Yamaha VF175 Owner's Manual page 105

A. Install correct propeller to operate out-
board motor at its recommended speed
(r/min) range.
Q. Is outboard motor mounted at incorrect
height on transom?
A. Have outboard motor adjusted to proper
transom height.
Q. Has alert system activated?
A. Find and correct cause of alert.
Q. Is boat bottom fouled with marine growth?
A. Clean boat bottom.
Q. Are spark plugs fouled or of incorrect ty-
pe?
A. Inspect spark plugs. Clean or replace with
recommended type.
Q. Are weeds or other foreign material tan-
gled on gear housing?
A. Remove foreign material and clean lower
unit.
Q. Is fuel system clogged?
A. Inspect for pinched or kinked fuel line or
other obstructions in fuel system.
Q. Is fuel filter clogged?
A. Clean or replace fuel 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 ignition wiring damaged or poorly con-
nected?
Trouble Recovery
A. Inspect wires for breaks and wear. Have
connections tightened and broken or worn
wires replaced by a Yamaha dealer.
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. Replace engine oil with specified type.
Q. Is thermostat clogged or malfunctioning?
A. Have serviced by a Yamaha dealer.
Q. Is fuel tank air vent restricted or clogged?
A. Remove obstruction.
Q. Is fuel pump malfunctioning?
A. Have serviced by a Yamaha dealer.
Q. Is fuel joint connection incorrect?
A. Connect correctly.
Q. Is heat range of spark plugs incorrect?
A. Inspect spark plugs and replace with rec-
ommended type.
Q. Is engine not responding properly to re-
mote control lever position?
A. Have serviced by a Yamaha dealer.
Engine vibrates excessively.
Q. Is propeller damaged?
A. Have propeller repaired or replaced.
Q. Is propeller shaft damaged?
A. Have serviced by a Yamaha dealer.
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