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There is a one valve four stroke? Are you sure, i really cant see any way this would work without a reed cage type setup in the intake. My pushrod lifan motor had two valves, A high performance four stroke can have 4 or even 5 valves on a single cylinder. If the timing is wrong (to advanced) then it can spit and exhaust pulse out the intake at low rpms pushing some fresh mixture back with it.
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