Chris, Ok that makes sense, you will be loosing valuable vacuum needed to draw fuel for the idle cct. Also I had forgotten that your carbs have a vacuum port for ignition timing advance. I will take a stab and make a guess that these vacumm ports [for the ignition timing] account for why the idle jet size for the left and right carb barrels differ. If you plug the vacuum ports on the carb, i would be inclined to then fit matching idle jet sizes for each barrel.
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I've just realised that the vacuum ports on the carbs (to provide vacuum for the timing advance) have been left open, I've got a feeling these affect the engine more than I had imagined.
Yes you are correct. the idle jet [IMO] has the largest influence on your tune, especially on a street as most of your driving will be in the idle and progresssion ccts. In terms of percentage, your engine will rarely see WOT [main cct].
cheers
benny
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