engine YAMAHA GP800R 2021 Owner's Manual

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EJU00411a
Fuel and oil
This engine uses Yamaha’s oil injection
system, which provides superior lubrication
by ensuring the proper oil ratio for all operat-
ing conditions. No fuel premixing is neces-
sary except during the engine break-in
period. Simply pour gasoline into the fuel
tank and oil into the oil tank.
Gasoline
WARNING
GASOLINE AND ITS VAPORS ARE
HIGHLY FLAMMABLE AND EXPLOSIVE!
●Do not smoke when refueling, and
keep away from sparks, flames, or
other sources of ignition.
●Stop engine before refueling.
●Refuel in a well-ventilated area. Do not
stand or sit on the watercraft while
refueling in case of fire.
●Take care not to spill gasoline. If gaso-
line spills, wipe it up immediately with
dry rags. Always properly dispose of
gasoline-soaked rags.
●Avoid overfilling the fuel tank. Stop fill-
ing when the fuel level just reaches the
bottom of the filler tube. Do not fill up
the filler tube because fuel expands as
it warms up and could overflow.
●Tighten the filler cap securely after
refueling.
●If you should swallow some gasoline,
inhale a lot of gasoline vapor, or get
gasoline in your eyes, get immediate
medical attention.
●If any gasoline spills onto your skin,
immediately wash with soap and
water. Change clothing if gasoline
spills on it.

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CAUTION:
Use only fresh gasoline that has been
stored in clean containers.
Gasohol
There are two types of gasohol: gasohol
containing ethanol and that containing meth-
anol.
Gasohol containing ethanol can be used
if ethanol content does not exceed 10 % and
the fuel meets minimum octane ratings.
Gasohol containing methanol is not rec-
ommended by Yamaha because it can
cause fuel system damage or engine perfor-
mance problems.Recommended gasoline:
Regular unleaded gasoline with
a minimum octane rating of
86 (Pump octane number) = (R+M)/2
90 (Research octane number)

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EJU00724a
Filling the fuel tank
CAUTION:
Be careful when refueling. Avoid getting
water or other contaminants in the fuel
tank. Contaminated fuel can cause poor
running or engine damage.
1. Open the hood and remove the front
storage compartment, to check the fuel
level. (See page 2-19 for front storage
compartment.)
2. Open the fuel tank filler cap, and slowly
add fuel to the fuel tank.
3. Stop filling when the fuel just reaches the
bottom of the filler tube on the fuel tank.
Do not fill into the filler tube, because
fuel could spill out.
Fuel tank capacity:
Total: 60 L (15.9 US gal, 13.2 Imp gal)
Reserve: 10 L (2.64 US gal, 2.20 Imp gal)

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EJU00324a
2-stroke engine oil
If YAMALUBE 2-W is not available,
another 2-stroke engine oil with an NMMA-
certified TC-W3 rating may be used.Recommended engine oil:
YAMALUBE 2-W
EJU00419a
Filling the oil tank
WARNING
●Do not add gasoline to the oil tank.
Fire or explosion could result.
●Oil in the bilge is a serious fire hazard.
Wipe up any spilled oil immediately.
CAUTION:
Do not allow the oil tank to become com-
pletely empty. If the oil tank becomes
empty the oil injection pump must be
bled to ensure proper oil flow, otherwise
engine damage may occur. If bleeding of
the oil pump is necessary, have a
Yamaha dealer bleed it.
1. Remove the seat to watch the oil level.
(See page 2-5 for seat.)
2. Open the oil tank filler cap, and very
slowly add engine oil to the oil tank.
3. Stop filling when the oil just reaches the
top of oil tank visible.
Oil tank capacity:
5.5 L (1.45 US gal, 1.21 Imp gal)

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EJU00422
Pre-operation checks
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 the seat and front storage compartment
to ventilate engine compartment. Check for fuel
vapors or loose electrical connections3-6
Bilge Check for water and fuel residue and remove if
necessary3-7
Throttle Check that the throttle lever springs back 3-10
Steering system Check for proper steering system operation 3-10
Fuel and oil Check fuel and oil level and add if necessary
Check hoses and tanks for leakage3-6
Water separator Check for water and drain if necessary 3-7
Battery Check electrolyte level and battery condition 3-8
Hood Check that the hood is properly secured 2-6
Seat Check that the seat is properly secured 2-5
Hull/Deck Check the hull and deck for cracks or other dam-
age—
Jet unit Check for debris and remove if necessary 3-11
Fire extinguisher Check the condition and replace if necessary 3-9
Engine shut-off cord Check condition and replace is frayed or broken 3-11
Switches Check the start switch, engine stop switch and
engine shut-off switch for proper operation when
the watercraft is in the water3-12
Cooling water pilot outlet Check that water is discharged while the engine
is running and the watercraft is in the water3-12
Multifunction information center Check for warning indications and proper opera-
tion3-12

