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Motorcycle/Small Engine NC II study materials
Motorcycle/Small Engine NC II study resources

Motorcycle/Small Engine NC II practice questions

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Question 1Apply safety practices and environmental protection in motorcycle/small engine servicing

Before starting work in a small engine repair bay, which practice best protects the technician from accidental engine startup while servicing a running-in test stand?

  1. Open the fuel tank cap to relieve vapor pressure
  2. Disconnect the spark plug lead and keep the ignition switch key under personal control Correct answer.
  3. Remove the air filter so the engine breathes freely
  4. Loosen the exhaust muffler bolts so compression is released

Explanation

The standard lockout safeguard in engine servicing is to break the ignition circuit by removing the spark plug lead or cap, and to retain the key so no one else can energize the engine. This prevents an unexpected start that could catch hands, tools, or clothing in the rotating parts.

Question 2Apply safety practices and environmental protection in motorcycle/small engine servicing

Which personal protective equipment is most important when using a compressed-air blow gun to dry carburetor parts?

  1. Safety goggles or a face shield Correct answer.
  2. Ear muffs and a hard hat
  3. Rubber apron and steel-toe boots
  4. Cotton gloves and a dust mask

Explanation

Compressed air can drive metal chips, solvent, and grit into the eyes, so eye and face protection is the primary control when blowing off parts. Hearing and foot protection are useful in the shop but do not address the specific hazard of high-velocity debris.

Question 3Apply safety practices and environmental protection in motorcycle/small engine servicing

A technician must drain used engine oil from a small engine. What is the correct environmental handling procedure?

  1. Collect it in a labeled container and turn it over to a licensed recycler Correct answer.
  2. Pour it into the sanitary sewer because it is biodegradable
  3. Burn it in an open pit behind the shop
  4. Mix it with water and dispose of it in the yard

Explanation

Used oil is a regulated waste that must be stored in a clearly labeled, closed container and transferred to an authorized recycler or collection facility. Dumping it into drains, soil, or open burning contaminates water and air and violates environmental regulations.

Question 4Apply safety practices and environmental protection in motorcycle/small engine servicing

What is the main fire hazard when refueling a small engine that has just been running?

  1. The fuel tank may overflow silently
  2. Hot surfaces and sparks can ignite fuel vapor Correct answer.
  3. The battery may overcharge and explode
  4. The engine oil may foam and overflow

Explanation

Gasoline gives off flammable vapor that can be ignited by a hot exhaust or muffler surface or by a stray spark. Refueling should be done only after the engine has cooled and with the engine off, away from ignition sources.

Question 5Apply safety practices and environmental protection in motorcycle/small engine servicing

Which practice correctly reduces noise exposure when running a small engine on a test bench for extended periods?

  1. Run the engine only at idle to lower the pitch
  2. Stand farther away and cup your hands over your ears
  3. Place the engine on a rubber mat to absorb sound
  4. Wear ear plugs or muffs rated for the measured noise level Correct answer.

Explanation

Hearing protection must be selected to match the noise level, and earmuffs or plugs rated for that exposure are the accepted control. Distance and idle speed reduce but do not eliminate the hazard, and hand cupping is not adequate protection.

Question 6Apply safety practices and environmental protection in motorcycle/small engine servicing

When storing gasoline for the shop, which container is appropriate?

  1. A clear plastic water bottle with a screw cap
  2. A glass jar sealed with tape
  3. An open bucket kept in a shaded area
  4. An approved, labeled fuel container with a self-closing cap Correct answer.

Explanation

Fuel must be kept in a container approved for flammable liquids, clearly labeled, and fitted with a cap that closes tightly to limit vapor escape. Improvised containers can rupture, leak, or be mistaken for other liquids.

Question 7Apply safety practices and environmental protection in motorcycle/small engine servicing

A technician notices the shop's parts washer solvent is splashing onto the floor. Which control follows the hierarchy of hazard control most appropriately?

  1. Install a splash guard or lid on the washer Correct answer.
  2. Schedule more frequent floor mopping
  3. Post a warning sign next to the washer
  4. Provide technicians with extra rags

Explanation

Engineering controls such as a splash guard or lid remove or isolate the hazard at its source and rank above administrative measures and PPE. Signs, rags, and mopping only manage the consequence after the splash occurs.

