Exam Questions And Correct Answers

Ohio Motorcycle Mechanic Practice Exam Questions And Correct Answers (Verified Answers) Plus Rationales 2025|2026 Q&A | Instant Download Pdf

• What is the primary function of a motorcycle carburetor?
• To lubricate the engine
• To mix fuel and air in correct proportions
• To cool the engine
• To filter impurities

Rationale: The carburetor’s main purpose is to deliver an air-fuel mixture to

the combustion chamber in proper ratio for efficient combustion.

• What happens if the air-fuel mixture is too rich?
• Engine runs hotter
• Engine runs rough and produces black smoke
• Engine gains more power 1 / 4

• Spark plug appears white

Rationale: A rich mixture contains excess fuel, causing incomplete

combustion and black exhaust smoke.

• What does a spark plug heat range indicate?
• The temperature of the engine
• The size of the spark plug
• The plug’s ability to dissipate heat
• The ignition coil voltage

Rationale: Heat range measures how quickly a spark plug can transfer heat

to the cylinder head.

• What is the primary function of the stator in a motorcycle?
• Stores electricity
• Generates AC current for the electrical system
• Converts DC to AC
• Starts the engine

Rationale: The stator works with the rotor to generate alternating current

that powers the motorcycle’s electrical system.

• What type of oil is commonly used in four-stroke motorcycle engines?
• Two-stroke mix 2 / 4

• Hydraulic oil
• SAE-rated motor oil
• Gear oil only

Rationale: Four-stroke engines use SAE-rated motor oil to lubricate moving

components like valves, pistons, and crankshafts.

• What is the purpose of the clutch in a motorcycle?
• Increases fuel pressure
• Reduces engine noise
• Engages and disengages power from the engine to the transmission
• Increases torque output

Rationale: The clutch allows smooth engagement and disengagement

between the engine and gearbox.

• What could cause a slipping clutch?
• Loose chain
• Worn friction plates
• Tight valve clearance
• Weak spark plug

Rationale: Worn or oil-contaminated friction plates fail to grip properly,

leading to clutch slippage.

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8. The correct air pressure in motorcycle tires should be:

• The maximum listed on the tire
• Any comfortable level
• As recommended by the manufacturer

D. 50 PSI

Rationale: Always inflate tires to manufacturer specifications for safety and

performance.

• What is the main purpose of a fuel filter?
• To regulate pressure
• To increase power
• To remove contaminants from fuel
• To add oxygen

Rationale: Fuel filters prevent debris from entering the carburetor or

injectors, ensuring clean fuel delivery.

• What does a multimeter measure in a motorcycle circuit?
• Only current
• Voltage, current, and resistance
• Fuel mixture
• Tire pressure

Rationale: A multimeter measures electrical quantities including voltage,

current, and resistance for diagnostics.

• / 4