Question

1
multiple choice 1 point
if the air-and-fuel mixture to a motorcycle engine is too rich, the problem could be caused by
○ a too-full gas tank
○ an empty gas tank
○ an air leak between the carburetor and the intake manifold
○ leaving the choke on after the engine has warmed up

2
true or false 1 point
if you are unsure of the cause of a problem you should begin disassembling the motorcycle.
○ true
○ false

Explanation:

Question 1

A rich air - fuel mixture means there is too much fuel relative to air.

• A too - full gas tank doesn't directly cause a rich mixture in the engine's intake (it's about the tank level, not the mixture ratio).
• An empty gas tank would lead to a lean or no mixture, not rich.
• An air leak would let in more air, making the mixture lean.
• Leaving the choke on after the engine warms up: the choke restricts air, so more fuel is drawn, creating a rich mixture.

If you don't know the cause of a motorcycle problem, disassembling it randomly can cause more damage and make troubleshooting harder. You should first diagnose the problem properly. So the statement is false.

Answer:

D. leaving the choke on after the engine has warmed up

Question 2