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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⚡ Power your mini ride, dominate the dirt! ⚡

DURABLE LIGHTWEIGHT - Crafted from premium aluminum and metal, weighing just 4kg for optimal performance without the bulk.
PRECISION ENGINEERING - Balanced crank and flywheel with ported piston windows ensure smooth, efficient power delivery.
RACE READY 1 9 K W POWER - Unleash up to 40mph with a high-performance 49cc 2-stroke engine built for speed and thrill.
PLUG PLAY CONVENIENCE - Comes fully equipped with air filter, powder-coated pull start, and electronic ignition for hassle-free installation.
VERSATILE COMPATIBILITY - Perfect upgrade for mini dirt bikes, ATVs, scooters, and pocket bikes—turn your ride into a powerhouse.

This 49cc 2-stroke mini motorbike engine delivers 1.9kW at 7000rpm, reaching speeds up to 40mph. Featuring a balanced crankshaft, ported piston windows, and a complete gearbox with electronic ignition, it’s designed for mini dirt bikes, ATVs, and scooters. Lightweight aluminum construction and a high-quality air filter ensure durability and performance, making it the ultimate upgrade for thrill-seeking riders.

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R5874

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South Africastore

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Brand	HASANEN
Vehicle Service Type	Dirt Bike
Fuel Type	Petrol
Recommended Uses For Product	Motorcycle
Product Dimensions	27.9D x 13.2W x 22.9H Centimeters
Manufacturer	Gdrasuya
UPC	760385686083
Model	49CC 2 Stroke
Item model number	YCZYQ-1758
Manufacturer Part Number	1
Material	Aluminium, Metal
Assembly Required	No
Voltage	12 Volts
Item Weight	499 g

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

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