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

Product ID: 485844954

Details

Brand
HASANEN
Vehicle Service Type
Dirt Bike
Fuel Type
Petrol
Recommended Uses For Product
Motorcycle
Product Dimensions
27.9D x 13.2W

⚙️1.9kW power output

🏎️7000 RPM max speed

🛠️Complete with gear box & air filter

$352.87

Duties & taxes included

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Sold byAmazon USADelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Power your mini ride with precision and speed!

PLUG PLAY UPGRADE - Comes fully equipped with air filter, powder-coated pull start, and 14mm carburettor for instant installation.
RACE READY 49 CC POWERHOUSE - Unleash up to 40mph with a high-performance 2-stroke engine designed for thrill seekers.
DURABILITY MEETS CONVENIENCE - Air-cooled design plus electronic ignition system ensures reliable starts and extended engine life.
PRECISION ENGINEERING INSIDE - Balanced crank and flywheel with ported piston windows for smooth, efficient power delivery.
VERSATILE MINI BIKE COMPATIBILITY - Perfect fit for 49cc pocket bikes, mini dirt bikes, ATVs, and scooters—upgrade your ride effortlessly.

This 49cc 2-stroke mini motorbike engine delivers 1.9kW at 7000rpm, reaching speeds up to 40mph. Engineered with a balanced crank and flywheel, it includes a gear box, air filter, and electronic ignition for reliable performance. Ideal for upgrading or converting mini dirt bikes, ATVs, and scooters, it offers a plug-and-play solution with durable air-cooled design and high-quality components.

Specifications

ASIN	B07WXHZKLF
Best Sellers Rank	#105,543 in Car & Motorbike ( See Top 100 in Car & Motorbike ) #763 in Engines & Engine Parts
Brand	HASANEN
Brand Name	HASANEN
Compatible with Vehicle Type	Dirt Bike
Customer Reviews	3.9 out of 5 stars 198 Reviews
Fuel Type	Petrol
Item Dimensions D x W x H	27.9D x 13.2W x 22.9H Centimeters
Item Type Name	49CC 2-Stroke Engine&Transfer Motor
Manufacturer	Gdrasuya
Manufacturer Part Number	1
Model	YCZYQ-1758
Net Quantity	1 Count
Product Dimensions	27.9D x 13.2W x 22.9H Centimeters
Recommended Uses For Product	Motorcycle
UPC	760385686083
Unit Count	1 Count
Vehicle Service Type	Dirt Bike
What Is In the Box	1*49cc Two-stroke Engine

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