Check the spark plug after a failed attempt to start. If dry, then no fuel is entering engine. Did you leave old fuel in carb? if so, your carb probably is dirty: old gasoline deposits varnish, gum, and you will need to dissassemble carb and clean it.
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I assume that the spark plug are good and the gas line is clear. Try to adjust the gas line supply and default engine startup revolution settings try it full half and minimum back and forth it works. Other gen sets requires a mix of oil with its gas, please do it when it is required with exact proportion. Hope this helps. Goodluck.
Make sure it has plenty of oil. Some engines have a low oil shut off. Pull the spark plug wire off and stick a screw driver down inside the spark plug boot and hold the screw driver about a 1/4 inch away from the top of the spark plug and turn the engine over to see if you have a good bluish spark. If you don't then you have a bad coil or rust build up on the flywheel. If you have spark make sure your gas tank is full with new gas. Make sure the air filter is clean. If that doesn't work try taking the bowl off of the bottom of the carburetor and verify gas flows through the float valve. If that doesn't work then you will probably have to remove the carburetor and clean it out.
1. Fuel selector: ON
2. Start run sw: ON
3. Oil Level : Full
4. Choke selector FULL ON for no more than 2 pulls initially The half choke then off
5. Spark at the Spark Plug YES? NO?
a. No spark suspect low oil level sensor is grounding the ignition either due to low oil level or it just is not working properly.
After doing all of the above...
Spark Plug WET or DRY? Dry and still won't start check fuel supply. If you use the choke with the start run switch in the off position the spark plug should get WET. Spark plug does not get wet... with choke on and ignition off. Fuel supply problem.
At this point I suspect either the Oil Level is incorrect or... that the FUEL SELECTOR is OFF.
If you need more help just respond here and we can press on.
fuel, fire, mechanical. Miss one and she won;t run. Are you sure the gas was good? Not some old can laying around that may have turned or become water contaminated? If it was fresh gas, then take off the air cleaner and spray a little wd-40, or ether, or brake cleaner whatever is flammable into the carb throat. Just a 1 second shot is all it should need. Try and start with that. If it starts and then dies quickly, still a fuel problem. maybe a gasket is damaged, or the jet is clogged. When you said you checked for fire, you acutally took the plug out and had it grounded while spinning the motor and saw spark? If you saw a hot spark then you have eliminated fire. Mechanical not likely if it was running well a short time before. If a valve was damaged, it would still run but not too well. My gut feeling is it is related to fuel.
sounds like the float is stuck, how long has it ben setting around? try some carburetor cleaner. spray the carburetor down. empty the fuel tank put fresh fuel with fuel treatment. you may have to remove the spark plug, pull starter string a couple of times to clear out cylinder make sure spark plug is dry put back in and try to start the generator.
With your model number I could see if it has a low oil safety switch I have seen them go bad (check your oil level )
With all wires un plugged from the coil you should have spark
if not coil is bad .
Use another spark plug to test for spark, ground the side of the plug by holding it against some-ting metal on the engine , spark
plug wire hooked to the plug. leave a spark plug in the cylinder
head so gas wont fly out and hit the test spark plug catching fire (seen it done).