Core Units: Safety, Tools, Measurement and Engines
What the core units cover
Core units test the knowledge every motorcycle technician needs before touching a customer machine: workplace health and safety, environmental duty of care, hand and power tool use, precision measurement, and basic four-stroke engine theory. Expect questions on isolation of stored energy, correct lifting, personal protective equipment, waste segregation, and the safe use of lifting equipment and stands.
Concepts you must know
Understand the hierarchy of hazard control and be able to name common workshop hazards: exhaust gas, fuel vapour, hot surfaces, rotating parts, battery acid, and compressed springs in suspension. Know the four-stroke cycle (induction, compression, power, exhaust) and valve timing basics. Know why torque settings and sequences matter, and how to read a micrometer, vernier caliper, and feeler gauge correctly, including zero error.
Traps in questions
- Confusing torque wrench types: click, beam, and digital; know that a torque wrench is for final tightening, not loosening.
- Mixing up clearances: valve clearance is measured cold unless the manual states otherwise.
- Assuming a battery is isolated when the ignition is off; the earth lead should be disconnected first.
- Confusing hazardous waste streams: waste oil, solvent, and coolant are segregated.
Worked rule of thumb
When reading a metric micrometer, add the barrel reading to the thimble reading. Barrel shows 5.50 mm and thimble line 24 aligns, so 5.50 + (24 x 0.01) = 5.74 mm. Always close the jaws on the object, not on air, and check zero before measuring.
Study approach
Practise measurement on scrap components, rehearse a pre-start check, and be able to explain the reason behind each safety step, not just the step itself.