5-2
E
Engine runs irregu-
larly or stallsFuel Empty Refill as soon as 
possible3-3
Stale or contaminated Have serviced by 
Yamaha dealer4-10
Choke Knob pulled Push fully in 2-9
Fuel filter Clogged or water 
pooledHave serviced by 
Yamaha dealer4-11
Fuel tank Water or dirt present Have serviced by 
Yamaha dealer4-11
Spark plug Fouled or defective Replace 4-14
Incorrect heat range Replace 4-14
Gap incorrect Adjust 4-14
Spark plug cap Loose Connect properly 4-14
Cracked, torn, or dam-
agedReplace
—
Electrical 
wiringLoose connection Tighten or connect 
properly—
Carburetor Incorrect idle adjust-
mentAdjust idle
4-20
Clogged Have serviced by 
Yamaha dealer—
Warning light or 
indicator blinksFuel level Empty Refill as soon as possi-
ble3-3
Oil filter clogged Clean 4-12
Wate rcr af t slow  or  
loses powerCavitation Jet intake clogged Clean 5-3
Impeller damaged or 
wornHave serviced by
Yamaha dealer—
Engine over-
heatedJet intake clogged Clean
5-3
Fuel filter Clogged Have serviced by
Yamaha dealer4-11
Spark plug Fouled or defective Replace 4-14
Incorrect heat range Replace 4-14
Gap incorrect Adjust 4-14
Spark plug 
capsLoose Connect properly
4-14
Electrical 
wiringLoose connection Tighten or connect 
properly—
Fuel Stale or contaminated Have serviced by
Yamaha dealer4-10
Bilge Water in bilge Drain 3-7 TROUBLE POSSIBLE CAUSE REMEDY PAGE
UF0M73.book  Page 2  Thursday, August 2, 2001  5:57 PM