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How thoroughly did you clean the carb? They need to be fully disassembled. There are some small orifices in them that need to be cleaned with either a jet cleaning tool or a piece of wire.
when was this vehicle as serviced? this could one of several issues.
1 the idle jet on the carborator maybe dirty so the engine is not getting enough fuel at tickover to keep running. 2 the fuel filter is blocking up and may need replacment. 3. the carborator may need an overhaul as the float chamber is not activating correctly. 4. fuel cap may be blocked give a run with the fuel cap off see if that helps. if you get aload hiss each time you fill up that indiates a blocked fuel cap which will need clearing or replacing. 5. dirt in the fuel line if filled from jerry cans contaminents can get in th tank and block the line. when you put pressure on the gas this causes higher vacum from the pump and hides the problem. 6 airfilter may be blocking and needs replacement so there is not enough air at ldle. 7 check plugs if they are sooty or covered in white then the mix is wrong and needs resetting. or indicats reduced fuel or air to engine. 8. plugs may need replacement.
Sounds like the carburetor is dirty and needs cleaned. I would suggest trying some fuel line cleaner such as gumout or seafoam in the fuel tank and start and run it a few times to circulate the cleaner, then let it set overnight. May have to start over several times to get it to work. It will eventually start running, tho not real good, until the cleaner gets in there.
This is probably, a timing problem. check the plug, and the magneto. Also, if you haven't already, make sure the air and fuel filters are in good order. Have fun.
Check to see if fuel is leaving the tank, the internal screen might be plugged up. Check the rubber fuel lines and if provided the in line fuel filter for flow. Don't always trust carb cleaners and compressed air to clean a carb., you might have to use a steel wire from a wire brush to open the jets and passages.
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