KZ650 C3 1978 : Petrol Tap Diaphragm

Does anyone know if the diaphragm from another model of Z will fit the one
on my 650? I'm having great difficulty finding the right ones from suppliers
and may have to resort to replacing the entire tap fitting. A cost i'd
rather avoid.

 

(I used to own a '77 KZ650B1 with a manual tap and an '81 KZ750E2
with the vacuum style tap, so I feel compelled to respond)

Since Kawasaki aren't known for using different part numbers for
the same part, I don't think using a diaphragm from another (K)Z
will work[1].

http://www.buykawasaki.com shows the 1979 KZ650C3 vacuum operated
petcock diaphragm as:

23 43028-1004 DIAPHRAGM ASSY,TAP 1 NO LONGER AVAILABLE
23 43028-1015 DIAPHRAGM ASSY,TAP 1 USE FOR 51023-1023

There are two find #23s listed, presumably because the -1004 part was
superseded. 51023-1023 is the vacuum style tap. If you cannot find
the diaphragm as a separate part, to save money you could substitute
the manual petcock from a C1 (I am assuming the non-vacuum type will
be cheaper):

10 51023-057 COCK ASSY,FUEL 1 KZ650-C1

[1] The '81 KZ750E2's vacuum tap (51023-1029) also uses the same
diaphragm as the KZ650C3, 43028-1015, FWIW.

 

Thanks for that Mark...and I hope you're right as I've managed to find a
supplier in the US who can supply a petcock (i remember pet rocks from the
70's, these must be a distant cousin) repair kit for a KZ750E2 which I've
now ordered. I couldn't find the Z650 C3 on the kwacker site, and the parts
details for the KZ750E2 don't have diagram details. Born lucky me. So im
crossing fingers and toes in readiness for the postmans delivery. Either
way, i appreciate your advice and thanks again. By the way, if anyone needs
my US contact address, let me know. Supply + p&p worked out cheaper than
buying locally. How good is that.