Question 8Apply safety practices and environmental protection in motorcycle/small engine servicing

Why must a small engine be allowed to cool before the fuel tank is drained for service?

  1. Hot surfaces can ignite fuel vapor during draining Correct answer.
  2. Cold metal seals better against leaks
  3. Cool fuel flows more slowly and is easier to measure
  4. The carburetor float will not settle when warm

Explanation

Draining fuel near a hot muffler or cylinder head risks ignition of gasoline vapor, so the engine should cool first. This is a fire-prevention rule rather than a flow or sealing concern.

Question 9Apply safety practices and environmental protection in motorcycle/small engine servicing

A two-stroke engine is being serviced and the technician must mix fuel and oil. Which environmental practice applies to the leftover mixture?

  1. Store it in a labeled container and use or dispose of it through a licensed waste handler Correct answer.
  2. Add water to it and pour it on gravel
  3. Leave it in an open pan to evaporate
  4. Pour it down a drain because two-stroke mix is diluted

Explanation

Premixed two-stroke fuel is still a flammable hazardous waste and must be kept in a labeled container and handled by an authorized waste service if not used. Evaporation, dilution, and dumping all release hydrocarbons into the environment.

Question 10Apply safety practices and environmental protection in motorcycle/small engine servicing

Which action best prevents carbon monoxide exposure when a small engine is run for tuning indoors?

  1. Open a window slightly and keep the door closed
  2. Wear a respirator while tuning
  3. Route the exhaust outdoors with an extraction hose and ventilate the area Correct answer.
  4. Run the engine only for short bursts without ventilation

Explanation

Carbon monoxide is odorless and can accumulate quickly, so exhaust must be ducted to the outdoors and the space ventilated. Short bursts and a slightly open window do not reliably keep CO below safe limits, and common respirators do not filter CO.

Question 11Apply safety practices and environmental protection in motorcycle/small engine servicing

When lifting a small engine from a bench to a stand, which technique reduces the risk of back injury?

  1. Bend at the waist and twist to place the engine
  2. Keep the load close, bend the knees, and lift with the legs Correct answer.
  3. Hold the engine at arm's length for better balance
  4. Lift quickly to reduce the time under load

Explanation

Safe manual handling keeps the load close to the body, uses the leg muscles, and avoids twisting the spine. Twisting, reaching out, and jerking the load all increase strain on the lower back.

Question 12Apply safety practices and environmental protection in motorcycle/small engine servicing

A technician finds a frayed power cord on a bench grinder used to sharpen lawnmower blades. What is the correct immediate action?

  1. Tag the grinder out of service and report it for repair Correct answer.
  2. Wrap the frayed section with electrical tape and continue
  3. Wear insulated gloves and use it carefully
  4. Move the grinder to a dry area and keep using it

Explanation

Damaged cords on shop equipment must be taken out of service, tagged, and repaired by a qualified person before reuse. Taping, gloves, or relocation do not remove the shock and fire hazard.

Question 13Apply safety practices and environmental protection in motorcycle/small engine servicing

Which is the correct way to store a compressed gas cylinder used for brazing in a small engine shop?

  1. Near the fuel storage rack for convenience
  2. In a locked cabinet with the regulator attached and valve open
  3. Lay it horizontally under a bench
  4. Upright and secured with a chain or strap, valve cap fitted Correct answer.

Explanation

Cylinders should be stored upright and restrained so they cannot fall, with the valve protection cap in place when not in use. They must be kept away from fuel and ignition sources and never laid down loose.

Question 14Apply safety practices and environmental protection in motorcycle/small engine servicing

During carburetor cleaning with an aerosol solvent, the technician works in a small room with the door shut. Which combination of controls is most appropriate?

  1. Use the solvent only outdoors and skip eye protection
  2. Wear a dust mask and keep the room warm
  3. Rely on the solvent's pleasant smell to judge safe levels
  4. Ventilate the area, wear gloves and eye protection, and follow the SDS Correct answer.

Explanation

Solvent vapors and skin contact require ventilation, appropriate gloves, and eye protection, with handling guided by the Safety Data Sheet. Odor is not a reliable indicator of exposure, and a dust mask does not protect against solvent vapor.

