1997+ Mercury 35/40HP 2 Cylinder Outboards Service Manual PN 90-826148R2, Page 153Get this manual

1997+ Mercury 35/40HP 2 Cylinder Outboards Service Manual PN 90-826148R2, Page 153

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Main (High Speed) Jet Adjustment The carburetor has fixed high speed jetExtreme changes in weather (temperature and humidity) and or elevation may result in too lean or rich fuel mixture at wide-open-