Buoymaker has mentioned one of the "gotcha's" I mention in my blog on the Carter type W-1 carb.
When rebuilding, one should ALWAYS check for wear on the bracket/arm that is affixed to the back side of the throttle shaft, and the rod from this arm that operates the metering rod/accelerator pump. The hole in the bracket arm should be round but wears oblong. The round rod which is inserted into the round hole will over time wear a groove.
Both parts are readily available (although there are different parts for different carburetors) for all W-1's.
Jon
