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I've heard various opinions on this topic so...When running a primary belt drive instead of a chain on a big twin flathead, can the front chain oiler metering screw be turned in completely (i.e. shut off) and outlet tube plugged? I am unsure as to if the front chain oiling passages also serve for necessary crankcase breathing/venting. I know from experience that turning off the front chain oiler on a 50s FL results in too much crankcase pressure and oil starts seeping from various places, most notably the pushrod tubes.
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