Engine Blocks GY6 50cc (139QMB)

Our GY6 50cc (139QMB) engine blocks are primarily designed for Chinese scooters using this engine type. We offer various versions for 10 inch and 12 inch wheels, carburettor or injection, and with a short or long rear axle.

Compatibility with non-Chinese brands

Installing this engine block on scooters from non-Chinese brands (such as Peugeot, Kymco, SYM, etc.) may require additional adjustments. Please note:

• The exhaust may no longer fit properly.
• The ignition system is often not directly compatible.
• Wiring connectors may differ from the connectors on the ignition.

Important considerations

• The engine blocks are unrestricted. After installation, the scooter can reach approximately 65 km/h.
• Even for Chinese scooters, 100% compatibility cannot be guaranteed.
• There are several types of speed limiters used on (Chinese) scooters, including:
  • Limitation via the CDI or ECU.
  • Limitation via a sensor near the clutch housing.
  • Limitation via a ring in the variator.
• Replacing an engine block is often plug & play, but not always.
• Make sure you have sufficient technical knowledge for installation and connection.

Disclaimer

Always check carefully before purchase and installation whether the engine block is suitable for your scooter. As a seller, we cannot take responsibility for any modifications required or for possible compatibility issues (such as mismatched connectors, ignition systems, or limiters). You are personally responsible for correct installation and compliance with applicable laws and regulations.

In the event of a faulty engine, it is often not unwise to completely replace the engine instead of overhauling it.

When do you replace the GY6 139QMB short axle 12" engine block?

If something crashes in your engine block (at higher revs, for example), a lot of things can go wrong. ● Gears crash or break ● Certain parts no longer receive an oil supply, run dry and break ● Bearings break or become trapped ● The above also applies to seals ● Your crankshaft bearings, or one of them, breaks And so on... What goes wrong at such a bad moment is too much to mention. It often comes down to a huge bill with your mechanic. But what you could also do once you add up all the costs might be to buy a completely new engine block! It happens that this is cheaper than replacing everything separately.

Properties of the GY6 139QMB complete 12" short axle engine block

● New engine with new parts ● Suitable to replace the old GY6 139QMB engine ● Equipped with walk-in oil in the crankcase (for starting engine oil arrows) ● Has a short axis ● Plug and play mounting ● View the images above to see which parts are present on the engine block Comes with weight rollers for a hum (45 km/h) scooter, if you have a moustache (25 km/h) scooter, you should order the moustaches yourself in size 16x13 and a weight of 8.5 grams. See what roles you can take below.

Where does this engine block fit under?

You can use this engine block to replace the defective engine block of your scooter. Your scooter must meet the following properties; 1. The rear wheel is 12 inches 2. There is only 1 shock absorber at the rear 3. It must be a 50cc scooter 4. The scooter was produced before 2018, so the license plate certificate also states the year of manufacture 2017 or an earlier year View the list of scooters where this engine block can be used below. Is your scooter not listed or are you unsure whether it is really correct? Then contact our customer service, we are here for you!

Assembly: GY6 139QMB 12 inch short axle engine

Now you would think that this is an impossible job to do yourself, but that is not so bad. In terms of special tools, you only need a lock key and flywheel puller when (if necessary) the ignition has to be transferred. This is because the GY6 138QMB motors have 2 types of ignition. To provide a clear picture, we made an assembly video. The engine block has already been filled with oil, just arrows before use. The advice is to change the oil after 500 km to increase the life of the engine. You can then have the standard maintenance carried out in accordance with the workshop manual for your type of scooter.