Trouble Recovery72A. 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 efficientoperation.Q. Is outboard motor mounted at incorrectheight on transom?A. Have outboard motor adjusted to propertransom 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 withrecommended type.Q. Are weeds or other foreign material tan-gled on gear housing?A. Remove foreign material and clean lowerunit.Q. Is fuel system obstructed?A. Check for pinched or kinked fuel line orother 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 poorlyconnected?A. Check wires for wear or breaks. Tighten allloose connections. Replace worn or brokenwires.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?