29-12-2021, 10:38 PM
(This post was last modified: 29-12-2021, 10:39 PM by Mike Costigan.)
Dave Mann will probably be along soon with chapter and verse, but I would start with the slow-running tube: slacken the nut on the top of the tube assembly (under the adjusting knob), then slacken-off the retaining grub-screw and withdraw the complete assembly. Separate the two halves and inspect the top half for cracks where it sits over the bottom half. If all is well, assemble the two halves so that they are just hand-tight together, then slacken off half a turn and re-assemble the carb ensuring the top nut is still loose. Start the engine and adjust the top half to get the best tick-over, tighten the top nut and the grub screw. If that doesn't solve the problem, then I would suspect the float height, but I'm not the one to advise on that!
Zenith FZ.jpg (Size: 56.24 KB / Downloads: 199)
Zenith FZ.jpg (Size: 56.24 KB / Downloads: 199)