Topic: CB750 77-78 K and F PD Carburettors

[Vin750]

Hi all, I am wondering here if there is any physical difference between the following carburettors:

K7 - PD41A
F2 - PD41B
F3 - PD42A
K8 - PD42B?

It looks to me the last three have the same body but the K7 one appears different. It had a different float height too.

Do they use the same gaskets?

Thanks in advance!

[flybox1]

Same gaskets.
the 41's have adjustable needle clip positions.
The 42's have fixed needle clips.

[Vin750]

Same gaskets.
the 41's have adjustable needle clip positions.
The 42's have fixed needle clips.

But isn't the 41A smaller? Why does it have a different float height?


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[flybox1]

I cant say if they are smaller.  Never measured either of mine.  I have 41a's and 42b's.  Just interchanged a few parts when needed, and always clear tube checked/adjusted the floats.

[Vin750]

I cant say if they are smaller.  Never measured either of mine.  I have 41a's and 42b's.  Just interchanged a few parts when needed, and always clear tube checked/adjusted the floats.

If you ever have the opportunity to measure them, it would be much appreciated.

There has to be some difference, the float height would be 12.5mm otherwise.