled with the floats as well.





    The 1600cc is the same as the 2000cc, just jettings different.

  6. #6
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    Thanks red

  7. #7
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    I'd guess that the pilot jet is like that of a 40 or 44Phh Mikuni and the way you adjust it is to install a larger or smaller one. The pilot screw adjusts the mixture at idle to about 15% throttle and then it influences the main circuit (it does not adjust it, but it still has an influence.) Not sure where the main air and fuel jets are on those. I'm a huge fan of the Mikuni 44pHH side drafts, they are awesome carbs, way better than Webers.

    Will

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