Waterpump gears

I'm going to rebuild a kz1300 which I bought 6 months ago. I've been sourcing parts ready to start.
my question is it worth replacing the water pump gears. and what with. Are there originals or copies still
to be purchased ? and what about the cam chain tensioner or course I've read about ..I think its a Z1100
thanks in advance

Welcome.
I hope you might be able to show some photos of your bike, and the rebuild as it progresses.
What is your story - what is the appeal of the 1300 for you?
Regarding the cam chain tensioner, this subject has been discussed many times on the forum. If you do a search, you’ll find lots of information and differing opinions on how to improve on the original tensioner. The three options seem to be : modify the original tensioner ; fit a ZX11 / ZZR1100 tensioner, after shortening the spring ( much debate on that! ). ; or fit a manual tensioner.
Not sure about the water pump gears. Maybe somebody will advise.