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



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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!



Camshaft Removal Overview

There are many reasons why you may need to remove the camshaft from your chinese import scooter. You may need to adjust the valves or perhaps you want to fit a high performance camshaft. If your 50cc scooter has a high mileage it is possible that the camshaft may be worn and need replacing. Once the camshaft is removed you will be able to inspect the camshaft lobes for wear and measure to see if they are worn.

Steps to Remove Camshaft from Cylinder Head

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

Camshaft Removal

The steps outlined below walk you through removing the camshaft from your Chinese import scooters engine. It appears complex, but don't be put off . Simply follow the instructions through step by step and you will get there! Depending upon your scooter model you may have to remove some body panels and other anciliary devices from your scooter to gain access to the cylinder head. If so, simply refer to the relevant chapter in this manual.


  1. Remove the seat and luggage box to reveal the top of the engine. (refer to relevant section)
  2. Undo the four bolts that secure the camshaft cover to the cylinder head.
  3. Now you need to set the engine to TDC (Top Dead Center). Rotate the engine using the kick start lever until the mark on the camshaft sprocket lines up with the cylinder head. Confirm that the hole in the camshaft sprocket is at the top. If it isn't, rotate the engine one full rotation.
  4. Remove the four nuts that secure the camshaft caps. Note: These four bolts also hold the entire cylinder head together so take care not to dislodge the cylinder head.
  5. You should now be able to remove the camshaft from the cylinder head be taking the chain off the camshaft sprocket.
  6. Inspect camshaft and bearing for wear or damage and replace if necessary.
  7. NOTE: If fitting a high performance camshaft to your 50cc 4 stroke chinese import scooter, you may need to fit stiffer valve springs at the same time.
  8. Refitting is the reverse procedure. Be extremely carefull to ensure you have set the engine timing correctly to avoid damage to the valves and pistons.
Undo the four camshaft cover bolts from th chinese import scooter moped
Setting your scooter engine to Top Dead Center.






Notes

Typically the camshaft, even on a cheap import scooter, should last many miles unless the engine has been poorly maintained. Symptoms of a worn camshaft or camshaft followers are low power output, ticking noise from the top of the engine.

If the camshaft is badly worn, you should inspect all other moving parts in the cylinder head carefully for wear as well. If your engine is burning oil, it may be advisable to replace the valve stem seals at the same time.



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