Yamaha 9.9 Practice Test
Questions and Correct Solutions
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
D.) All of the above
What gear does the engine need to be in when installing the lower unit?
Reverse
What does L represent in F9.9LEB
20" shaft length
What can cause ignition noise?
The ignition coil when the secondary discharges
As the piston lowers on the intake stroke, an area of ____________ is created in the
combustion chamber
Low pressure
True or False: The less blade surface area a prop has, the better hole shot it will
produce.
False, the more blade surface area, the better the hole shot will be
What is the recommended interval for changing the engine oil?
Every 100 hours
What are the four essential functions of an internal combustion engine?
Intake, compression, combustion, exhaust
True or False: YIEC can be bought over the counter at your local dealership.
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
