139qmb GY6 Scooter Engine Assembly

 Step-by-step scooter engine assembly — from the crankcase to the installation of all main components.

The video shows the correct assembly sequence, key details to watch for, and useful tips for those rebuilding their engine by themselves.

Engine Lubrication System Animation

 A detailed 3D visualization of an internal combustion engine lubrication system. Watch how oil circulates through the pump, filter, crankshaft, and camshaft to reduce friction and wear. To watch the video for free, go to my Patreon.

 Pouring coolant into the engine through the radiator.

When filling the system, the coolant enters through the radiator neck, from where it gradually spreads through the cooling channels in the block and cylinder head. This allows air to be purged and prepares the circuit for circulation.

Due to ongoing issues with YouTube, I am currently unable to upload new videos to the platform.

For this reason, all my new videos are being published on my Patreon.

If the possibility to use YouTube returns — and if it does — I will upload my Patreon videos to YouTube as well.

Please follow my other social networks to stay updated: https://linktr.ee/SanyaTsvay

How does a scooter variator work?

watch on Patreon

#Sanya tsvay

how does a scooter engine work

Fuel System and Carburetor Operation in a 4-Stroke Scooter Engine

Here you can watch a video of 3D animation of the scooter in operation(the video is on the patreon):

Vacuum-operated fuel valve
The valve diaphragm is supported by a spring and normally blocks fuel flow. During the intake stroke, vacuum in the intake manifold travels through a hose to the valve. Under atmospheric pressure, the diaphragm bends and fuel flows by gravity into the carburetor.

If the carburetor float chamber is empty, the float is down, allowing fuel in. As the chamber fills, the float rises and pushes the needle valve upward. Once the correct level is reached, the needle blocks further fuel supply.