My 84 Nighthawk carbs are clean and ready to go with the exception of the floats. Each float is measuring low and I'm attributing that to the age..about 40 years. A little sag is not unexpected after all this time. I've double checked my measurements and they are all, indeed, low. So I'm biting the bullet and buying 4 new Honda OEM floats...for ...gulp...$224 USD (195 GBP, 228 EUR).
I just keep telling myself that carb float heights are critical to proper operation of a bike...and it's money...well...spent...ouch...