Welcome to KZr Cow_Man.
If you're planning on sticking with OEM parts and are going for a resto, be aware that the OEM petcock (51023-1023) for the '78~ KZ650 is no longer available.
In fact, the original part number has superceded 4 times (51023-1370, 51023-1011, 51023-1013, 51023-1005) over the years, and all of them now are no longer available.
When I replaced the petcock on my '78 KZ650-B2, I just checked what other current model Kaws used the same oval o-ring (51039-013) that mounts it to the tank, and then researched which petcock was still available.
The Kawi '05 KZ1000-P24 (last production year of the Police bike) just happens to use that same o-ring, and since it's newer than my '78, parts are still (for now) avaialble.
The petcock for the Police bike is a 51023-1375.
And aside from the obvious part number diff, the only things diff are the direction the fuel and vacuum fittings face coming off the back of it.
IIRC, when I bought that same petcock 3 years ago, it ran me around $85 +tax.
Of course you can always follow Kents suggestion in checking with Z1 Enterprises, which I believe is a less costly sollution. I've heard the Suzi petcock is comparable to the Kawi and a lot cheaper.
Post edited by: RetroRiceRocketRider, at: 2007/11/25 10:35