The only questions which are stupid are those not asked. At idle engine vacume created by the downward movement of the piston in a sound engine creates a vacume which sucks air in through the venturi creating a negative pressure which sucks up fuel through the pilot jet then into the cylinder to be burned. Now if any fuel orifice is plugged including jet, fuel will not be delivered into the cylinder. Also if compression is not adequate due to worn rings or leaking valves sufficient negative pressure will not pull fuel from the bowl. This is why I stated earlier you must have basic functions which are compression, fuel, air and spark at the correct moment. If any one of those are missing the engine will not run. A finger in the plug hole will tell you nothing, you need to know how much compression you have. A perfectly sound GY6 will have 155 to 160 psi. They will run on 120psi but are usually very hard to get started and will not have much power.You can beat your head against a wall and still not find your problem. You need the tools to do the job. When you go to the doctor he has tools for checking vitals. Blood pressure machine and thermometer, scale. Basic tools. Your engine is not much different. If you don't have adequate compression you can replace plugs, carbs whatever but until you fix the problem it will not run at all or run right. Get a compression gauge and check the compression. Read the instructions that come with it and it will tell you where your loss is if so. Once you know the compression then you can go from there.
TOM
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