After verifying A GOOD spark (FAT AND BLUISH-WHITE, THE COLOR OF LIGHTNING) then suspect the carb.
The secret to a good carb rebuild is a thorugh cleanng i.e a complete disassembly and a minimum of a 24 hr soak in carb cleaner. Blow out all the passages with compressed air and them probe them to make sure every bit of crud is out and then blow it out again with compressed air.
If you"ve done that all ready during your rebuildand you are sure the carb is really really clean, and you are still having problem with an overly lean mixture, look for air leaks around the carb metering section. The usual culprits are a worn throttle shaft, missing throttle shaft seals, a leaky gasket between the manifold and the carb, cracked or rust holes in the manifold or a leaky manifold to cylinder head gasket. Get some starting fluidand with the engie idling, CAREFULLY (don"t spray it on a hot manifold!) spray it around the spots I mentioned above and if you hear the engine speed up, you"ve found your air leak.
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