Re: Fuel bowl restricts gas on 9n

Posted by Steve@Advance on April 14, 2019 at 12:05:00 from (66.169.147.211):

In Reply to: Fuel bowl restricts gas on 9n posted by badfish7 on April 14, 2019 at 08:49:24:

Don't worry about air in the bowl. It will come out when there is a fuel demand.

Weak spark can also cause the symptoms you describe. Check for a blue hot spark at each plug. Each wire should be making at least a 1/4" spark to ground at the plug end of the wire. Check the point gap and condition.

To check fuel availability to the carb, with the engine off, fuel valve open to normal run position, and plenty of fuel in the tank, get a clean glass container, remove the drain plug from the carb bowl, and catch the flow in the glass. It should have a full flow at first, then slow as the bowl empties, but it should still flow a stream, not slow to a drip or stop flowing.

Look at what was caught, if it's cloudy, that's water. If chunks of rust or dirt, it needs to come off and be rinsed out. Whatever is in the glass will also be in the carb. Once the tank is clean, the carb may need to be opened up and cleaned out. That can usually be done without a kit if careful with the gasket.

If there is little flow through the carb, start checking back to the tank for a restriction. There may be a screen in the fuel fitting at the carb.

Once the spark is right, the fuel is supplied and clean, the carb is clean, air cleaner serviced (including the wire mesh), it may be necessary to set the high speed jet.

To do so, get the engine up to operating temp, adjust the idle speed down to 400-500 RPM. Adjust the idle mixture screw (the small screw up top) for the best idle, then slightly rich.

Then adjust the main jet screw. To do so, idle the engine down, then suddenly open the throttle, listen for the response. If it hesitates, back the main screw out 1/2 turn, repeat the test. Keep repeating until the engine will take sudden throttle without hesitation. Continuous black smoke indicates too rich, turn it in some. The final goal is to have instant throttle response without hesitation, and just a single puff of black smoke.

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