1996 Mercury Force 25 HP Service Manual 90-830894 895, Page 34Get this manual
Carburetor Adjustments Adjustthe carburetor for better starting and low speed operationChanges in temperature, humidity, or barometric pressure can effect performanceADJUSTING IDLE MIXTURE
IMPORTANT: When adjusting the idle mixture screw, turn carefully and gentleDo not force needle into seat
NOTE: After idle speed is set, the index mark on the throttle cam may not align with the pickup rollerThis is normal
1Turn idle mixture screw clockwise until it seats in the carburetor, 2Open idle mixture screw 1-12 turns (counterclockwise)3Start motor and warm up to operating temperature4Move throttle lever to shift position5Shift motor to forward gear and turn idle mixture screw (close) to the lowest "runable setting"6Slowly turn idle mixture screw counterclockwise until motor speed decreases and operation becomes rough due to over-rich mixtureNote position of screwaIdle Speed Screw
ADJUSTING THROTTLE SHUTTER NOTE: Engine should NOT be running when making the following adjustment1Shift motor to forward gear position2Advance throttle to wide open throttle position3Check throttle shutter positionTHROTTLE SHUTTER MUST BE HORIZONTAL