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Quick an easiest way to isolate the problem whether fuel or spark/compression is with starter fluid (or carb cleaner or flammable brake clean).
To use starter fluid, remove the air filter and set aside. Set throttle low/choke off. Spray a 1 second burst directly into the intake. Leave air filter off and promptly start.
If it fires and runs a few seconds and dies then likely no fuel delivered from carburetor. Remove spark plug, if dry them no fuel delivered from carburetor. Check operation of anti afterfire solenoid, water in carb fuel bowl, other.
If it does not run then either flooded, no spark, or low compression. Remove spark plug. If plug is wet then either too much fuel, no spark, or no compression.
When it won't start have you removed the spark plug after cranking it over like you were attempting to start it cold with the choke on and then inspecting the spark if it's wet then you know it is in fact getting fuel enough to start and you can proceed with the next test which is putting the spark plug back on the plug wire and grounding the spark plugs base against the motor so it can ground and crank the motor over like you again were trying to start it and seeing if your getting a good blue colored spark that is blinking fast and doesn't stop blinking/arching at the plugs electrode. ( shut the choke and throttle positions off and when you ground the spark plug do so away from the plug hole) This test is easier if you have someone turn the key for you so you can watch what the spark plug is doing while cranking it over for about 5 to 10 seconds. If erratic or no spark and assuming you've changed the spark plug or plugs then something is grounding the shut off side of the coil or coils or you have a coil problem.
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