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Slow running problems... - Printable Version +- Austinsevenfriends (https://www.austinsevenfriends.co.uk/forum) +-- Forum: Austin Seven Friends Forum (https://www.austinsevenfriends.co.uk/forum/forumdisplay.php?fid=1) +--- Forum: Forum chat... (https://www.austinsevenfriends.co.uk/forum/forumdisplay.php?fid=14) +--- Thread: Slow running problems... (/showthread.php?tid=7016) |
Slow running problems... - Colin Bromley - 29-12-2021 My Chummy is playing up, this time last year it became very hard to start, so I had the carb, mag and bacon slicer rebuilt. It seemed ok after this and certainly went a lot better, but I never seem to have been able to set the slow running up properly, it refuses to tick over, with the hand throttle set it will run fine, but when one reduces the revs, aiming for something close to tick over it dies. I assume that I have got something wrong in the carb setup, I have looked in Woodrow & the green book, but nether offers any advice on how one should set the slow running up. Could someone offer advice? It has a bronze up draft Zenith... RE: Slow running problems... - Mike Costigan - 29-12-2021 Air leak, float level, dirt in the carb? Is the slow-running tube split? RE: Slow running problems... - Colin Bromley - 29-12-2021 I have sprayed all the joints with brake cleaner with the engine running, and there is no increase in the rpm, so I assume no air leaks, earlier this evening I took the carb to bits, it was all clean inside and there was no obvious damage to anyhting... RE: Slow running problems... - Mike Costigan - 29-12-2021 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! ![]() RE: Slow running problems... - Ruairidh Dunford - 29-12-2021 I have increased the compensating jet size on a number of cars recently to obtain decent tick over, I suspect modern fuel may be the issue. RE: Slow running problems... - Dave Mann - 30-12-2021 With the 22FZ & 22 FZB carburetors I have found that a lot of the slow running screws are splayed out and split where they touch the slow running jet by being screwed down tight, replacements are available from Willie Mackenzie. ![]() |