What category is the 2009 Yamaha Neos 4S?

The 2009 Yamaha Neos 4S has a Category of Scooter.

What is the engine size of the 2009 Yamaha Neos 4S?

The 2009 Yamaha Neos 4S has a Capacity: of 49.40 ccm (3.01 cubic inches).

What type of engine does the 2009 Yamaha Neos 4S have?

The 2009 Yamaha Neos 4S has a Engine type of Single cylinder.

What is the engine power of the 2009 Yamaha Neos 4S?

The 2009 Yamaha Neos 4S has a Power of 3.08.

What is the torque of the 2009 Yamaha Neos 4S?

The 2009 Yamaha Neos 4S has a Torque of 3.15.

Is the 2009 Yamaha Neos 4S air cooled or liquid cooled?

The 2009 Yamaha Neos 4S has a Cooling system of Liquid.

How many gears does the 2009 Yamaha Neos 4S have?

The 2009 Yamaha Neos 4S has a Gearbox of Automatic.

How much does the 2009 Yamaha Neos 4S weigh?

The 2009 Yamaha Neos 4S has a Weight incl. oil, gas, etc of 95.0 kg (209.4 pounds).

What is the seat height of the 2009 Yamaha Neos 4S?

The 2009 Yamaha Neos 4S has a Seat height of 790 mm (31.1 inches) If adjustable, lowest setting..

Yamaha Neos 4S - 2009 Specifications and Reviews

Name: 2009 Yamaha Neos 4S
Brand: Yamaha

The 2009 Yamaha Neos 4S is a lightweight 49cc scooter designed for urban commuters and entry-level riders seeking practical, fuel-efficient transportation. Known for its reliable liquid-cooled four-stroke engine and dependable electric starter, it excels as an affordable city runabout. The Neos 4S offers nimble handling and easy maneuverability in congested traffic.

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2009

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Engine and Transmission Specifications
Transmission typefinal drive	Belt
Gearbox	Automatic
Cooling system	Liquid
Lubrication system	Wet sump
Starter	Electric & kick
Ignition	TCI
Fuel system	Injection
Bore x stroke	38.0 x 43.6 mm (1.5 x 1.7 inches)
Compression	12.0:1
Torque	3.15
Power	3.08
Stroke	4
Engine type	Single cylinder
Capacity:	49.40 ccm (3.01 cubic inches)
Physical measures and capacities
Wheelbase	1,275 mm (50.2 inches)
Overall length	1,840 mm (72.4 inches)
Seat height	790 mm (31.1 inches) If adjustable, lowest setting.
Weight incl. oil, gas, etc	95.0 kg (209.4 pounds)
Yamaha Neos 4S dimensions and frame
Rear brakes diameter	110 mm (4.3 inches)
Rear brakes	Expanding brake (drum brake)
Front brakes diameter	190 mm (7.5 inches)
Front brakes	Single disc
Rear tyre dimensions	130/70-12
Front tyre dimensions	120/70-12
Rear suspension	Unit swing
Front suspension	Telescopic fork

Speed and acceleration
Fuel capacity	5.40 litres (1.43 gallons)

Category	Scooter
Year	2009
Model	Yamaha Neos 4S
Other specs
Maintenance	Find parts, fluids, filters, maintenance tools and service items on eBay

Performance Profile & Rider Fit

3.1 hp

Peak Power

Best For

Track5%

City88%

Cornering30%

Daily Riding75%

Touring12%

Passenger25%

Rider Profile

Best For	Suitable for absolute beginners or anyone wanting a simple, low-risk twist-and-go runabout with no gear shifting to worry about.
Purpose	Built purely for short urban hops, commuting, and running errands around town, not for speed or distance.
Rider Fit	Very light and low, with an easy reach to the ground, making it accessible for smaller or less experienced riders.
Character	A friendly, unintimidating 50cc scooter that prioritizes ease of use, fuel efficiency, and nimble city maneuvering over performance.
Not Ideal For	Not suitable for highway riding, long-distance touring, carrying a heavy passenger, or anyone seeking real acceleration or speed.

Character map is an editorial estimate based on this bike's specifications, not a lab-tested measurement.

Rider Fit Visualizer

2009 Yamaha Neos 4S Rider Ergonomics Assessment

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Inseam (optional)

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Feet:

At 790mm, a rider of 175cm with a 79cm (estimated) inseam will reach the ground with both feet flat on the 2009 Yamaha Neos 4S, with a moderate knee angle of around 100 degrees and a slightly forward riding position.

Data quality: measured. Assumes about 30mm of suspension sag once seated (a typical street-bike rule of thumb - stiffer or softer suspension will vary). This is an approximation from category-typical geometry and generic body proportions, not a measurement of this specific bike or you - sit on it before you buy.

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