3-5
E
EJU01346
Pre-operation checks
EJU01347
Pre-operation check list
Before operating this watercraft, perform the checks in the following check list. See the
accompanying text in this chapter for details on how to perform the checks.
WARNING@ If any item in the pre-operation check list is not working properly, have it inspected
and repaired before operating the watercraft, otherwise an accident could occur.
@
NOTE:@ Pre-operation checks should be made thoroughly each time the watercraft is used. This pro-
cedure can be completed in a short time. It is worth the time spent to assure safety and reli-
ability.
@
ITEM ROUTINE PAGE
Engine compartment Remove all seats and the front storage compart-
ment to ventilate the engine compartment.
Check for fuel vapors and loose electrical con-
nections.3-6
Bilge Check for water and fuel and remove if neces-
sary.3-8
Stern drain plugs Check for proper installation. 3-8
Throttle lever Check that the throttle lever springs back
smoothly.3-11
Steering system Check for proper operation. 3-11
Fuel and oil Check fuel and oil levels and add if necessary.
Check the hoses and tanks for leakage.3-7
Water separator Check for water and drain if necessary. 3-7
Battery Check electrolyte level and battery condition. 3-9
Hood Check that the hood is properly secured. 2-6
Front and rear seats Check that the seats are properly secured. 2-4–2-5
Hull and deck Check the hull and deck for cracks or other dam-
age.3-6
Jet unit Check for debris and remove if necessary. 3-12
Fire extinguisher Check condition and replace if necessary. 3-10
Engine shut-off cord Check condition and replace if frayed or broken. 3-12
Switches Check the start switch, engine stop switch, and
engine shut-off switch for proper operation.3-13
Cooling water pilot outlet Check that water is discharged while the engine
is running and the watercraft is in the water.3-12
UF0M75.book Page 5 Thursday, May 29, 2003 9:53 AM
4-14
E
EJU01342
Cleaning and adjusting the
spark plugs
The spark plug is an important engine
component and is easy to inspect. The con-
dition of the spark plug can indicate some-
thing about the condition of the engine. For
example, if the center electrode porcelain is
very white, this could indicate an intake air
leak or carburetion problem in that cylinder.
Do not attempt to diagnose any problems
yourself. Have a Yamaha dealer service the
watercraft.
Remove and inspect the spark plug peri-
odically; heat and deposits will cause the
spark plug to slowly break down and erode.
If electrode erosion becomes excessive, or if
carbon and other deposits are excessive,
replace the spark plug with the specified
plug.
Measure the spark plug gap a with a
wire thickness gauge before installing the
spark plug. Adjust the gap to specification if
necessary.
To reinstall spark plug:
1. Clean the gasket surface.
2. Wipe any dirt from the threads of the
spark plug.
3. Screw the spark plug to the correct
torque. Standard spark plug: BR8HS
Spark plug gap:
0.6–0.7 mm (0.024–0.028 in)
Spark plug torque:
25 N·m (2.5 kgf·m, 18 ft·lb)
UF0M75.book Page 14 Thursday, May 29, 2003 9:53 AM
