This post was Last updated on : 01/14/2020
Before “starting”, make sure you are not ignoring most basic things. Because sometimes we forget simple things.
- Fuel is available in tank & holding left brake lever while pressing start switch.
- Engine oil – No engine oil(even a small leak will drain whole engine oil in a period of few months), oil filled more than needed, less oil, dark brown or black colored engine oil etc are common reasons of trouble in bikes.
Ultimate guide to troubleshooting and repairing a motor scooter that won’t start.
When kick starting, if you only hear sound of mechanical parts moving, it means No ignition is there. Sound of mechanical parts moving only means there is no explosion sound.
Scooter not starting and no sign of ignition is normal in cold whether.
- Case 1 – Only mechanical parts moving sound. This sound will be similar to when we try to kick without turning on the key. Engine crankshaft & other parts are moving, but no ignition.
- Case 2 – One or two powerstroke sound and stopping. This sound can be identified as Deep “Teih, Teih” sound.
Case 1 – Sound Sample – No ignition while kick starting.
Case 2 – Sound sample – Engine starts but suddenly shuts off.
It is a little bit difficult to differentiate this sound when starting with a starter motor. But even with starter motor sound, explosive sound of engine starting can be easily identified.
First 3 things what mechanics check when a motor scooter is not starting are Fuel, Engine oil & spark(Spark plug).
Scooter not starting – troubleshooting step by step
Case 1- No ignition while kick starting.
Step 1 – Common reason for ignition system not working is spark plug. So remove spark plug from engine & inspect it.
Step 2 – If spark plug is in good condition, check battery. If brake light is not turning on, battery is dead. While some scooters will start and run even without a battery, some ignition system will not work without a battery. If this is the case, try jump starting it.
Step 3 – Ignition coil in another important part of ignition system. Ignition coil is what provide very high voltage to spark plug.
Step 4 – CDI unit is the brain of ignition system in most low end motor scooters. There is 2 types of CDI systems, AC cdi & DC cdi.
Step 5 – Regulator & rectifier is another part part of ignition system in scooters, but these parts rarely get defective.
step 6 – Check for Starter relay problems.
Step 7 – Magnetic coil in engine, create current for charging battery and also for lights.
Case 2 – Engine starts but suddenly shuts off.
Step 1 – In this case also, remove spark plug from engine and inspect it. Clean or replace it.
Step 2 – Make sure engine oil is in good condition & right amount.
Step 3 – Clean and tune carburetor.
Step 4 – Recharge or replace battery if dead
Step 5 – Check engine compression.
Step 6 – Clean / replace air filter.
Step 7 – Engine spark timing problems.