YAMAHA 9.9 PRACTICE TEST EXAM
QUESTIONS AND ANSWERS | 2026
UPDATE | 100% CORRECT.
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 - ANS d.) all of the above
What gear does the engine need to be in when installing the lower unit? - ANS Reverse
What does L represent in F9.9LEB - ANS 20" shaft length
What can cause ignition noise? - ANS The ignition coil when the secondary discharges
As the piston lowers on the intake stroke, an area of ____________ is created in the combustion
chamber - ANS Low pressure
True or False: The less blade surface area a prop has, the better hole shot it will produce. -
ANS False, the more blade surface area, the better the hole shot will be
What is the recommended interval for changing the engine oil? - ANS Every 100 hours
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, What are the four essential functions of an internal combustion engine? - ANS intake,
compression, combustion, exhaust
True or False: YIEC can be bought over the counter at your local dealership. - ANS 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
c.) Igniting a fuel mixture before the timed ignition occurs
d.) The igniting of the fuel mixture before the piston reaches TDC - ANS 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? - ANS All of the engine oil cannot be removed
During which two events does the piston move toward the top of the cylinder? - ANS exhaust
and compression
When discussing propellor pitch, each inch of pitch is equal to about how many RPM? -
ANS 150+/-50 RPM
When should you replace the anodes on a Yamaha outboard? - ANS When only 1/2 replace
(50% depleted)
True or False: Pitch is the distance a 3 bladed prop would theoretically travel in three full
revolutions, if traveling through a solid - ANS False
Anodes are replaced at ____ % gone - ANS 50%
True or False: The F/T 9.9 uses an SDS prop hub - ANS False, they used a standard pressed in
model
@COPYRIGHT ALL RIGHTS RESERVED PAGE 2 OF 7
QUESTIONS AND ANSWERS | 2026
UPDATE | 100% CORRECT.
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 - ANS d.) all of the above
What gear does the engine need to be in when installing the lower unit? - ANS Reverse
What does L represent in F9.9LEB - ANS 20" shaft length
What can cause ignition noise? - ANS The ignition coil when the secondary discharges
As the piston lowers on the intake stroke, an area of ____________ is created in the combustion
chamber - ANS Low pressure
True or False: The less blade surface area a prop has, the better hole shot it will produce. -
ANS False, the more blade surface area, the better the hole shot will be
What is the recommended interval for changing the engine oil? - ANS Every 100 hours
@COPYRIGHT ALL RIGHTS RESERVED PAGE 1 OF 7
, What are the four essential functions of an internal combustion engine? - ANS intake,
compression, combustion, exhaust
True or False: YIEC can be bought over the counter at your local dealership. - ANS 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
c.) Igniting a fuel mixture before the timed ignition occurs
d.) The igniting of the fuel mixture before the piston reaches TDC - ANS 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? - ANS All of the engine oil cannot be removed
During which two events does the piston move toward the top of the cylinder? - ANS exhaust
and compression
When discussing propellor pitch, each inch of pitch is equal to about how many RPM? -
ANS 150+/-50 RPM
When should you replace the anodes on a Yamaha outboard? - ANS When only 1/2 replace
(50% depleted)
True or False: Pitch is the distance a 3 bladed prop would theoretically travel in three full
revolutions, if traveling through a solid - ANS False
Anodes are replaced at ____ % gone - ANS 50%
True or False: The F/T 9.9 uses an SDS prop hub - ANS False, they used a standard pressed in
model
@COPYRIGHT ALL RIGHTS RESERVED PAGE 2 OF 7
