We're and what size oring

I ha e 1980 kz750 h1 their caps that go on my cv32 carbs what size oring do that take

What it looks like and we're it goes

Z1enterprises.com sell Keihin O rings. A few months ago I needed O rings for those pilot jet plugs and had to measure the groove and old o rings with a digital caliper. I found and ordered 4 each of 3 different sizes on the z1 site. One size fit but a bit to tight but I was able to file down with an Emory board to fit. Sorry but I can't remember the size. You could try emailing or phoning Z1. Search their website.

K thanks I think gonna try ace as well... I measured hole size 5.5 to 5.6 mm

Oh for future I found rubber plugs for a later kawasaki bike worked excellent called passageway blockers