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EJU00426
Pre-operation check points
Engine compartment
Ventilate the engine compar tment before
each use.
To ventilate the engine compartment,
remove seat and front storage compart-
ment. (See page 2-5 for seat, and 2-19 for
front storage compartment.) Allow the
engine compartment to remain open for a
few minutes to allow any fuel vapors to
escape. Also, check for loose electrical con-
nections.
WARNING
Failure to ventilate the engine compart-
ment could result in fire or explosion. Do
not start the engine if there is a fuel leak
or a loose electrical connection.
EJU00427-30a
Fuel and oil systems
Check the fuel system for leakage, cracks
or malfunctions before each use. (See page
4-9 for check points and correct proce-
dures.)
1. Remove the fuel tank filler cap to release
any pressure that might have built up in
the fuel tank.
2. Remove seat and front storage compart-
ment. (See page 2-5 for seat, and 2-19
for front storage compartment.)
3. Check the fuel and oil levels in the tanks
and replenish if necessary. (See page 3-3
for filling instructions.)
4. Turn the fuel cock to the “ON” position.

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EJU00432a
Water separator
Check the water separator 1 for water.
Normally the water separator is empty. The
water separator retains any water entering
through the fuel tank breather hose if the
watercraft is capsized.
If water remains in the water separator,
drain it by removing the drain screw 2.
Install the drain screw again after draining
the water separator.
EJU00433a
Bilge
Check for moisture and fuel residue in the
bilge.
Excessive water in the bilge can splash
into the carburetor and engine which could
cause engine damage.
To remove water from the bilge:
1. Remove the stern drain plugs.
2. Raise the bow of the watercraft until the
water drains.
3. After the water has drained, wipe the
bilge with dry rags to make sure that the
bilge is thoroughly dry.
4. Install the drain plugs.
CAUTION:
●Make sure that the stern drain plugs
are tightened securely before launch-
ing the watercraft.
●Clean any foreign materials, such as
dirt or sand, from the drain plug
threads before installing the drain
plugs.

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EJU00435a
Battery
Check the battery condition and the elec-
trolyte level.
Check that the battery leads are tightened
securely and there is no corrosion on the
battery terminals.
WARNING
The battery must always be fully charged
and in good condition. Loss of battery
power may leave you stranded. Never
operate the watercraft if the battery does
not have sufficient power to start the
engine or if it shows any other signs of
decreased power.
Make sure that the breather hose is prop-
erly connected and that it is not damaged or
obstructed.
Make sure that the battery is securely
held in place.
1
Positive (+): Red lead
2
Negative (–): Black lead
3
Breather hose

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EJU00447
Throttle
Squeeze and release the throttle lever
several times to make sure that there is no
hesitation in its travel. It should be smooth
over the complete range, and spring back to
the idle position when released.
WARNING
Before starting the engine, always check
the operation of the throttle lever. It
should move smoothly through its full
range of operation, and should spring
back to the idle position when released.
EJU00448
Steering system
Check for looseness in the handlebars.
Turn them as far as possible to the right
and left to make sure that operation is
smooth and unrestricted throughout the
whole range. Make sure that the jet thrust
nozzle also changes directions as the han-
dlebars are turned, and that there is no free
play between the handlebars and the jet
thrust nozzle.

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EJU00451a
Jet unit
Carefully check the jet intake for weeds,
debris, or anything else that might restrict
the intake of water. If the intake is clogged,
cavitation could occur, reducing jet thrust,
and possibly damaging the jet pump.
In some cases, the engine may overheat
because of lack of cooling water, and dam-
age to the engine could result. Engine cool-
ing water is fed to the engine by the jet
pump. (See page 5-4 for jet intake cleaning
procedures.)
WARNING
●Keep away from intake grate while
engine is on. Items such as long hair,
loose clothing, or PFD straps can
become entangled in moving parts
resulting in severe injury or drowning.
●Stop the engine and remove the clip
from the engine shut-off switch before
removing any debris or weeds, which
may have collected around the jet
intake.
EJU00004n
Engine shut-off cord (lanyard)
Check that the engine shut-off cord is not
frayed or broken. If the cord is damaged,
replace it; never try to repair it or tie it
together.