Topic: easy and cheap replacement for older kawasaki petcocks (maybe cb750 too)

[scrapfink]

Today I confirmed that the petcock on my 76-79 kz750 twin is the same thread size as harley has been using since 1975. Finding a good petcock for the KZ was a bit of a nightmare, as the twins are not nearly as common as the fours, but once I found this out.. well.. I got one for $5 off an 89 electra-glide. I know a petcock made for an 80ci motor will easily keep up with my 750.

The thread size is 22mm (not sure of the pitch offhand), and I read that some folks were using sohc cb750 petcocks on their kawasaki twins, so this might fit the CB too.

I dont know if this is news to anyone else, but it sure was to me, and very welcome news at that for a budget build. I hope it does you guys some good!

[Terry in Australia]

Thanks for that mate, I'll check it out! Cheers, Terry.

[Alan F.]

A great catch, thanks for sharing.  Now we just need someone to make an adapter for the early style tanks.... hmmm, 22mm if you can come up with the thread pitch I might be able to make one.... I'm subscribed.

[scrapfink]

my caliper says the threaded part of the bung is 22mm wide, and the thread gauge from my tap and die set says the threads are 1mm, making it a 22x1mm bung. I don't have any dies that go up that big, so I cant run a die on it, but I did the next best thing, hope that helps!

[Alan F.]

I can't seem to wrap my head around what style connection the petcock has to the tank...without seeing it.  BikeBandit isn't much help either with their blurry diagram. http://www.bikebandit.com/houseofmotorcycles/1978-kawasaki-motorcycle-kz750-kz750b3-us-fuel-tank/o/m3964sch84275
Off to ebay to look for pics I guess, brb.

OH OK, its just male threads sticking out the bottom of the tank, understood.

[scrapfink]

roger that, male bung on the bottom of the tank, usually connected to a ruined petcock. Most used ones are equally ruined, I haven't seen much for NOS petcocks, and if you are going aftermarket.. why not get a much cheaper and easier to find one for a harley?

[Alan F.]

You got that right.  I doubt that the filter screen on those petcocks will fit the thru-hole on an early style CB750 tank though, I'll have to find some other before an adaptor materializes.