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If your engine has adjustable jets they will be accessible on the outside of the carb, and can be accessed without removing the carb as you will use them to tune the engine while it is running.
Most of the time it's because the Pilot/Idle jet is clogged in the carburetor. This most often happens because of old fuel sitting in the carburetor during long periods of sitting and non-use. The fuel forms a varnish - a gummy layer inside of your carburetor and clogs the tiny holes in the idle jet. Since fuel can't get through, the engine dies. The hole for the choke is larger, therefore the fuel can still get through it.
a lot of people that take these apart put them back together backwards. make sure it is right. most of those carbs are not adjustable other than the jet itself. make sure your fuel tank is clean and fuel lines are clear/ fuel filters are clear or new.
1. How could you tell it wasn't getting enough fuel in the "power band?"..i.e. the upper rpm range...?
A "power band" is simply the RPM range where the engine makes the most power.. it is more pronounced on modified two-cycle engines.. it is NOT something you can buy or have "installed".
Adjusting the float level only accomplishes getting more (or less) fuel in the carb bowls to make it available to the jets. >>The JETS are what (and ONLY what) gets the fuel to the engine!<< Spark plugs are read to tell whether their is a need for a jetting change.. if you do not know how to do this - STOP tinkering with your engine-PERIOD!
You need a factory shop manual to get the necessary specifications of the ignition system,,(resistance values)...then and only then can you adequately check the wiring and related components...
What is a hot rod crank? I have built numerous banshee racing engines.. just wondering about yours.. $3000 in an engine.. it should have come with 34mm carbs, new head, ported cylinders, etc...jetted by the person that built the engine... if it didn't you need a new engine builder!!!
Do you live near North Alabama??