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!



Engine Removal Overview?

Removing the engine from a 50cc four stroke chinese import scooter is not as hard as it may at first seem. You will find that unlike many larger motorcycles, the engine and transmission on a 139QMB style chinese scooter form one piece and will come out in one piece. Basically you are going to need to remove the rear wheel, rear suspension any electrical or fluid connections and then just the bolts that hold the engine assembly to the chassis, easy!

Steps to Remove Engine From Chinese Scooter

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

Engine Removal

Follow the steps below to remove the engine from your Chinese import scooter motorcycle. Work in a structured manor and complete each step before moving onto the next one. You may have to refer to other chapters in this online manual to complete some of the steps.


  1. Disconnect the battery to prevent accidental shock.
  2. Remove the body panels from around the engine (refer to relevant section).
  3. Disconnect the motorcycle engine earth cable.
  4. Disconnect the spark plug cable.
  5. Unplug the Autochoke connector.
  6. Disconnect the connectors to the Magneto and Starter Motor.
  7. Separate the fuel line and inlet pipe from the carburetor.
  8. Disconnect the throttle cable.
  9. Completely remove the Air Filter.
  10. Separate the brake cable from the brake control arm on the rear hub.
  11. Remove the rear Shock Absorber.
  12. Undo and withdraw the main engine mounting bolt.
  13. Lift and support the front of the scooter temporarily.
  14. Remove your import scooters side stand and spring mechanism.
  15. Now undo and remove the front engine mounting bolts.
  16. You should now be able to separate the engine assembly from the scooters chassis.
  17. Simply reverse these instructions to reinstall the engine.
Removing the various connections from the scooter carburetor
Undo the main engine mounting from your import scooter.






Notes

These instructions will be suitable for many of the imported 4 stroke scooters on the road today, there may be some variations between models, but don't panic, just work slowly and carefully and you will get there!

Many jobs are the same for all generic GY6 style mopeds, once you have fixed one you will find that you can work on another model fairly easily.



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