Re: 300u idle speed, tach parts.. buncha ?s

Posted by CNKS on January 20, 2007 at 11:29:20 from (204.249.178.32):

In Reply to: 300u idle speed, tach parts.. buncha ?s posted by JayWalt on January 20, 2007 at 10:46:25:

You should be able to turn the idle speed screw out until the engine dies, that is the screw just below and to the rear of the piece that attaches to the tube that runs to the governor. Turn it in or out for the desired rpm, then adjust the idle mixture screw -- the one that angles out of the throttle body below and slightly to the rear of the idle speed screw, in or out until it runs smoothly. The main jet screw (lower front of the carb bowl) is usually left 4 or 5 turns out from the seat for max power, it can be turned in for better economy, turn it in too far and the tractor will stumble under load. This adjustment is not done like on the H carbureter that preceded it, that is in until rough, out until smooth. If your carb is clean with no defective parts, and this procedure does not work, then you could have governor problems, that is another story. I don't know the dwell reading but it is not necessary to check the dwell on that distributer, just set the points at 0.020 on the high side of the cam and you are there. If you do have problems with the distributer cam, you have to fix that or it will never run right.

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