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  1. #1

    Carburetor Synchronize

    Has someone a Carburetor Synchronize at Brisbane Area I could borrow sometime?

  2. #2
    Senior Member QLD
    Join Date
    Oct 2014
    Location
    Keperra, Queensland
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    I have a Morgan Carbtune that you can borrow Christian, it's currently with John at the moment so once he's finished feel free. Just need to take care with the plastic nipples as they're a little on the fragile side.

    I've never balanced a four cylinder before though so I can't give you much in the way of tips for that, I'm used to the simple two cylinders on the wee beastie
    1984 Katana 7/11 - done at last!

    1982 GS450E - not quite stock

  3. #3
    You'll get a very close synchronisation by setting the carbs all the same by eye on the bench.


    Use a small (2mm) drill bit as a gauge or one of the tiny venturis in the engine-side spigot to get all the butterflys or slides opening and closing exactly together.

    I've never synched any of my bikes with vacuum gauges and they run fine.
    Of course a proper vacuum synch will get everything 'just' right and provide maximum power, but if you just want a pretty smooth-idling and running bike for street use, just set the carbs by eye and forget about them!

  4. #4
    Thanks, Pete when John is ready I'll have a try. No hurry, In the meantime I try "the eye on the bench".

  5. #5
    Senior Member QLD
    Join Date
    Oct 2014
    Location
    Keperra, Queensland
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    3,273
    A good bench sync will do well, but what I find on the wee beastie is that when they go out of sync, I get this weird little vibe at about 6K RPM that makes my nose itch... I kid you not... when I sync the carbs it goes away...
    1984 Katana 7/11 - done at last!

    1982 GS450E - not quite stock

  6. #6
    Senior Member QLD darkside's Avatar
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    Oct 2014
    Location
    Near Brendale
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    1,083
    Hopefully I should be done with the gauges this week.

    For bench sync I look at the 3 dump holes at the top, with butterfly fully closed you can just see the edge of one.
    Adjust each so you can just see the full hole.
    HKSI


    "But what would I know, I cant even diagnose a vacuum leak"

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