Yamaha F4 Manuel De L'utilisateur page 78

Trouble Recovery
A. Open air vent valve.
Q. Is choke knob pulled out?
A. Return to home position.
Q. Is carburetor clogged?
A. Have serviced by a Yamaha dealer.
Q. Is fuel joint connection incorrect?
A. Connect correctly.
Q. Is throttle cable adjustment incorrect?
A. Have serviced by a Yamaha dealer.
Engine power loss.
Q. Is propeller damaged?
A. Have propeller repaired or replaced.
Q. Is propeller pitch or diameter incorrect?
A. Install correct propeller to operate out-
board at its recommended speed (r/min)
range.
Q. Is trim angle incorrect?
A. Adjust trim angle to achieve most efficient
operation.
Q. Is outboard motor mounted at incorrect
height on transom?
A. Have outboard motor adjusted to proper
transom height.
Q. Is boat bottom fouled with marine growth?
A. Clean boat bottom.
Q. Is spark plug fouled or of incorrect type?
A. Inspect spark plug. Clean or replace with
recommended type.
Q. Are weeds or other foreign material tan-
gled on gear housing?
72
A. Remove foreign material and clean lower
unit.
Q. Is fuel system obstructed?
A. Check for pinched or kinked fuel line or
other obstructions in fuel system.
Q. Is fuel filter clogged?
A. Clean or replace filter.
Q. Is fuel contaminated or stale?
A. Fill tank with clean, fresh fuel.
Q. Is spark plug gap incorrect?
A. Replace spark plug.
Q. Is spark plug wiring damaged or poorly
connected?
A. Check wires for wear or breaks. Tighten all
loose connections. Replace worn or broken
wires.
Q. Are electrical parts malfunctioning?
A. Have serviced by a Yamaha dealer.
Q. Is specified fuel not being used?
A. Replace fuel with specified type.
Q. Is specified engine oil not being used?
A. Check and replace oil with specified type.
Q. Is thermostat malfunctioning or clogged?
A. Have serviced by a Yamaha dealer.
Q. Is air vent valve closed?
A. Open air vent valve.
Q. Is fuel pump malfunctioning?
A. Have serviced by a Yamaha dealer.
Q. Is fuel joint connection incorrect?