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More for Less Racer
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Yeah, idle air bleed sizes are very lean, especially the secondary side.
Matches up with the fact you've got to have the idle mixture screws cranked way out trying to get it rich enough.

The main jet size won't matter for the idle circuit problem.
2 jet sizes smaller is a standard tuning jump for testing, so it's fine for right now until you get to WOT testing .

I would leave the idle fuel restrictions as-is, change the air bleeds to what the spec sheet says they should be, put the pump shooter back to stock #31, and give it another test.
 

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More for Less Racer
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20,637 Posts
Does it run well at cruise and WOT with the new bleed combination? And just idle too fast?

High idle speed is air getting in somehow.

With the carb off, have you visually verified the primary throttle blades will close tight in their bores when the speed screw is turned out off the stop??
Make note of the rear throttle shaft setting for future reference.
Both shafts should be capable of being shut tight with their stops removed.

Have you tried closing down the secondary throttle blades some??
 
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