Michigan Small Engine Repair
Technician Exam Practice Questions
And Correct Answers (Verified Answers)
Plus Rationale 2026 Q&A| Instant
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1. A four-cycle small engine differs from a two-cycle engine because it:
A. mixes oil with fuel before combustion
B. completes a power cycle in two strokes
C. uses separate oil and gasoline reservoirs
D. operates without valves
This answer is correct because four-cycle engines have distinct
lubrication and fuel systems with separate oil and gasoline, unlike
two-cycle engines that mix oil with fuel.
2. The purpose of the flywheel key in a small engine is to:
A. secure the carburetor to the intake manifold
B. maintain proper ignition timing
C. regulate governor speed
D. support the crankshaft bearings
This answer is correct because the flywheel key ensures that the
flywheel remains properly aligned on the crankshaft for accurate
ignition timing.
3. Pre-ignition in a small engine is often caused by:
A. low compression
B. carbon deposits in the combustion chamber
C. excessive oil in the crankcase
D. a faulty muffler gasket
, This answer is correct because carbon buildup increases compression
and hotspots that lead to premature ignition of the fuel/air mixture.
4. A choke valve in a carburetor is used to:
A. increase engine speed during load
B. reduce spark intensity at startup
C. enrich the fuel mixture for cold starts
D. regulate oil flow to the crankcase
This answer is correct because the choke restricts airflow to provide a
richer fuel mixture needed for a cold engine to start.
5. Which of the following components controls engine speed under
varying loads?
A. governor
B. heat shield
C. throttle linkage
D. muffler baffle
This answer is correct because the governor adjusts throttle position
automatically to maintain consistent engine speed.
6. Spark plug electrode gap affects:
A. valve timing
B. combustion efficiency and starting performance
C. fuel pump pressure
D. crankshaft balance
This answer is correct because the correct gap ensures proper spark
energy for efficient combustion.
7. The typical symptom of a restricted air filter is:
A. engine backfire under acceleration
B. excessive oil consumption
C. poor performance due to inadequate airflow
D. low coolant levels
This answer is correct because a dirty filter limits air entering the
engine, reducing performance.
8. A compression test on a small engine is used to determine:
A. the condition of the fuel filter
B. the health of piston rings and valves
C. proper carburetor float height
, D. effectiveness of the spark plug
This answer is correct because compression readings help assess
whether internal sealing components are functioning properly.
9. When measuring spark plug heat range, a “colder” plug is best for:
A. low-load residential use only
B. high-speed, high-load operation
C. engines with frequent short runs
D. cold weather idle operations
This answer is correct because colder plugs dissipate heat faster,
which is needed in high RPM, heavy load applications.
10. Vibration in a small engine often results from:
A. correct torque on mounting bolts
B. unbalanced rotating assembly
C. over-lubrication in the crankcase
D. clean air intake
This answer is correct because imbalance in moving engine parts
causes vibration.
11. The primary function of a muffler is to:
A. cool the intake air
B. reduce exhaust noise
C. increase fuel pressure
D. control engine speed
This answer is correct because mufflers dissipate sound energy from
exhaust gases.
12. Detonation in small engines typically causes:
A. smoother idling
B. knocking and potential engine damage
C. reduced oil pressure
D. enriched fuel mixture
This answer is correct because detonation is abnormal combustion
that produces a knocking sound and can damage components.
13. A carburetor float bowl holds fuel to:
A. trap water contamination
B. measure exhaust emissions
C. maintain a reservoir of ready fuel for proper mixture
Technician Exam Practice Questions
And Correct Answers (Verified Answers)
Plus Rationale 2026 Q&A| Instant
Download Pdf
1. A four-cycle small engine differs from a two-cycle engine because it:
A. mixes oil with fuel before combustion
B. completes a power cycle in two strokes
C. uses separate oil and gasoline reservoirs
D. operates without valves
This answer is correct because four-cycle engines have distinct
lubrication and fuel systems with separate oil and gasoline, unlike
two-cycle engines that mix oil with fuel.
2. The purpose of the flywheel key in a small engine is to:
A. secure the carburetor to the intake manifold
B. maintain proper ignition timing
C. regulate governor speed
D. support the crankshaft bearings
This answer is correct because the flywheel key ensures that the
flywheel remains properly aligned on the crankshaft for accurate
ignition timing.
3. Pre-ignition in a small engine is often caused by:
A. low compression
B. carbon deposits in the combustion chamber
C. excessive oil in the crankcase
D. a faulty muffler gasket
, This answer is correct because carbon buildup increases compression
and hotspots that lead to premature ignition of the fuel/air mixture.
4. A choke valve in a carburetor is used to:
A. increase engine speed during load
B. reduce spark intensity at startup
C. enrich the fuel mixture for cold starts
D. regulate oil flow to the crankcase
This answer is correct because the choke restricts airflow to provide a
richer fuel mixture needed for a cold engine to start.
5. Which of the following components controls engine speed under
varying loads?
A. governor
B. heat shield
C. throttle linkage
D. muffler baffle
This answer is correct because the governor adjusts throttle position
automatically to maintain consistent engine speed.
6. Spark plug electrode gap affects:
A. valve timing
B. combustion efficiency and starting performance
C. fuel pump pressure
D. crankshaft balance
This answer is correct because the correct gap ensures proper spark
energy for efficient combustion.
7. The typical symptom of a restricted air filter is:
A. engine backfire under acceleration
B. excessive oil consumption
C. poor performance due to inadequate airflow
D. low coolant levels
This answer is correct because a dirty filter limits air entering the
engine, reducing performance.
8. A compression test on a small engine is used to determine:
A. the condition of the fuel filter
B. the health of piston rings and valves
C. proper carburetor float height
, D. effectiveness of the spark plug
This answer is correct because compression readings help assess
whether internal sealing components are functioning properly.
9. When measuring spark plug heat range, a “colder” plug is best for:
A. low-load residential use only
B. high-speed, high-load operation
C. engines with frequent short runs
D. cold weather idle operations
This answer is correct because colder plugs dissipate heat faster,
which is needed in high RPM, heavy load applications.
10. Vibration in a small engine often results from:
A. correct torque on mounting bolts
B. unbalanced rotating assembly
C. over-lubrication in the crankcase
D. clean air intake
This answer is correct because imbalance in moving engine parts
causes vibration.
11. The primary function of a muffler is to:
A. cool the intake air
B. reduce exhaust noise
C. increase fuel pressure
D. control engine speed
This answer is correct because mufflers dissipate sound energy from
exhaust gases.
12. Detonation in small engines typically causes:
A. smoother idling
B. knocking and potential engine damage
C. reduced oil pressure
D. enriched fuel mixture
This answer is correct because detonation is abnormal combustion
that produces a knocking sound and can damage components.
13. A carburetor float bowl holds fuel to:
A. trap water contamination
B. measure exhaust emissions
C. maintain a reservoir of ready fuel for proper mixture
