Motorcycle engine fix

47 topics across 6 chapters

Chapter 1

Safety, tools, and service information

Shop safety: fire, fuel handling, ventilation, and PPE

Basic hand tools and motorcycle-specific tools (JIS, feeler gauges, torque wrench)

Service manual literacy: specs, torque charts, exploded diagrams

Fasteners and thread care: torque, threadlocker, anti-seize, helicoils

Fluids and consumables: oil, coolant, brake cleaner, gasket makers

Lifting and securing the bike: stands, tie-downs, stability checks

Chapter 2

How motorcycle engines work (essentials)

Four-stroke vs two-stroke fundamentals (cycles, ports/valves)

Compression, combustion, and volumetric efficiency (practical view)

Fuel metering basics: carb jets vs EFI injectors

Ignition basics: timing, spark energy, coils, plugs

Lubrication and cooling basics (oil pressure, coolant flow)

Chapter 3

Diagnose the problem (structured troubleshooting)

Symptom-driven triage: no-start, hard-start, stall, misfire, smoke, noises

Quick checks: fuel, spark, compression (FSCS workflow)

Reading spark plugs and exhaust smoke for clues

Vacuum/air leak testing and intake boots inspection

Engine noise diagnosis: top end vs bottom end vs clutch/primary

Overheat diagnosis: cooling system, lean running, timing, airflow

Chapter 4

Fuel & air system fixes

Carburetor cleaning and rebuild (float height, jets, diaphragms)

Air filter, intake tract, and throttle body inspection/cleaning

Fuel tank and petcock issues: rust, debris, venting, vacuum petcocks

Fuel pump and fuel pressure regulator diagnosis

Idle and mixture adjustment: pilot circuits, idle air control, sync basics

1 subtopics

Carb synchronization / throttle body synchronization (when and how)

Chapter 5

Ignition & electrical fixes

Battery and charging system: test battery, stator, regulator/rectifier

Starting system: starter relay, starter motor, sprag/one-way clutch clues

Ignition tune-up: plugs, caps, coils, leads, ignition timing checks

1 subtopics

Finding intermittent spark: heat soak, coil resistance, pickup/CKP checks

Wiring and connectors: grounds, corrosion, voltage drop testing

Chapter 6

Engine mechanical fixes and reassembly

Top-end service: valve clearance, cam timing checks, head gasket symptoms

4 subtopics

Valve clearance check and adjustment (shim-under-bucket and screw/locknut)

Cam timing verification (timing marks, chain tensioner, skipped-tooth symptoms)

How to run a compression test (tools, procedure, dry vs wet)

How to run a leak-down test (setup, TDC, listening for leak paths)

Bottom-end red flags: rod knock, crank issues, oil pressure problems

Clutch and primary drive issues that feel like engine problems

Oil leaks and sealing: gaskets, O-rings, seals, case halves

Cooling system repairs: thermostat, radiator, hoses, water pump, bleeding

Reassembly discipline: clean mating surfaces, torque sequence, timing marks

Post-repair checks: heat cycles, leak checks, plug read, re-torque (as required)