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A good cleaning is what is needed.
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(Carburetor Float Setting)
(J. Reeves)
With the carburetor body held upside down, the float being viewed from the side, adjust the float so that the free end of the float (the end opposite the hinge pin) is ever so slightly higher (just ever so slightly off level) than the other end. And when viewed from the end, make sure it is not cocked.
Does the primer bulb go hard when you squeeze it , yes or no.---------------Cleaner in a can is no substitute for ----Taking them apart for visual internal inspection / cleaning !!
The thing with the jets, especially the high speed jet is that if they were completely clogged, the engine would not start/run... period!
The jets just get clogged, fouled, gummed... somewhat! Just enough so that the fouling actually results in a jet with a smaller passageway that restricts the flow of fuel to a smaller amount. When you open the throttle, the engine requires say (to pick a figure) 8% of fuel..... the clogging/restriction may be allowing only 3% to flow through... not enough to keep the engine running, and the engine hesitates,bogs down, or dies...BUT... regardless you could spray cleaner through them, hence the need to carefully clean them manually with a piece of single strand wire.