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!



Spark Plug

The spark plug that came as standard with your imported Chinese 50cc scooter GY6 clone is likely to be of poor quality, and is likely to provide a weak, unreliable spark. The spark plug creates a spark that ignites the air fuel mix, all motorbikes, scooters and mopeds have one, including cheap chinese and taiwanese 50cc clones.

How to Change The Spark Plug, Chinese GY6 Scooters

Applies to: Baotian, Sukida, Hoatian, Lifan, JMStar, Jinlun, Kymco, Tank, Quinqzi, PGO, Roketa, Strada and Taishan QingQi and many more...

Checking and changing your chinese 4 stroke scooters Spark Plug

Changing the spark plug on your scooter is not a difficult task. Some scooters may have bodywork or fittings that impede access, if not all you need is a ratchet wrench and a spark plug socket.

It is important to buy the correct type of spark plug for your 139QMB moped otherwise the plug may run too hot or too cold. This will effect the performance of your scooter and the life span of the spark plug. The correct spark plug for most Chinese imported 50cc scooters is an NGK C7HSA.


  1. Place your motorbike on its center stand. In these pictures I have removed some bodywork for camera access, this is not necessary. The spark plug is recessed into the side of the engine.
  2. Pull the High Tension Lead (HT Lead) from the top of the spark plug.

    Pull the HT Lead of the spark plug chinese scooter
  3. You will now be able to fit your spark plug socket onto the spark plug. Use a ratchet spanner to undo the plug from the scooters engine block.

    TIP: Turn anti-clockwise to undo the spark plug.

    GY6 Chinese Scooter Clone Undoing Spark Plug
  4. Remove the old spark plug and inspect it. This can give you a good indication of how the engine is running. See NGKs Spark Plug Guide for more detail.
  5. Check the spark plug gap on your new sparkplugs electrode. About 0.6mm is about right. chinese qmb139 scooter Spark Plug Gap
  6. Fit the new plug into your scooters engine, tighten with the ratchet wrench and remember to push the HT lead back onto the spark plug. NOTE: DO NOT OVER TIGHTEN THE SPARK PLUG! The cylinder head is made of alloy which is soft and the thread can strip easily.











Notes

If your Chinese 50cc 4 stroke scooter is getting difficult to start, down on power or struggles to run properly, change the spark plug. You should also consider changing the ignition coil and HT Lead at the same time as these can also produce the same symtoms.

Other manufacturers, ie Champion and Autolite also produce suitable spark plugs for chines 4 stroke scooters and motorbikes.



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