1st-clean air filter and oil,fresh plugs,good fuel,valves adjusted correctly,check for tears or cracks in intake boots,fire in all cylininders;minimum compression & w/in10% of each other in all cylinders, and no exhaust gasket leaks. once these components are w/in specs. and operable the carburators can be adjusted, as long as they are internally clean and operating as designed.1st- set high idle, then set idle rpm, now synchronize vacuum on carburator set,now readjust idle rpm.
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