Me from Wales again....

Diaphragms changed and running well... Found leak at throttle spindle into butterflies... Can I get new seals to sort this... Much appreciate you guys and all the help I've received, bike is 1981 kz440

Hi Badger, glad to hear your bike is running well. The butterfly shaft isn't perfectly liquid/air tight If the bike is running well, what makes you believe there is a defect?
Do you have the stock airbox? If yes my suggestion would be to get the bike warmed up and shoot a couple short bursts of starting fluid at the shaft bushings and see if the rpms increase appreciably. If no I think you are fine. If you have pods on it it will be difficult to shoot starting fluid in the area without some of it reaching the pods and invalidating the test.