Posted by Steve@Advance on November 14, 2017 at 17:14:44 from (66.169.147.211):
In Reply to: Re: Governor adjustment posted by Txpoweranger on November 14, 2017 at 12:28:31:
If the idle mix adjust screw does nothing, good indication the idle circuit is not delivering fuel, which would cause it to be lean.
I'm sending a cut-away view of a typical updraft to help you find your way around.
A couple of things to check:
Open the carb back up, looking at the diagram, follow the idle circuit from the main well up to the upper housing. Notice the fuel must be drawn up through the small hole beside the venturi. Be sure the hole in the gasket is aligned with the holes in the casting, and the gasket is compressed between the 2 surfaces when the screws are tightened. Sometimes the top is warped in that area, and will need to be filed flat in order to seal.
Also look at the fit of the throttle plate. With the idle stop backed off, the plate should be centered in the housing bore. If not, carefully loosen the screws and center the plate. Note the 2 tiny holes in the side of the bore. That is the idle and mid range fuel ports. The throttle plate needs to be between the holes when closed.
Continue studying the idle circuit in the drawing. Be sure everything is clear and in place. This is a generic drawing, may be some differences, but the theory is the same.
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