Petcock sizes

Posted: Fri Nov 09, 2018 5:45 pm

So there is a 20mm thread size petcock and also another side correct? What is that size?

CB1100F Joined: Jun 18, 2006 Posts: 2523 Location: UK

There is also a 18 and 16mm Nathan

Here is a link to Genes petcock guide

http://www.cb750c.com/Genesound/Petcocks_79-83_DOHC.html

Posted: Fri Nov 09, 2018 9:38 pm

That's a great help to sort out what part numbers came on which bikes. I'm looking for thread sizes for all the different petcocks to see which one may be easily available. I need to make an aluminum weld in bung for the petcock. I'm hoping to either make or find one that's already made but I need to know the specifics of the threads.

CB1100F Joined: Jun 18, 2006 Posts: 2523 Location: UK

Nathan

When I got my replica 1100R alloy tank it had a 16mm bung with a Tap with a 6mm outlet on

It was also slighty out of position so i had a new M20 X 1mm pitch bung made and used a late CB900/1100F tap which you can get a repair kit for from a forum member

I made a couple of flats on the bung to reduce the size before welding

Keith

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Posted: Sat Nov 10, 2018 12:14 pm

Nice! Thanks Keith!