1968 Evinrude Big Twin, Lark 40 HP Outboards Service Repair Manual P/N 4483, Page 19Get this manual

1968 Evinrude Big Twin, Lark 40 HP Outboards Service Repair Manual P/N 4483, Page 19

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DESCRIPTION INDUCED VENTURI
The upstroke of the piston in the cylinder creates suction that draws air through tlle throatrestriction in the throat, called venturi, has the effect of reducing air

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