How to tune the carburetor honda 750 nighthawk

Syncing 750 Nighthawk carburetors

  • Hello everyone,

    i have a problem with a friend's motorcycle. Unfortunately I don't know what year the machine was built.
    But it's about the following: the manual says that carburetor 2 is the "fixed one". If I now compare the 1st to the 2nd, the value of the 2nd also changes.
    I therefore claim that 1 + 2 is a pair that you set in the opposite direction with the screw, 3 + 4 then the other pair.
    Since I am not at all familiar with Honda, I now disagree with the manual (the machine is an American import with a mileage speedometer, etc.)
    Does anyone know if there were different carburetors?

    Thanks for the help!

  • Hello everyone,

    But it's about the following: the manual says that carburetor 2 is the "fixed one". If I now compare the 1st to the 2nd, the value of the 2nd also changes.

    The Mother carburetor value changes through the Change in speed,
    which comes about by adapting the 1st carburetor to this.

    The mother carburetor will not "opposite" adjusted too !!!
    It is how you write correctly not synchronizable.
    But: He is the one Base; it is synchronized to this (!)

    After that Carburetor 3 on the Mother carburetor vote and then only carburettor 4 (outside right)
    synchronize with the mother carburetor (!)
    Since carburetor 4 is only properly synchronized when 3 is behind no more
    is changed
    (!).

    _______________________________________________
    Anyone who rides a naked bike does not only find out how fast they are really going via the speedometer needle, with the vehicle ...

  • Contributions
    726
    motorcycle
    CBX1000 `79 Cb125X` 80 CB750 `92 CB500X` 21
    place of residence
    Horb
    Interests
    Motorbike + travel

    That's how it is.
    Carburetor 2 is operated directly from the throttle cable (reference carburetor, mother carburetor ...).
    Carburetor 1 is dragged along on the left via an adjustable, spring-loaded driver, carburetor 3 is also dragged along on the right using an adjustable driver. Carburetor 4, in turn, is attached to carburetor 3, also coupled via an adjustable driver.
    Synchronizing is nothing else than adjusting the throttle valve positions by adjusting these drivers (spring-loaded screws) and thus achieving the same vacuum ratios and thus the same cylinder fillings.
    greeting


  • Synchronizing is nothing more than adjusting these drivers (spring-loaded screws) to adjust the throttle valve positions and thus to achieve the same vacuum ratios and thus the same fillings of the cylinders ...

    Blue:

    Very well explained!
    My formulations read somehow "incomprehensible"! : o: o

    _______________________________________________
    Anyone who rides a naked bike does not only find out how fast they are really going via the speedometer needle, with the vehicle ...

  • Thank you, that was explained very well BY EVERYONE.

    The only thing that really puzzled me was the fact that this linkage looks exactly like a carburetor that has two pairs. So I wanted to be sure again.

    So thank you and happy Pentecost!

  • bluemeanie

    great explained
    you just learn , also helped me.

    greetings bernd