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I would try using some solvent to clean the carb. It sounds like the float valve is not moving freely, therefore not letting enough fuel into the carb. Be careful though, solvent can be a bit rough on the engine, so be sure to drain it out of the fuel bowl and replace with the appropriate fuel before starting the engine.
A bad duckbill vent (the little green thing) inside the fuel cap will cause a vacuum to be created if it is NOT venting to the atmosphere. Odd that all new ones you have used are bad. Maybe try using your old, original fuel cap and the carburetor needs adjusting or at the least; a gaket and diaphragm kit installed. Carb screws are NOT user friendly, thanks to EPA and CARB emissions regulations. You can get onto the heads of them to turn them by tapping a 22 gauge automotive-type plastic wire connector onto the head, and that will give you enough grip to turn them. I would TRY adjusting the carb before getting a kit, but after 2 years or so, a G & D kit is usually needed due to the internals of the carb drying out. If you adjust the carb, this is how the manufacturer says to:
I would recommend replacing the fuel filter and spark plug. If this is a 2-cycle engine be sure you are using fresh gas with the proper oil mixture. If your engine has a fuel primer bulb be sure to push it several times until you feel resistance before starting and make sure there are no fuel leaks. Failing that you may need to adjust the carb fuel mixture screws after the engine runs long enough to warm up (1-2 minutes). Check your owners manual for other troubleshooting procedures. Good luck.
clean spark plug and gap, remove air filter and clean, look at the spark plug and tell us what color it is, You may need to adjust the fuel mis to get it to run right or you may need a gas filter. Post here with more information.
for any motorcycle to run you need three things. spark, fuel and compression. i see you've tried to get fuel and spark. if you have spark thats one down. dont pour fuel into cylinder. instead spray tiny bit of brakeclean or carb clean into spark plug hole. i have a feeling if you drained your gas after the carb clean the carb most likely sucked bad gas back up and might need cleaned again. ive seen it happen alot on ols bikes.
Dump the fuel in the tank, get new gas and new oil and start over. Get a carbeurator cleaner additive for the gas as your carb. is dirty resulting in the sporatic operation.
A spray carb. cleaner that you squirt into the air intake by removing the air filter will also work for you. In fact, when you are getting the carb. cleaner get a new air cleaner and a new spark plug. get back and let me know how u make out.