4-134-12
BLEEDING THE OIL INJECTION
PUMP
➀ Air bleeding screw
To bleed the oil injection pump, loosen
the air bleeding screw on the bleed
hose. Oil will flow into the oil injection
pump. Hold a rag under the screw hole
to catch oil as it spills out. Keep letting
oil run out until there are no bubbles in
the oil. Tighten the screw firmly and
wipe up any spilled oil completely.
Properly dispose of oil soaked rags.
CARBURETOR ADJUSTMENT
The carburetors are vital parts of the
engine and require very sophisticated
adjustment. Most adjusting should be
left to a Yamaha Sport Boat dealer who
has the professional knowledge and
experience to do so. However, the fol-
lowing point may be serviced by the
owner as part of his usual maintenance
routine.
The carburetor was set at the
Yamaha factory after many tests. If
the settings are disturbed without
having technical knowledge, poor
engine performance and damage
may result.
1Throttle stop screw
Trolling Speed (Idle)
NOTE: A diagnostic tachometer is use-
ful for this procedure.
Place the Sport Boat afloat. Start the
engine and warm it up for one or two
minutes.
Using a diagnostic tachometer, adjust
one engine’s speed to specification.
Turn the throttle stop screw clockwise
to increase engine speed or counter-
clockwise to decrease engine speed.
Repeat the procedure on the other
engine.
Trolling speed: 1,200~1,300
11
FUEL FILTER
The fuel filter is a one-piece, dispos-
able type. The filter should be replaced
once a year or after every 200 hours of
operation, or if water is found in the fil-
ter. Take the Sport Boat to your
Yamaha dealer if fuel filter replacement
is required.
Do not try to change the fuel filter
yourself. An incorrectly installed fil-
ter can leak gasoline, which could
lead to fire or explosion. Take the
Sport Boat to your Yamaha dealer
for fuel filter replacement.
FUEL TANK
If the fuel tank needs to be cleaned or
when any water is found in the fuel sys-
tem, take the Sport Boat to your
Yamaha dealer for service.
OIL INJECTION SYSTEM
INSPECTION
Check the oil injection system for leaks,
cracks, or malfunctions. If any problem
is found, do the necessary repair or
replacement as required. If repair is
necessary, consult your nearest
Yamaha dealer.
Check Points:
1. Check the oil tank for damage or
cracks.
2. Check for water or dirt in the oil
tank.
3. Check the oil hose and joint.
4. Check the oil filter.
Oil Tank
Check for oil tank damage or cracks.
Check the oil hose and joint. When the
oil tank needs to be cleaned, or when
any water or dirt is found in the oil tank,
take the Sport Boat to your Yamaha
dealer for service.
Oil Filter Replacement
If the in-line oil filter becomes contami-
nated, see your Yamaha dealer for ser-
vice.
➀ Oil filter
Air enters the oil delivery line when
the oil filter is removed, so the oil
system must be bled properly after
the filter is replaced. Air in the sys-
tem will prevent oil from flowing
properly to the engine, and severe
engine damage will result. Your
Yamaha dealer has the professional
knowledge and experience to bleed
the oil pump properly.
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