Re: w-4 carburetor adjustment

Posted by Bob M on April 12, 2006 at 06:47:32 from (151.190.254.108):

In Reply to: w-4 carburetor adjustment posted by jcarter on April 12, 2006 at 06:00:52:

Most likely a plugged carb passage or the high speed mixture is set WAY too lean. However other possibilities are the float level is set to low or there is a restriction in between the fuel tank and the carb inlet (plugged screens in the sediment bulb or carb inlet)

It's probably NOT a bad manifold gasket leaking air - if it was the problem would be worst at low idle.

Suggest cleaning out the screens, then dropping the float bowl (lower half of the carburetor) and thoroughly cleaning the passages/orifices again. Be looking for a gob of rust, piece of gasket, etc caught in a passage at the bottom of the bowl or in the main discharge jet. Poke through each passage with a piece of stiff wire or similar. But be careful not to scratch or otherwise enlarge any of the orifices!

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My experience is high speed mixture settings vary widely from tractor to tractor. They seem to vary anywhere from about 1-1/2 to about 5 turns open.

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