310G Motorcycle Technician Practice Quiz
Free · 161 Questions.

• Worn or damaged wheel bearings that need replacement
• Loose fork-tube pinch bolts that allow slight leg movement
• A rim with excessive radial run-out that needs spoke truing
• Steering head bearings that have lost their preload setting

Why: Gritty rotation plus play at the rim with the axle tight points to wheel bearings with excessive wear or damage, which Ont. Reg. 611 treats as a defect found by rotating the wheel. Radial run-out makes a wheel hop, not a gritty drag. Pinch bolts and steering head bearings would show movement in the forks or steering, not at the rim itself.

• Check the wheel bearings and axle seating, since play inflates the reading
• Replace both front pads, since pad glazing creates the same reading on the gauge
• Bleed the brakes, since air in the line is a common cause of a pulsing lever
• Fit a thicker pad set, since the extra material takes up the run-out

Why: Rotor run-out measured on the bike includes any wheel bearing play or axle misseating, so the tech first eliminates those and re-measures. Only a reading that stays out of limits after that is blamed on the rotor, hub or rotor bolts. Air in the lines makes a spongy lever instead of a pulsing one, and pad thickness cannot correct a measured run-out.

• Fails, because the beam is 120 mm high, over the 100 mm limit
• Passes, because both measurements are inside the limits
• Fails, because the 150 mm left offset is over the limit
• Fails, because both the vertical and horizontal limits are exceeded

Why: Schedule 6 s.6(3) allows the beam centre to sit no more than 100 mm above or below, and no more than 200 mm left or right, of the lamp centre-line at 8 m. The beam is 120 mm high, which is out of limit, while 150 mm sideways is within the 200 mm allowance.

• Clearance is 0.045 mm, above the specification, so the piston or cylinder needs service
• Clearance is 0.045 mm, which is acceptable because it is above the 0.020 mm minimum figure
• Clearance is 0.025 mm, which is within the specification, so no service is needed
• Clearance is 0.095 mm, far beyond the limit, so the cylinder needs boring

Why: Clearance is bore diameter minus piston diameter: 66.020 - 65.975 = 0.045 mm, which is 0.005 mm over the 0.040 mm upper limit. The range is a window, not a minimum, so the engine needs a new piston or cylinder work such as boring to an oversize piston.

• They cannot release crankcase emissions, so the breather stays plumbed to the intake
• They need to meet exhaust limits, but crankcase venting falls outside the regulation
• They can vent the crankcase if the bike is in Class I, under 170 cm³ of displacement
• They can vent the crankcase as long as the exhaust passes an emissions test

Why: Section 17 requires motorcycles to conform to the applicable exhaust and evaporative emission standards and states that they shall not release any crankcase emissions. The breather therefore stays connected to the intake, regardless of engine size or exhaust results.