I've always been able to clean slow Jets with Berrimen's Chem Dip and then compressed sir. I keep carb cleaner away from rubber parts, except for Yamalube carb cleaner, which is safe with any rubber. Regarding the sensitive tach, you're probably talking about doing an idle drop? I just go 2 1/2 turns out and then check the plugs for rich/lean evidence. Some kind of manometer is needed to sync the carbs after a bench sync, esp. if the bike "pops." I made one out of plastic tubing from Home Depot and some ATF. Check YouTube for instructions. Good luck.
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