1970 Johnson 85HP Outboards Service Repair Manual P/N JM-7010, Page 19Get this manual

1970 Johnson 85HP Outboards Service Repair Manual P/N JM-7010, Page 19

Quality of the image is intentionally reduced!

DESCRI PTION

The upstroke of the piston in the cylinder creates suction that draws air through the throatrestriction in the throat, caHed venturi, has the effect of reducing air pressure