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Joe..... .....you've gotter right. Your sidepointing idlemix only is effective at 4-500 rpm idle. Your downpointing MainJet is everything else up to 2200 rpms governor max. Iff'n ya gitts a slight puff of black smoke when you goose yer throttle, ya might be mainjet rich, turner it 1/8 turn IN (CW) attta time and recheck. I doubt you have 59 yr old sparkplugs, lotta sparkies metal shells just plain rust, don't hurt sparkies none. (just yer eyeballs) howsomevers, never hurts to remove your sparkies (blow away enny dirt innna the depression) and check the color of the center insulator and the the gap (0.025) and sharpness of the metal electrodes. Color should be a dry yellowish-tanish-grayish insulator. Sooty black is carb too rich. Oily black is worn engine piston rings. (use hotter plugs to burn off the oil, but eventually will be an engine overhaul in your future) Most find that the hotter AutoLite AL-437 sparkie works real good with modern no-lead gasoline 'cuz the colder OEM Champion H-10 fouls (clogs the gap) eazier. Occasional misses and ruff running can also be caused by old hard and cracked sparkie wires. You doubt? Go out and watch the little blue sparkies dance on your sparkie wire in a cold DARK nite. Sparkie wires should be limp and flexable and stranded copper core, NOT modern anti-radiostatic carbon thread core. New coppercore sparkie wires $10. (cheap)..... ..... .Dell
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