Question 15Apply safety practices and environmental protection in motorcycle/small engine servicing

A shop floor has an oily patch near the engine test bench. Which response best follows good housekeeping and spill control?

  1. Cover the patch with cardboard and continue working
  2. Mark the area with a cone and leave it overnight
  3. Clean it immediately with an absorbent and place it in a labeled waste container Correct answer.
  4. Wait until the end of the shift to mop the whole floor

Explanation

Spills should be cleaned up at once using absorbent material, and the used absorbent disposed of as oily waste in a proper container. Cardboard, delay, or a cone alone leaves a slip and fire hazard in place.

Question 16Apply safety practices and environmental protection in motorcycle/small engine servicing

Which of these is the best example of source reduction in a small engine service shop?

  1. Switching to a water-based parts cleaner where the task allows Correct answer.
  2. Installing a larger drain in the wash bay
  3. Recycling used oil filters after crushing them
  4. Buying more absorbent pads in bulk

Explanation

Source reduction means eliminating or substituting the hazardous material or process, such as replacing solvent with a less hazardous cleaner where suitable. Recycling, drainage, and buying more absorbent treat the waste after it is generated.

Question 17Apply safety practices and environmental protection in motorcycle/small engine servicing

A technician must dispose of a nickel-cadmium battery removed from a motorcycle. Which statement is correct?

  1. It can be stored indefinitely in an unlabeled box
  2. It must be handled as hazardous waste through a battery recycler Correct answer.
  3. It can be buried on site if crushed first
  4. It may go in the regular trash if fully discharged

Explanation

Nickel-cadmium batteries contain cadmium, a toxic heavy metal, and must go to a recycler or hazardous waste handler rather than the regular trash. Discharging, crushing, or unlabeled storage does not remove the regulatory and environmental hazard.

Question 18Apply safety practices and environmental protection in motorcycle/small engine servicing

An engine is run on a test stand and the technician notices exhaust smoke drifting toward a nearby worker. What is the most effective corrective measure?

  1. Ask the nearby worker to step back a few meters
  2. Increase the general lighting in the bay
  3. Hand the worker a dust mask
  4. Attach an exhaust extraction hose and route it outside Correct answer.

Explanation

Capturing exhaust at the source and routing it outdoors is an engineering control that removes the hazard before it reaches anyone. Distance, lighting, and a dust mask do not control the exposure effectively.

Question 19Apply safety practices and environmental protection in motorcycle/small engine servicing

A shop uses a solvent parts washer that has become visibly contaminated with metal sludge. What is the most appropriate handling?

  1. Filter the sludge through a cloth into the drain
  2. Let the sludge settle and pour the clear liquid outside
  3. Dump the sludge into the trash and refill with fresh solvent
  4. Have the solvent and sludge removed by a licensed waste contractor and document it Correct answer.

Explanation

Contaminated solvent and the metal-bearing sludge are hazardous waste that must be removed by a licensed contractor with proper documentation. Draining, filtering to a drain, or discarding in trash all release hazardous constituents into the environment.

Question 20Apply safety practices and environmental protection in motorcycle/small engine servicing

Which statement about the use of a fire extinguisher in a small engine shop is correct?

  1. A Class B extinguisher is appropriate for a fuel fire Correct answer.
  2. The extinguisher should be tested by discharging it monthly
  3. Any extinguisher works if aimed at the flames
  4. A water extinguisher is suitable for a gasoline fire

Explanation

Flammable liquid fires are Class B, so a Class B-rated extinguisher such as dry chemical or foam is required. Water spreads fuel fires, aiming at flames rather than the base is ineffective, and extinguishers are checked by inspection rather than monthly discharge.

Question 21Use hand tools, measuring instruments, and servicing equipment

When tightening a cylinder head bolt with a torque wrench, what does the click or release signal indicate?

  1. The socket is the wrong size for the fastener
  2. The bolt has started to strip its threads
  3. The set torque has been reached and tightening should stop Correct answer.
  4. The wrench needs to be recalibrated

Explanation

A click-type torque wrench signals audibly or by feel when the preset torque value is reached. Once that signal occurs the operator should stop applying force, because further turning exceeds the specified clamp load.

