Complete engine block GY6 139QMB 12" (long axle) 45km/h E4 ECS China scooters

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

When to replace the GY6 139QMB long axle 12" ECS engine block?

If something crashes in your engine block (at higher revs, for example), a lot of things can go wrong.
● Gears jam or break off
● Certain parts no longer receive 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've added up all the costs is maybe buy a completely new engine block! It happens that this is cheaper than replacing everything separately.

Features of the GY6 139QMB complete 12" long axle ECS engine block

● New engine with new parts
● Suitable for replacing the old GY6 139QMB engine
● Equipped with inlet oil in the crankcase (to start engine oil arrows)
● Has a long axle
● Plug and play mounting
● Comes without a carburetor and sensors, which you can transfer from the old engine block

Comes with the correct parts in the engine block for a moustache (45 km/h) scooter. Please note that the 25 km/h and 45 km/h engine block of a scooter with ECS is not easily interchangeable.

Where does this engine 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. Has 2 rear shock absorbers
3. It must be a 50cc scooter
4. The scooter was produced in the year 2018 or later
5. The scooter runs 45km/h as standard
6. The scooter is a Euro4 model
7. the scooter is equipped with an ECS (electronic carburetor system) and a Dellorto ECU

View the list below of scooters where this engine block can be used. Is your scooter not listed or are you unsure whether it is really correct? Then contact our customer service, we are there for you!

GY6 139QMB 12-inch long axle ECS engine block assembly

Now you would think that this is an impossible job to do yourself, but that's not so bad. To provide a clear picture, we made an assembly video on how to install the engine block. This is a video of a Euro2 scooter (built before 2018), but you can use it to explain how to assemble this engine block. The engine block is already filled with oil, but only arrows for use. It is recommended to change the oil after 500 km to increase the life of the engine. You can then have the standard maintenance sessions take place in accordance with the workshop manual for your type of scooter.

Watch the video below to explain how to replace the engine block. It is a Euro2 10" scooter engine, but is good to use to get an idea of what to look for and how to proceed.