1979 Johnson 2HP Outboards Service Repair Manual, P/N JM-7902, Page 19Get this manual

1979 Johnson 2HP Outboards Service Repair Manual, P/N JM-7902, Page 19

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DESCRI PlON
The upstroke of th piStOI1 il1 the cylil1de ceates suctiOI1 that dl'aws ail' tllougll tlle thoatl'estrictiol1 il1 the th1'oat, caHed vel1turi, l1as the eff ect of educil1 ai pressul'

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