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5-2
E
Engine runs irregu-
larly or stalls
Fuel Empty Refill as soon as possi-
ble
3-4
Stale or contaminated Have serviced by
Yamaha dealer
4-10
Too much oil in fuel
mixing ratio
Correct fuel-to-oil ratio
to 50:1
3-3
Choke Knob is left pulled Push fully in 2-6
Fuel filter Clogged or water
pooled
Have serviced by
Yamaha dealer
4-11
Fuel tank Water or dirt present Have serviced by
Yamaha dealer
4-11
Spark plug Fouled or defective Replace 4-13
Incorrect heat range Replace 4-13
Gap incorrect Adjust 4-13
Spark plug cap Loose Connect properly 4-13
Cracked, torn or dam-
aged
Replace
4-13
Electrical wir-
ing
Loose electrical con-
nections
Tighten or connect
properly
—
Carburetor Incorrect idle adjust-
ment
Adjust idle
4-19
Clogged Have serviced by
Yamaha dealer
4-19
Watercraft slow or
loses power
Cavitation Jet intake clogged Clean 5-3
Impeller damaged or
worn
Have serviced by
Yamaha dealer
5-3
Engine over-
heated
Jet intake clogged Clean
5-3
Fuel filter Clogged Have serviced by
Yamaha dealer
4-11
Spark plug Fouled or defective Replace 4-13
Incorrect heat range Replace 4-13
Gap incorrect Adjust 4-13
Spark plug
caps
Loose Connect properly
4-13
Fuel Stale or contaminated Have serviced by
Yamaha dealer
4-10
TROUBLE POSSIBLE CAUSE REMEDY PAGE
UF1N12.book Page 2 Wednesday, June 11, 2003 1:22 PM
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