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This appears to be a good source except for the definition/explanation for the warm up regulator.
"15.1.10 The Warm-up-Regulator
This simple device is responsible for controlling the amount of fuel delivered to the engine during it's warm-up period. The pressure acting upon the top of the control plunger varies depending on the engine temperature and provides an effective method of enrichment."
The first sentence leads some readers to believe it only functions during warm up which is incorrect. The official name of the WUR is "control pressure regulator" which performs a vital function in both cold and warm operations. A better definition is that the wur/control pressure regulator is a devise that provides counter pressure to the system pressure in the fuel distributor. During cold operations, control pressure is reduced to allow a richer mixture. As the engine temperature rises, the control pressure is increased to lean the mixture.
This isn't the first article I've seen with this omission.
Off my soap box now.
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Dennis
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