Question 22Use hand tools, measuring instruments, and servicing equipment

Which measuring instrument is most appropriate for checking the outside diameter of a valve stem to detect wear?

  1. Dial indicator on a magnetic base
  2. Feeler gauge
  3. Plastigauge strip
  4. Vernier caliper Correct answer.

Explanation

A vernier caliper or micrometer measures external diameters directly and can resolve small wear differences on a valve stem. Feeler gauges measure gaps, dial indicators measure runout or movement, and plastigauge measures bearing clearance.

Question 23Use hand tools, measuring instruments, and servicing equipment

What is the primary purpose of using a torque wrench instead of a standard ratchet when assembling engine fasteners?

  1. To speed up the assembly of many bolts
  2. To loosen overtightened bolts
  3. To apply a controlled clamping force specified by the manufacturer Correct answer.
  4. To avoid the need for a socket

Explanation

Torque wrenches control the rotational force applied so the fastener develops the clamp load the manufacturer specifies. Correct clamp load prevents joint failure, distortion, and loosening in service.

Question 24Use hand tools, measuring instruments, and servicing equipment

A feeler gauge is the correct tool for which of the following small-engine service tasks?

  1. Setting spark plug electrode gap Correct answer.
  2. Measuring crankshaft end play
  3. Checking connecting rod bearing oil clearance
  4. Measuring cylinder bore diameter

Explanation

Feeler gauge blades are inserted into a gap of known nominal size, making them ideal for setting or verifying the spark plug electrode gap. Bore diameter, bearing oil clearance, and end play require calipers, plastigauge, or a dial indicator respectively.

Question 25Use hand tools, measuring instruments, and servicing equipment

Before using a micrometer, the technician should verify that the instrument reads zero when the anvils are closed. What is this check called?

  1. Runout check
  2. Zeroing or calibration check Correct answer.
  3. Backlash adjustment
  4. Tolerance stacking

Explanation

Closing the anvils and confirming the thimble reads zero verifies the micrometer is set correctly before measurement. If it does not read zero, the instrument must be adjusted or recalibrated.

Question 26Use hand tools, measuring instruments, and servicing equipment

Which hand tool is designed to remove a snap ring from a small-engine gearbox shaft?

  1. Locking pliers
  2. Diagonal cutting pliers
  3. Needle-nose pliers
  4. Snap ring pliers Correct answer.

Explanation

Snap ring pliers have pins that engage the ring holes so the ring can be compressed or expanded for removal. Standard pliers do not grip the ring holes securely and can distort the ring.

Question 27Use hand tools, measuring instruments, and servicing equipment

A technician measures a cylinder bore with a telescoping gauge and then transfers the gauge to an outside micrometer. Why is this two-step method used?

  1. The telescoping gauge captures the bore size, which is then read with a micrometer Correct answer.
  2. The micrometer measures the bore directly and the gauge is only for alignment
  3. The micrometer alone cannot measure internal diameters accurately
  4. The telescoping gauge provides a digital readout

Explanation

A telescoping gauge is set to the bore diameter inside the cylinder, locked, and then measured with an outside micrometer. This indirect method allows an outside micrometer, which measures external dimensions, to determine an internal bore size.

Question 28Use hand tools, measuring instruments, and servicing equipment

When using a dial indicator to check crankshaft runout, where should the indicator plunger contact the shaft?

  1. On the rough cast surface of the counterweight
  2. On the crankcase surface beside the shaft
  3. On the finished journal surface, perpendicular to the shaft axis Correct answer.
  4. On the end of the shaft parallel to its axis

Explanation

Runout is measured by rotating the shaft with the plunger on a finished journal, perpendicular to the axis so radial movement is sensed. Measuring on a rough surface or parallel to the axis gives meaningless readings.

Question 29Use hand tools, measuring instruments, and servicing equipment

A torque wrench has been stored for months with its scale set at 80 N·m. What is the recommended practice before returning it to service?

