Index
Overview
Tuning
Tuning Overview
Lighter Roller Weights
Remove Variator Restrictor
Stiffer Clutch Springs
Move Needle Jet Washer
Increase Fuel Jet Size
Carb De-restriction
Un-Restricted CDI Unit
Un-Restricted Air Inlet
Trouble Shooting
Compression Test
Fuel Enricher Test
Seized Brake Caliper
General Maintenance
Replace Air Filter
Check & Change Oil
Spark Plug Change
Idle Speed Adjust
Change Brake Pads
Adjust Valve Lash
Electrical
Testing the Battery & Charging System
Battery Change
Coil Change
HT Lead Change
Transmission
Remove Starter Motor
Refurb Bendix Gear
Engine
Camshaft Removal
Valve Removal
Replace Valve Guides
Engine Removal
Return to Transport Listings
Models Covered
Lexmoto, Pulse, Sukida, Baotion, Lifan, Direct Bikes, Huatian, JMStar, QT50, LF50QT, YH50QT,
BT49qt, 139 QMB, Honda, GY6, Motorbike, Taishan, Jonway, Peugeot V-Clic, QT-4, QT-7, QT-9, qt-11, QT-50
Kymco, Tank, Quinqzi, PGO, Roketa, Strada, Vento, Yamati, QMB139, SunL, SYM, QingQi, Volano Plus Many More Chinese Motorcycles, mopeds and
scooters!
What is a Magneto?
Almost all gas powered vehicles, including motorcycles, scooters and mopeds
require electric power for starting, lights and running the high voltage spark plug system.
In the old days they used to use a dynamo, newer cars use an alternator (which produces AC current that has to be converted to DC current) however
motorbikes and scooters (Including Chinese Imports) tend to use a magneto which attaches directly to the end of the crankshaft.
The magneto produces pulses of voltage suitable for running a simple spark plug petrol engine.
For other electrical devices on the motorbike, a rectifier is used to smooth the voltage pulses.
How To Test For A Flat Battery Or Failing Charging System In Your 50cc Scooter
Applies to: Baotian, Sukida, Hoatian, Lifan, JMStar, Jinlun, Kymco, Tank, Quinqzi, PGO, Roketa, Strada QingQi and many more...
50cc chinese clone scooters, motorcycles and mopeds, like those imported from China, run a fairly simple 12v electrical system. It is not difficult to fault find the battery and charging magneto to try and pinpoint any problems.
If you are having problems with starting your import chinese scooter, the battery discharging or electrical fittings not operating then follow these steps to see if the problem lies with the battery or charging system.
Typically the battery will be located in a compartment beneath your feet as you are sitting on the scooter. Access is relatively simple, you will need a few basic tools to gain access and remove the battery.
For instructions on gaining access to the battery compartment, see the Changing Your Scooters Battery page.
How to test for charge from the Magneto
The Magneto is a device that is attached to the engine and as the engine on the scooter turns
it inturn rotates the magneto producing electricity. If the magneto fails, or becomes disconneted from the battery then your scooter
battery will go flat quickly. Test if your battery is receiving charge by following these steps.
- Once you have gained access to the battery compartment on your 50cc scooter (leave the battery terminals connected) attach a voltmeter to the battery terminals.
- Switch on the engine on your Chinese import scooter so it is idling.
- Select a suitable voltage range on your voltmeter and measure the voltage at the battery terminals.
- You should expect to see around 13v, or maybe a little more. This would indicate that the battery is receiving charge from the magneto.
- If you see less than 13v then there is likely a problem with the magneto or its connection to the battery as the battery is not being properly charged.
Checking That The Battery Is Fully Charged.
If the Magneto appears to be producing a suitable charging voltage to the battery on your 50cc scooter, next it is a good idea to check the actual voltage
that the battery is holding. Follow these steps.
- Gain access to the battery compartment.
- Leave the engine on your scooter switched OFF.
- Select a suitable voltage range on your voltmeter and measure the voltage at the battery terminals.
- You should expect to see around 12.2v to 13v. This suggests that the battery is holding a good charge.
- If you see less than 12v then it is possible that the battery is failing and will need to be replaced.
Notes
This page should help you to diagnose problems with your chinese import scooter but remember to check for obvious things. Firstly, check that you are not leaving the lights on your 50cc scooter switched on, or the ignition in the on position. Both of these things can lead to a flat battery.