Remove the line from the carburetor that leads to the fuel tank. Check to see that fuel flows freely and constantly when you open the shut off valve at the tank..... making sure that the filter that's screwed into the fuel tank is not clogged.
Remove the carburetor... remove the drain screw/bolt from the float chamber. The high speed jet is located in the bottom center portion of the float chamber, way in back of that drain screw. Clean that jet carefully with a piece of single strand steel wire.
Remove and clean the brass nozzle from the center portion of the upper carburetor body (all its small holes).
Make sure that the float N/Valve is thoroughly clean and works freely.
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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.
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(Carburetor Adjustment - Single S/S Adjustable Needle Valve)
(J. Reeves)
Initial setting is: Slow speed = seat gently, then open 1-1/2 turns.
Start engine and set the rpms to where it just stays running. In segments of 1/8 turns, start to turn the S/S needle valve in. Wait a few seconds for the engine to respond. As you turn the valve in, the rpms will increase. Lower the rpms again to where the engine will just stay running.
Eventually you'll hit the point where the engine wants to die out or it will spit back (sounds like a mild backfire). At that point, back out the valve 1/4 turn. Within that 1/4 turn, you'll find the smoothest slow speed setting.
When you have finished the above adjustment, you will have no reason to move them again unless the carburetor fouls/gums up from sitting, in which case you would be required to remove, clean, and rebuild the carburetor anyway.
That should do it... If you reassembled and installed that carburetor.