  1. Oil the internal spring to restore its tension
  2. Have it calibrated or verified against a known standard before use Correct answer.
  3. Use it immediately since storage does not affect torque wrenches
  4. Set it to maximum torque and cycle it several times

Explanation

Spring-type torque wrenches can drift when stored under load, so the setting should be backed off after use and the tool verified before critical work. Calibration against a known standard confirms accuracy.

Question 30Use hand tools, measuring instruments, and servicing equipment

Which measuring instrument would a technician use to check the inside diameter of a small-engine cylinder bore directly?

  1. Torque wrench
  2. Bore gauge or inside micrometer Correct answer.
  3. Outside micrometer
  4. Feeler gauge

Explanation

A bore gauge or inside micrometer is designed to measure internal diameters directly within the cylinder. Outside micrometers measure external dimensions, while feeler gauges and torque wrenches serve unrelated purposes.

Question 31Use hand tools, measuring instruments, and servicing equipment

A technician is checking valve clearance on a small engine and finds the feeler gauge blade will not pass between the rocker and valve stem at the specified clearance. What does this indicate?

  1. The feeler gauge is the wrong tool for this check
  2. The clearance is larger than specified and is acceptable
  3. The clearance is smaller than specified and needs adjustment Correct answer.
  4. The engine is at the correct clearance

Explanation

If the specified blade does not fit, the actual gap is tighter than the specification and must be adjusted. A blade that slides with slight drag indicates the correct clearance.

Question 32Use hand tools, measuring instruments, and servicing equipment

What is the correct procedure for using a torque wrench in a sequence of cylinder head bolts?

  1. Follow the manufacturer's tightening sequence and torque in stages Correct answer.
  2. Tighten each bolt fully in any order
  3. Tighten the center bolts last
  4. Tighten all bolts to half torque and stop

Explanation

Cylinder head bolts must be tightened in the specified sequence and in stages to distribute clamp load evenly and avoid head distortion. Skipping the sequence or stages can cause gasket failure or warping.

Question 33Use hand tools, measuring instruments, and servicing equipment

A technician needs to remove a seized bolt from an aluminum crankcase. Which practice best reduces the risk of damaging the threads?

  1. Heat the bolt with a torch until it glows
  2. Apply penetrating oil, use a six-point socket, and apply steady force Correct answer.
  3. Use a twelve-point socket and force the bolt
  4. Use an impact wrench at maximum setting immediately

Explanation

Penetrating oil, a six-point socket that grips the flats fully, and steady force reduce the chance of rounding the bolt head or stripping threads in soft aluminum. Excessive impact force or overheating can cause damage.

Question 34Use hand tools, measuring instruments, and servicing equipment

When measuring a piston with an outside micrometer, why should the measurement be taken at a specified height from the skirt and at a right angle to the piston pin?

  1. The piston pin interferes with all other measurements
  2. Piston diameter varies with height and ovality, so the location must match the specification Correct answer.
  3. The micrometer only works at that location
  4. The measurement is only for appearance

Explanation

Pistons are machined with taper and ovality, so diameter differs by height and direction. Measuring at the manufacturer-specified location and orientation gives a value comparable to the service limit.

Question 35Use hand tools, measuring instruments, and servicing equipment

What is the purpose of a valve spring compressor in small-engine service?

  1. To compress the valve spring so the retainer and keepers can be removed Correct answer.
  2. To measure valve spring free length
  3. To torque the cylinder head
  4. To set valve clearance

Explanation

A valve spring compressor compresses the spring, relieving pressure on the retainer so the keepers can be removed and the valve disassembled. It does not measure spring length or set clearance.

Question 36Use hand tools, measuring instruments, and servicing equipment

A technician measures a bore with a telescoping gauge and obtains a reading of 65.02 mm, while the service limit is 65.00 mm. What is the correct interpretation?

  1. The measurement is invalid because telescoping gauges cannot resolve 0.02 mm
  2. The bore is within specification and can be reused
  3. The bore is undersized and needs honing to increase diameter
  4. The bore exceeds the service limit and requires reboring or replacement Correct answer.

Explanation

A measured bore larger than the service limit indicates wear beyond the allowable maximum. The cylinder must be rebored to an oversize or replaced, depending on the manufacturer's recommendations.

Question 37Use hand tools, measuring instruments, and servicing equipment

A torque wrench is dropped on the shop floor. What is the most appropriate action before using it on an engine assembly?

