1973 Johnson 2HP Outboard Motor Model 2R73 Service Repair Manual JM-7301, Page 17Get this manual

1973 Johnson 2HP Outboard Motor Model 2R73 Service Repair Manual JM-7301, Page 17

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DESCRI PlON

-ATMOSPHERIC AI PRESSURE

upstroke of the piston in the cylinder creates suction that draws air through the throatrestriction in the throat, called venturi, has th