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newSchoolWorks.com › VoTechWorks › Transportation › Small Engine & Power Equipment › Motorcycle & ATV Basics › Lesson 7
TRN-SMAL74-06 · Lesson 7 · 10 clock hours · field

Pre-Delivery Inspection (PDI) & Service Documentation

Objective. Students will complete a full pre-delivery inspection on an assigned motorcycle or ATV using a manufacturer-style PDI checklist, correct any identified service items within their skill level, and produce a completed service work order ready for customer signature.

⚠ Pending professional review

This lesson, its worked examples and its practice questions has not yet been verified by a certified examiner or master technician in the trade or by a certification or approval body. It is a study draft and may contain errors. Do not use it as instructions for work on a job site or on live equipment. Always follow your instructor, your supervising professional, and current official references and regulations.

VoTechWorks program approval and accreditation are still in progress. Credentials are issued only by the certifying bodies named in each program, after their own exams.

Why the PDI Matters

A Pre-Delivery Inspection (PDI) is the final quality gate between the factory and the customer. Motorcycles and ATVs ship assembled but not road-ready: fasteners may have loosened in transit, fluids may be low, and protective shipping materials must be removed. A missed defect on a PDI can cause a warranty dispute, a liability claim, or — most seriously — a crash. As the technician performing the PDI, your signature on the work order certifies the machine is safe and meets OEM specifications. Take that responsibility seriously.

Safety First

Before you touch any machine, conduct a walk-around to spot obvious hazards: fuel leaks, damaged brake lines, or unstable positioning on the lift or stand. Wear safety glasses throughout. Keep the work area clear of trip hazards. When checking the brake system or fuel system, be aware of ignition sources — no open flames, no sparks from metal-on-metal contact near the fuel tank. If the engine must be run for idle-speed adjustment or warm-up checks, use the shop ventilation system or run the unit outdoors; carbon monoxide accumulates quickly in enclosed spaces. For ATV PDIs, chock the wheels before releasing the parking brake or running the engine. Never place any part of your body in the path of moving drivetrain components.

The PDI Checklist: A System, Not a Shortcut

Manufacturer PDI checklists are organized by system so nothing is skipped. Work methodically from one system to the next. Common sections include:

Do not mark an item "passed" until you have physically verified it. Checking a box from memory is one of the most common sources of PDI errors in the field.

Identifying Defects

Seeded defects in a training PDI represent real-world shipping or assembly errors. Here is how to approach each common defect type:

Low tire pressure: Use a calibrated gauge. Compare the reading to the pressure label on the sidewall or the OEM specification in the owner's manual — the two may differ, and the OEM spec takes priority. Inflate to specification, then re-check; tire gauges can release a small amount of air when removed.

Loose axle nut: Use the correct size socket and a torque wrench. Look up the torque specification in the OEM service manual for that exact model — axle nut torque varies widely by design. A cotter pin or safety clip must be reinstalled after final torquing if the design requires it.

Dirty air filter: Remove, inspect, and service per OEM procedure. A paper element is typically replaced if heavily contaminated; a foam element may be cleaned and re-oiled according to OEM instructions. Never blow compressed air from the inside out on a paper element that will be reused — this forces dirt deeper into the fibers.

Low brake fluid: Identify the correct fluid type from the reservoir cap or OEM manual — most motorcycle systems specify DOT 4, but always confirm. Add fluid to the MAX mark. Inspect the reservoir diaphragm and seal before closing. Low fluid can indicate pad wear or a leak; inspect pads and lines before closing the work order.

Incorrect idle speed: Connect a tachometer to the spark plug wire or use the shop's optical/inductive tach. Warm the engine fully before adjusting idle — cold idle readings are not accurate for this check. Turn the idle speed screw in small increments and allow the engine to stabilize before reading. Compare to OEM specification.

Using the Service Manual

The service manual is not optional reading — it is a precision tool. For any specification (torque, clearance, fluid type, idle RPM), go to the model-specific section. Specifications carry over between similar models but are not always identical. Record the manual reference (section and page or figure number) on the work order so the next technician can verify your source.

Completing the Service Work Order

A service work order is a legal document. Every field must be filled in:

Leave no field blank. Write "N/A" if a field truly does not apply. Incomplete work orders are rejected in real shops and can create liability exposure.

The Verbal Defense

Presenting your work to the instructor mirrors explaining a repair to a service advisor or customer. Be prepared to state what you found, how you measured it, what specification it had to meet, what you did to correct it, and how you confirmed the correction. If you cannot explain the rationale, the repair is not complete in a professional sense even if the wrench work is correct.

Key terms9

Pre-Delivery Inspection (PDI)A structured, checklist-driven inspection performed on a new or transferred unit before it is delivered to the customer, verifying that the machine meets all OEM safety and performance specifications.
OEM SpecificationA value — such as a torque setting, fluid level, or idle speed — published by the original equipment manufacturer for a specific model; the authoritative standard for all PDI and service decisions.
Service Work OrderA formal document recording customer and unit information, faults found, corrective actions taken, parts used, and technician sign-off; serves as a legal record of the service performed.
Torque SpecificationThe OEM-prescribed tightening force for a fastener, expressed in foot-pounds (ft-lb) or Newton-meters (N·m), verified with a calibrated torque wrench.
Idle SpeedThe engine RPM when the throttle is fully closed and the engine is at normal operating temperature; adjusted at the idle speed screw and verified with a tachometer against OEM specification.
Brake Fluid SpecificationThe glycol-ether or borate ester formulation (e.g., DOT 4) required for a specific brake system, marked on the reservoir cap and in the service manual; mixing incompatible fluids can degrade braking performance.
Cotter PinA split-pin safety device inserted through a castellated nut and a drilled fastener to prevent loosening; must be replaced with a new pin whenever the nut is removed and re-torqued.
TachometerAn instrument that measures engine speed in revolutions per minute (RPM); used to set and verify idle speed during a PDI.
VIN (Vehicle Identification Number)The standardized alphanumeric serial number unique to each vehicle; recorded on the work order to tie all service documentation to the specific unit.

