5-2
TROUBLE POSSIBLE CAUSE REMEDY Page
Engine runs
• Fuel
Empty • Refill as soon as possible 3-3
irregularly or Stale or • Have serviced at
stalls contaminated Yamaha dealer
Oil and gasoline • Have serviced at
mixture is too rich Yamaha dealer
• Choke Knob is left pulled • Push it in fully 2-8
• Fuel filter
Water or dust • Have serviced at
collected Yamaha dealer
• Spark plug
Fouled or defective • Replace 4-7
Incorrect heat range • Replace 4-7
Gap incorrect • Adjust 4-7
• Spark plug cap
Loose • Fit properly 4-7
Loose electrical
• Tighten or connect properly
4-7
connections
Cracked, torn or
• Replace
damaged
• Carburetor
Incorrect idle
• Adjust 4-13
Adjustment
Clogged
• Have service at
Yamaha dealer
Engine won't run
• Engine
Jet intake clogged • Clean 5-5
over 3,500 rpm
overheat** Cooling system
• Clean 4-1
clogged
Jet Boat speed • Cavitation Jet intake clogged • Clean 5-5
too slow or
• Engine
Jet intake clogged • Clean 5-5
loses power
overheat**
Cooling system
• Clean 4-1
clogged
• Fuel Filter Clogged
• Have serviced at
Yamaha dealer
• Spark plug
Fouled or defective • Replace 4-7
Incorrect heat range • Replace 4-7
Gap incorrect • Adjust 4-7
• Spark plug caps Loose • Fit properly 4-7
• Fuel
Stale or • Have serviced at
contaminated Yamaha dealer
** Engine speed will be limited to 3,500 rpm by the overheat warning device.
5 T
ROUBLESHOOTING & SPECIAL PROCEDURES
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