  1. Have it recalibrated and verified before use Correct answer.
  2. Increase the setting by ten percent to compensate
  3. Use it normally since torque wrenches are shock resistant
  4. Oil the mechanism and continue use

Explanation

A drop can disturb the internal spring and mechanism, causing inaccurate torque delivery. The wrench should be recalibrated and verified against a standard before being trusted for critical fasteners.

Question 38Use hand tools, measuring instruments, and servicing equipment

During a valve clearance check, the specified intake clearance is 0.15 mm. A 0.15 mm blade passes with slight drag, but a 0.20 mm blade also passes easily. What is the most likely conclusion?

  1. The engine is at the correct clearance and no action is needed
  2. The feeler gauge set is defective
  3. The clearance is greater than 0.15 mm and needs adjustment Correct answer.
  4. The clearance is exactly 0.15 mm

Explanation

If a thicker blade also passes easily, the actual gap exceeds the specified value. The clearance should be adjusted to bring it back within the manufacturer's tolerance.

Question 39Use hand tools, measuring instruments, and servicing equipment

A technician is choosing between a click-type and a beam-type torque wrench for a low-torque application such as a small-engine rocker cover bolt. Which consideration is most relevant?

  1. The wrench's rated range should bracket the target torque near its mid-range for accuracy Correct answer.
  2. The beam-type wrench is always more accurate at low torque
  3. The click-type wrench cannot be used below 50 N·m
  4. The choice does not matter because all torque wrenches are equally accurate

Explanation

Torque wrenches are most accurate in the middle of their rated range, so a wrench whose range brackets the target torque appropriately should be selected. Using a high-capacity wrench for a low-torque fastener reduces accuracy.

Question 40Use hand tools, measuring instruments, and servicing equipment

What is the correct storage practice for a click-type torque wrench after use?

  1. Set the scale to its lowest setting and store in a dry place Correct answer.
  2. Store at the last used torque setting
  3. Store with the handle clamped in a vise
  4. Store submerged in oil

Explanation

Backing the scale off to the lowest setting relieves spring load and helps preserve calibration. Dry storage prevents corrosion of the mechanism.

Question 41Perform preventive maintenance and periodic servicing of motorcycle/small engines

During a periodic service on a four-stroke motorcycle engine, which component's clearance is measured with a feeler gauge while the engine is cold, following the manufacturer's specification?

  1. Brake lever free play
  2. Clutch plate free play
  3. Drive chain slack
  4. Valve tappet clearance Correct answer.

Explanation

Valve tappet clearance is set with a feeler gauge between the cam lobe or rocker arm and the valve stem, usually with the engine cold and the piston at top dead center on the compression stroke. The specification comes from the service manual because too little clearance causes hard starting and burned valves.

Question 42Perform preventive maintenance and periodic servicing of motorcycle/small engines

A technician drains the engine oil from a small four-stroke engine and finds metallic particles and a strong burnt smell. What is the most appropriate next step before refilling?

  1. Top up with fresh oil and continue the periodic service
  2. Refill with a thicker oil grade to compensate
  3. Flush the engine with diesel and run it for ten minutes
  4. Inspect the oil strainer and filter screen for blockage and check for abnormal wear Correct answer.

Explanation

Metal particles and a burnt smell indicate excessive friction or component wear, so the oil strainer, centrifugal filter, and screen must be checked for blockage and the source of debris investigated. Simply refilling hides the fault and risks seizure.

Question 43Perform preventive maintenance and periodic servicing of motorcycle/small engines

What is the correct procedure when checking the drive chain slack on a motorcycle during periodic maintenance?

  1. Measure slack by pulling the chain away from the rear sprocket at the three o'clock position
  2. Measure slack at the tightest point with the rear wheel off the ground and the transmission in neutral Correct answer.
  3. Measure slack with the rider seated and the suspension fully compressed
  4. Measure slack only after the chain has been lubricated and is warm

Explanation

Chain slack is checked with the rear wheel raised, the transmission in neutral, and the chain rotated to find its tightest point, then compared with the manual specification. Measuring at the tightest point prevents over-tightening that damages bearings and seals.