Worked examples4

1. Your tire gauge reads 18 psi in the rear tire of an ATV. The OEM service manual specifies 22 psi rear. How much pressure must you add, and after inflating to 23 psi and releasing the gauge (which vents 1 psi), what is the final reading?
  1. Determine the deficit: 22 psi (required) − 18 psi (measured) = 4 psi needed.
  2. Inflate to 1 psi above target to account for gauge venting: target 22 psi + 1 psi = inflate to 23 psi on the gauge while filling.
  3. Remove gauge; 1 psi vents: 23 psi − 1 psi = 22 psi final pressure.
  4. Re-check with gauge to confirm 22 psi; record reading and OEM spec on work order.
Answer: You must add 4 psi. After venting the gauge, the final tire pressure is 22 psi, matching OEM specification.
2. The OEM service manual states rear axle nut torque is 85 ft-lb. Your torque wrench is set to 85 ft-lb but you realize it is calibrated in Newton-meters and the display reads in N·m. Convert 85 ft-lb to N·m (use the conversion: 1 ft-lb = 1.356 N·m).
  1. Identify the conversion factor: 1 ft-lb = 1.356 N·m.
  2. Multiply: 85 ft-lb × 1.356 N·m/ft-lb = 115.26 N·m.
  3. Round to the nearest whole number for practical use: 115 N·m.
  4. Set the torque wrench to 115 N·m, torque the axle nut, and record both values on the work order.
Answer: 85 ft-lb is approximately 115 N·m. Set the torque wrench to 115 N·m.
3. The OEM idle speed specification is 1,400 ± 100 RPM (acceptable range 1,300–1,500 RPM). Your tachometer reads 1,650 RPM on a warm engine. By how many RPM is the idle out of specification, and which direction must you turn the idle speed screw?
  1. Identify the upper limit of the acceptable range: 1,500 RPM.
  2. Calculate the excess: 1,650 RPM − 1,500 RPM = 150 RPM too high.
  3. To reduce idle speed, turn the idle speed screw counterclockwise (out) in small increments.
  4. Allow the engine to stabilize after each adjustment; re-read the tachometer until the reading falls within 1,300–1,500 RPM, then record the final RPM on the work order.
Answer: The idle is 150 RPM above the upper limit. Turn the idle speed screw counterclockwise to reduce speed into the 1,300–1,500 RPM range.
4. You used 0.05 liters of brake fluid to bring the reservoir from MIN to MAX. The shop charges for brake fluid in 0.1-liter increments at a minimum. What quantity do you record on the work order parts line?
  1. Determine actual quantity used: 0.05 liters.
  2. Apply the shop billing rule: minimum charge increment is 0.1 liter.
  3. Since 0.05 liters is less than one full increment of 0.1 liter, bill the minimum: 0.1 liter.
  4. Record on the work order: Brake fluid (DOT 4, or per OEM spec) — 0.1 liter, along with part number if applicable.
Answer: Record 0.1 liter of brake fluid on the work order parts line (minimum billing increment).

The math in this lesson1

Learners compute a 4 psi tire-pressure deficit and over-inflate 1 psi to allow for gauge venting.
7.EE.3
In class: Each student is assigned an unprepared training unit with several seeded defects (low tire pressure, loose axle nut, dirty air filter, low brake fluid, incorrect idle speed); the student works independently through a full PDI checklist, identifying all faults without instructor prompting. · Students correct each fault they identify using skills from lessons 1–6, referencing service manuals as needed, and re-inspect each corrected item before marking it passed on the checklist. · Students transfer all findings, parts used, labor description, and corrective actions to a professional service work order form, then present their completed unit and documentation to the instructor in a 5-minute verbal defense explaining what was found and why each correction was made.
Materials: Assigned motorcycle or ATV training unit with seeded defects, full tool kit (hand tools, torque wrench, multimeter, tachometer), tire-pressure gauge, PDI checklist form, service work order forms, OEM service manuals
Check: Student identifies at least 80% of seeded defects independently; all identified defects are corrected to OEM specification confirmed by instructor re-inspection; service work order is complete with no missing fields; verbal defense demonstrates correct rationale for at least 80% of findings. All four criteria required for pass.

Practice check8

Answer each question, then check it. Nothing is recorded; this is your own practice.

Service and Inspection Procedures
1. A technician marks a PDI checklist item 'passed' based on memory without physically measuring the tire pressure. What is the primary risk of this practice?
Braking Systems
2. During a PDI you find brake fluid at the MIN mark. Before adding fluid, what additional inspection step should you perform?
Engine Systems and Tune-Up
3. Which instrument is used to verify engine idle speed during a PDI?
Fasteners and Torque Procedures
4. An ATV axle nut calls for a cotter pin after torquing. The old cotter pin was bent and removed during the PDI. What is the correct next step?
Air Induction and Fuel Systems
5. When cleaning a foam air filter element during a PDI, which action is correct?
Service Documentation and Work Orders
6. A student's work order lists the defects found and the corrective actions taken but leaves the VIN field blank. Why is this a problem in a professional shop?
Engine Systems and Tune-Up
7. The OEM idle specification is 1,500 ± 100 RPM. A warm engine reads 1,420 RPM on a calibrated tachometer. What is the correct action?
Shop Safety and Hazard Identification
8. What is the primary reason a technician must run an engine in a ventilated area or outdoors during a PDI idle-speed check?
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