The Carby Master developed these needles, which solve a lot of the problems
That being said, they sometimes still have the problem to a lesser degree. I bought a Pace Powertorque at the tip - new carby bits, new primer plate, new viton needle which was slightly sticking (amongst other issues with the machine)
Pay note to what Norm has said, as well as the notes in the Carby Master's ebay listing
https://www.ebay.com.au/itm/Metal-T...4?hash=item3d85932c36:g:3EEAAOSwa~FZjvEW
