1998 Johnson Evinrude "EC" 90, 100C, 105C, 115, 150, 150C, 175 60 deg. LV Service Manual, P/N 520210, Page 94Get this manual
Carburetor Servicing Do not attempt to run engine with any fuel system component disconnected or removedFuel leakage could contribute to fire or explosionCalibration To accommodate changes in factory specifications, weather conditions, or altitude, carburetor calibration can be adjusted without removing the carburetors
The idle mixture is controlled by an adjustable needle The intermediate mixture is controlled by an air bleed orifice The high speed mixture is controlled by fuel orifice Using the engine's model number, refer to current parts catalog and orifice list in Section to determine correct orifice sizeRemoval