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EMU01204¯
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.
Trouble Possible Cause Remedy
A. Starter will not
operate.
1. Battery capacity weak or low. 1. Check battery condition. Use battery of
recommended capacity.
2. Battery connections loose or corroded. 2. Tighten battery cables and clean bat-
tery terminals.
3. Fuse for electric start circuit blown. 3. Check for cause of electric overload
and repair. Replace fuse with one of
correct amperage.
4. Starter components faulty. 4. Have serviced by a Yamaha dealer.
5. Engine stop switch lanyard not
attached.
5. Attach lanyard.
6. Shift lever in gear. 6. Shift to neutral.
B. Engine will not start
(Starter operates).
1. Fuel tank empty. 1. Fill tank with clean, fresh fuel.
2. Fuel contaminated or stale. 2. Fill tank with clean, fresh fuel.
3. Fuel filter clogged. 3. Clean or replace filter.
4. Starting procedure incorrect. 4. Read “STARTING ENGINE” section.
5. Fuel pump malfunctions. 5. Have serviced by a Yamaha dealer.
6. Spark plug(s) fouled or incorrect type. 6. Inspect spark plug(s). Clean or replace
with recommended type.
7. Spark plug cap(s) fitted incorrectly. 7. Check and re-fit cap(s).
8. Poor connections or damaged ignition
wiring.
8. Check wires for wear or breaks.
Tighten all loose connections.
Replace worn or broken wires.
9. Ignition parts faulty. 9. Have serviced by a Yamaha dealer.
10. Engine stop switch lanyard not
attached.
10. Attach lanyard.
11. Shift lever in gear. 11. Shift to neutral.
12. Engine inner parts damaged. 12. Have serviced by a Yamaha dealer.
U68T13.book Page 1 Wednesday, August 8, 2001 12:37 PM