>>I was under the impr
>>I was under the impression that the mixture could be "adjust" at the fuel distributor (WSM page D-53). It states that turning a spanner right while enrichen the mixture while left will lean it.<<
Stephen,
the adjustment you refer to only sets idle mixture. It raises or lowers slightly the FD plate/piston manualy, which in turn gives a little more or a little less fuel at idle only, afyer the engine comes off idle, the mixture is controled by system pressure and relative position of the FD plate, if pressure is to high, the plate is hindered in it's travel and the engine runs lean, if the pressure is to low, there is inadequate pressure on the plate, it travels too far and the engine runs rich. Of course there are other factors, but just wanted to give a simplistic overview of operation principal.
Leaving an engine running rich is very hard on the rings, cylnder walls, valves, guides and oil. So it's not really a good thing or something that should be ignored as the long term effects can be expensive.
Regards, JRV
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