Question 44Perform preventive maintenance and periodic servicing of motorcycle/small engines

Which maintenance task is performed on a maintenance-free (sealed) battery during a routine periodic service?

  1. Add sulfuric acid to restore the electrolyte
  2. Check terminal cleanliness, tightness, and charging voltage Correct answer.
  3. Remove the sealing caps and measure the specific gravity
  4. Check the electrolyte level and top up with distilled water

Explanation

A sealed maintenance-free battery cannot be opened for electrolyte service, so the technician checks terminal corrosion, mounting security, and charging voltage. Specific gravity measurement and water topping up apply only to conventional open-cell batteries.

Question 45Perform preventive maintenance and periodic servicing of motorcycle/small engines

After replacing the engine oil and filter on a small engine, why should the technician run the engine briefly and then recheck the oil level?

  1. To burn off residual assembly oil inside the combustion chamber
  2. To circulate oil, fill the new filter, and confirm there are no leaks before the final level check Correct answer.
  3. To seat the piston rings after the oil change
  4. To reset the oil change indicator light automatically

Explanation

Running the engine circulates oil into the new filter and oil galleries, and the level drops as passages fill. A short run also reveals leaks at the drain plug and filter before the machine is returned to the customer.

Question 46Perform preventive maintenance and periodic servicing of motorcycle/small engines

A motorcycle's front brake lever feels spongy after a periodic service. Which condition best explains this symptom?

  1. Low tyre pressure in the front wheel
  2. Air trapped in the hydraulic brake line Correct answer.
  3. Worn brake pad friction material
  4. Glazed brake disc surface

Explanation

A spongy lever means the hydraulic system is compressing air instead of fluid, so the system must be bled. Air enters through loose fittings, a damaged hose, or a low reservoir during servicing.

Question 47Perform preventive maintenance and periodic servicing of motorcycle/small engines

What is the primary purpose of adjusting the clutch cable free play on a motorcycle during periodic maintenance?

  1. To increase engine power output
  2. To ensure the clutch fully engages and disengages without slipping or dragging Correct answer.
  3. To shorten the clutch lever travel for comfort
  4. To reduce the noise of the gearbox in neutral

Explanation

Correct free play lets the clutch plates fully engage when the lever is released and fully separate when it is pulled. Too little free play causes slipping and rapid wear, while too much causes dragging and difficult gear selection.

Question 48Perform preventive maintenance and periodic servicing of motorcycle/small engines

During a periodic service, the spark plug electrode is found heavily fouled with black soot and the gap is worn beyond specification. What is the recommended action?

  1. Sand the electrode and reuse the plug without checking the gap
  2. Replace the spark plug with one of the correct heat range and gap Correct answer.
  3. Clean the plug and regap it to a wider setting than specified
  4. Increase the gap to compensate for the fouling

Explanation

A plug that is heavily fouled and worn past its gap limit should be replaced with the specified heat range and pre-gapped type. Reusing a worn plug risks misfire, hard starting, and poor fuel economy.

Question 49Perform preventive maintenance and periodic servicing of motorcycle/small engines

Which condition indicates that the air filter element of a motorcycle should be cleaned or replaced during periodic maintenance?

  1. The element has been in service for one week
  2. The element is lightly dusted with fine particles on the outer surface
  3. The element is clogged with dirt, oil-soaked, or torn Correct answer.
  4. The element is a foam type rather than a paper type

Explanation

A filter that is clogged, oil-saturated, or torn restricts airflow or lets dirt into the engine and must be serviced or replaced. Light surface dust on the outer face is normal and can be cleaned according to the manual.

Question 50Perform preventive maintenance and periodic servicing of motorcycle/small engines

A four-stroke engine's oil level is checked with the motorcycle on its center stand on level ground. The dipstick reads above the upper mark. What is the correct action?

  1. Leave it, since more oil gives better protection
  2. Run the engine hard to burn off the excess oil
  3. Add a little more oil to reach the top of the filler neck
  4. Drain the excess oil until the level is between the marks Correct answer.

Explanation

Overfilling causes foaming, seal leakage, and crankcase pressure that can force oil into the airbox. The excess should be drained so the level sits between the lower and upper marks.