E
5-1
EMU17520
TROUBLESHOOTING
A problem in the fuel, compression, or ignition systems can cause poor starting, loss of
power, or other problems. The troubleshooting chart describes basic checks and possible
remedies. (This chart covers all Yamaha outboard motors. Therefore, some items may not
apply to your model.)
If your outboard motor requires repair, bring it to a Yamaha dealer.
If the engine warning indicator is flashing, consult your Yamaha dealer.
A. Starter will not
operate.
Trouble Possible Cause Remedy
1. Battery capacity weak or low.
2. Battery connections loose or corroded.
3. Fuse for electric start circuit blown.
4. Starter components faulty.
5. Engine stop switch lanyard not
attached.
6. Shift lever in gear.
1. Check battery condition. Use battery
of recommended capacity.
2. Tighten battery cables and clean
battery terminals.
3. Check for cause of electric overload
and repair. Replace fuse with one of
correct amperage.
4. Have serviced by a Yamaha dealer.
5. Attach lanyard.
6. Shift to neutral.
B. Engine will not start
(Starter operates).
1. Fuel tank empty.
2. Fuel contaminated or stale.
3. Fuel filter clogged.
4. Starting procedure incorrect.
5. Fuel pump malfunctions.
6. Spark plug(s) fouled or incorrect type.
7. Spark plug cap(s) fitted incorrectly.
8. Poor connections or damaged ignition
wiring.
9. Ignition parts faulty.
10. Engine stop switch lanyard not
attached.
11. Shift lever in gear.
12. Engine inner parts damaged.
13. Fuel cock is closed.
1. Fill tank with clean, fresh fuel.
2. Fill tank with clean, fresh fuel.
3. Clean or replace filter.
4. Read “STARTING ENGINE” section.
5. Have serviced by a Yamaha dealer.
6. Inspect spark plug(s). Clean or
replace with recommended type.
7. Check and re-fit cap(s).
8. Check wires for wear or breaks.
Tighten all loose connections.
Replace worn or broken wires.
9. Have serviced by a Yamaha dealer.
10. Attach lanyard.
11. Shift to neutral.
12. Have serviced by a Yamaha dealer.
13. Open the fuel cock.
63V-9-K2-A0-5 3/17/03 3:44 PM Page 4
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