can the moter go on a uber scoot 2 speed 50cc

I don't know what that is but is it semiautomatic or a 2 speed auto belt drive setup like gokarts with torque converters? If it has a gearbox with shifter than it would have to be separate from the engine itself most motorcycle gearboxes are built in to the engine thus they're one complete unit so you cannot mate the gearbox to another engine. If the gearbox is its own unit and separate from the engine meaning not built in to the engine than it is possible to use this engine yes. Now if the gearing in your gearbox is too tall the engine will struggle. You can help the engine struggle less by changing to smaller front sprocket or a larger rear sprocket. This should cover your question and any others you might have. If not I will provide any info I can to help further.

What is the black wire coming outa the engine near the spark plug with the connector on it for?

It's for a ground or the kill switch. Can't remember.

Does this use a #40 chain?

Can't remember I gave up on the engine and put an electric motor on my bicycle . I gave the engine to my older son and said try making a chain saw out of it . lol

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49CC/50CC Bike Engine, 1.9kw/7000rpm 2-Stroke Engine&Transfer Motor W/Gear Box Air Filter & Pull Rope Start and Electronic Ignition System Mini Motorbike Engine for Mini Pocket Dirt Bike ATV/Scooter

49CC/50CC Bike Engine, 1.9kw/7000rpm 2-Stroke Engine&Transfer Motor W/Gear Box Air Filter & Pull Rope Start and Electronic Ignition System Mini Motorbike Engine for Mini Pocket Dirt Bike ATV/Scooter

Product ID: 153846318

Details

Brand
HASANEN
Fuel Type
Gasoline
Number of Items
1
UPC
760385686083
Unit Count
1 Count

🔥2-stroke high-efficiency engine

⚙️1.9kW max power @7000rpm

❄️Air cooling system prevents overheating

R4942

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Description

⚡ Unleash Mini Power, Maximize Your Ride!

COOL UNDER PRESSURE - Advanced air cooling system keeps your engine running flawlessly, no matter the heat.
START FAST RIDE FASTER - Electronic ignition and pull rope start combine for lightning-quick, reliable engine ignition every time.
ENGINEERED FOR ENDURANCE - Premium aluminum build ensures wear and corrosion resistance for rugged, long-lasting performance.
POWER THAT COMMANDS THE ROAD - 1.9kW peak power delivers smooth, unstoppable acceleration up to 48km/h.
SEAMLESS CONTROL MAXIMUM EFFICIENCY - Upgraded CVT gearbox and stable bearing optimize response and operational smoothness.

This 49CC/50CC 2-stroke mini bike engine delivers 1.9kW at 7000rpm with an efficient air cooling system and electronic ignition for quick starts. Built from premium aluminum for durability and equipped with an upgraded CVT gearbox, it supports speeds up to 48km/h and a load capacity of nearly 400 lbs, making it ideal for mini dirt bikes, ATVs, and scooters seeking reliable, high-performance power.

Specifications

ASIN	B07WXHZKLF
Best Sellers Rank	#803,839 in Automotive ( See Top 100 in Automotive ) #376 in Powersports Engine Kits
Brand	HASANEN
Brand Name	HASANEN
Customer Reviews	3.8 out of 5 stars 203 Reviews
Fuel Type	Gasoline
Included Components	1* Engine
Manufacturer Part Number	1
Model Number	YCZYQ-1758
Number of Items	1
UPC	760385686083
Unit Count	1 Count

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R4942

Duties & taxes included

In stock

Sold byAmazon South AfricaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to South Africa.

Secure transaction

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