2004 SR Johnson 2 Stroke 9.9, 15, 25, 30 HP Outboards Service Manual, Page 162Get this manual
FUEL SYSTEM CARBURETOR MIXTURE ADJUSTMENT
CARBURETOR MIXTURE ADJUSTMENT
9.915 MODELS
IMPORTANT: Changing original factory fuel mixture calibrations beyond the limits allowed by the tamper resistant device is violation of federal lawAny needle valve adjustments beyond preset limits become the responsibility of the servicing technician andlor the ownerRefer to Emissions Compliance on p150If the carburetor body cover assembly must be replaced; or, if the original calibration settings are lost, the following procedure can be used to make adjustments based on engine performanceAdjustment of the tamper resistant needle valve requires special Torx Screwdriver, PIN 351204Start the engine and run it in FORWARD at onehalf throttleAllow the engine to reach normal operating temperature
Run the engine at slow speed (700 to 800 RPM) and adjust the low-speed needle until the highest consistent RPM is attainedAllow 15 seconds after each adjustment for the engine to respond