Quote:
Originally Posted by Marshall V. Daut
Oil all the places of movement on the accelerator linkage, especially the top two oil pathways. They may be gummed up and not allowing the linkage to return the carb's accelerator arm to "home". Perhaps the heat from the warmed up engine makes this worse. Oiling and working the linkage arm back and forth should help.
Also check the manual hand throttle arm for binding near the starter. When they gum up, they can affect the free movement of the main arm.
Marshall
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Dad had this trouble a while back, this solution worked like a charm.