Re: will not idle down
If the idle is too low you won't get enough oil thrown onto the culinder walls and cam lobes.
The large old hit and miss engines with 5 foot flywheels run at about 275 to 400 RPM. My friend was playing with his large engine one day and got it to almost come to a dead stop when the piston reached TDC firing. When it fired you could watch the heavy crankshaft actually bend, or call it flex. Fun to watch, but couldn't be doing that crank much good.
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