Quote:
Originally Posted by cRiPpLe_rOoStEr
But I'm not sure how a reed valve could be so beneficial in a 4-stroke engine which already resorts to mechanically-driven intake valves.
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It helps when the cams have too much overlap like on a motorcycle and especially at low load. The exhaust blows back into the intake and screws up the air fuel ratios and dilutes the intake air. The reed valve prevents the backflow and ensures a higher % of oxygen for good combustion.