Here's another one of the carb-area. Having had a closer look, it's clear that these carbs have been painted black at some time. I spoke to Oz at "Zed-Parts.com" and he assures me that his ultrasonic-cleaning service will strip off all the shite from the carbs, back to the base alloy. He will also be overhauling the carbs with Keyster Carb-Repair kits. Shipping the carbs off to him on 14th October, so I'll let you know what they're like when they come back.