1|Page
Yamaha 9.9 Exam Questions And Answers
(Guaranteed A+)
When does fuel deteriorate?
a.) as soon as it leaves the refinery
b.) when stored for prolonged periods of time
c.) when water is mixed with ethanol in gasoline
d.) all of the above - .....ANSWER ...✔✔ d.) all of the
above
What gear does the engine need to be in when
installing the lower unit? - .....ANSWER ...✔✔ Reverse
What does L represent in F9.9LEB - .....ANSWER
...✔✔ 20" shaft length
What can cause ignition noise? - .....ANSWER ...✔✔
The ignition coil when the secondary discharges
,2|Page
As the piston lowers on the intake stroke, an area of
____________ is created in the combustion chamber -
.....ANSWER ...✔✔ Low pressure
True or False: The less blade surface area a prop has,
the better hole shot it will produce. - .....ANSWER
...✔✔ False, the more blade surface area, the better
the hole shot will be
What is the recommended interval for changing the
engine oil? - .....ANSWER ...✔✔ Every 100 hours
What are the four essential functions of an internal
combustion engine? - .....ANSWER ...✔✔ intake,
compression, combustion, exhaust
True or False: YIEC can be bought over the counter at
your local dealership. - .....ANSWER ...✔✔ False
Which of the terms best describes pre-ignition?
a.) High secondary voltage in the ignition coil causes
pre-ignition
b.) The "waste spark" concept is considered pre-ignition
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c.) Igniting a fuel mixture before the timed ignition
occurs
d.) The igniting of the fuel mixture before the piston
reaches TDC - .....ANSWER ...✔✔ c.) Igniting a fuel
mixture before the timed ignition occurs
Service manuals call for the engine oil capacity to be a
certain amount, but the periodic maintenance quantity is
different. Why? - .....ANSWER ...✔✔ All of the engine
oil cannot be removed
During which two events does the piston move toward
the top of the cylinder? - .....ANSWER ...✔✔ exhaust
and compression
When discussing propellor pitch, each inch of pitch is
equal to about how many RPM? - .....ANSWER ...✔✔
150+/-50 RPM
When should you replace the anodes on a Yamaha
outboard? - .....ANSWER ...✔✔ When only 1/2
replace (50% depleted)
, 4|Page
True or False: Pitch is the distance a 3 bladed prop
would theoretically travel in three full revolutions, if
traveling through a solid - .....ANSWER ...✔✔ False
Anodes are replaced at ____ % gone - .....ANSWER
...✔✔ 50%
True or False: The F/T 9.9 uses an SDS prop hub -
.....ANSWER ...✔✔ False, they used a standard
pressed in model
What best describes the stroke of a piston? -
.....ANSWER ...✔✔ The movement of the piston either
UP or DOWN the cylinder
True or False: No water coming out of the overboard
indicator means the engine is running hot. - .....ANSWER
...✔✔ False
Before you do any extensive valve adjustment on a four
stroke engine, what should you do first? - .....ANSWER
...✔✔ Decarbonize the engine
Yamaha 9.9 Exam Questions And Answers
(Guaranteed A+)
When does fuel deteriorate?
a.) as soon as it leaves the refinery
b.) when stored for prolonged periods of time
c.) when water is mixed with ethanol in gasoline
d.) all of the above - .....ANSWER ...✔✔ d.) all of the
above
What gear does the engine need to be in when
installing the lower unit? - .....ANSWER ...✔✔ Reverse
What does L represent in F9.9LEB - .....ANSWER
...✔✔ 20" shaft length
What can cause ignition noise? - .....ANSWER ...✔✔
The ignition coil when the secondary discharges
,2|Page
As the piston lowers on the intake stroke, an area of
____________ is created in the combustion chamber -
.....ANSWER ...✔✔ Low pressure
True or False: The less blade surface area a prop has,
the better hole shot it will produce. - .....ANSWER
...✔✔ False, the more blade surface area, the better
the hole shot will be
What is the recommended interval for changing the
engine oil? - .....ANSWER ...✔✔ Every 100 hours
What are the four essential functions of an internal
combustion engine? - .....ANSWER ...✔✔ intake,
compression, combustion, exhaust
True or False: YIEC can be bought over the counter at
your local dealership. - .....ANSWER ...✔✔ False
Which of the terms best describes pre-ignition?
a.) High secondary voltage in the ignition coil causes
pre-ignition
b.) The "waste spark" concept is considered pre-ignition
,3|Page
c.) Igniting a fuel mixture before the timed ignition
occurs
d.) The igniting of the fuel mixture before the piston
reaches TDC - .....ANSWER ...✔✔ c.) Igniting a fuel
mixture before the timed ignition occurs
Service manuals call for the engine oil capacity to be a
certain amount, but the periodic maintenance quantity is
different. Why? - .....ANSWER ...✔✔ All of the engine
oil cannot be removed
During which two events does the piston move toward
the top of the cylinder? - .....ANSWER ...✔✔ exhaust
and compression
When discussing propellor pitch, each inch of pitch is
equal to about how many RPM? - .....ANSWER ...✔✔
150+/-50 RPM
When should you replace the anodes on a Yamaha
outboard? - .....ANSWER ...✔✔ When only 1/2
replace (50% depleted)
, 4|Page
True or False: Pitch is the distance a 3 bladed prop
would theoretically travel in three full revolutions, if
traveling through a solid - .....ANSWER ...✔✔ False
Anodes are replaced at ____ % gone - .....ANSWER
...✔✔ 50%
True or False: The F/T 9.9 uses an SDS prop hub -
.....ANSWER ...✔✔ False, they used a standard
pressed in model
What best describes the stroke of a piston? -
.....ANSWER ...✔✔ The movement of the piston either
UP or DOWN the cylinder
True or False: No water coming out of the overboard
indicator means the engine is running hot. - .....ANSWER
...✔✔ False
Before you do any extensive valve adjustment on a four
stroke engine, what should you do first? - .....ANSWER
...✔✔ Decarbonize the engine
