I thought the same thing about sticky vales so I have been running engine out of 1 QT gas container. Pumped marvel Mystery Oil thru the intake with engine running, Same oil in the gas. Removed the valve adjusting covers and oiled valve stems and springs with pump oil can with engine running. Same deal ,nothing changed. Still would like to know if uneven fire/odd fire Wisconsin can have a even vacuum reading at 500/600RPM?
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