What category is the 2002 Yamaha YB-1 Four?

The 2002 Yamaha YB-1 Four has a Category of Classic.

What is the engine size of the 2002 Yamaha YB-1 Four?

The 2002 Yamaha YB-1 Four has a Capacity: of 49.00 ccm (2.99 cubic inches).

What type of engine does the 2002 Yamaha YB-1 Four have?

The 2002 Yamaha YB-1 Four has a Engine type of Single cylinder.

What is the engine power of the 2002 Yamaha YB-1 Four?

The 2002 Yamaha YB-1 Four has a Power of 4.10.

What is the torque of the 2002 Yamaha YB-1 Four?

The 2002 Yamaha YB-1 Four has a Torque of 4.00.

Is the 2002 Yamaha YB-1 Four air cooled or liquid cooled?

The 2002 Yamaha YB-1 Four has a Cooling system of Air.

How many gears does the 2002 Yamaha YB-1 Four have?

The 2002 Yamaha YB-1 Four has a Gearbox of 4-speed.

How much does the 2002 Yamaha YB-1 Four weigh?

The 2002 Yamaha YB-1 Four has a Dry weight of 83.0 kg (183.0 pounds).

What is the seat height of the 2002 Yamaha YB-1 Four?

The 2002 Yamaha YB-1 Four has a Seat height of 745 mm (29.3 inches) If adjustable, lowest setting..

Yamaha YB-1 Four - 2002 Specifications and Reviews

Name: 2002 Yamaha YB-1 Four
Brand: Yamaha
Rating: 5 (4 reviews)

The 2002 Yamaha YB-1 Four is a lightweight entry-level classic motorcycle ideal for beginner riders and urban commuters. Its modest 49cc single-cylinder engine delivers reliable performance with simplicity and fuel efficiency. Known for its nimble handling and approachable character, it remains a practical choice for learners seeking an affordable, easy-to-manage machine.

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2002

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Engine and Transmission Specifications
Transmission typefinal drive	Chain
Gearbox	4-speed
Cooling system	Air
Fuel control	SOHC
Valves per cylinder	2
Fuel system	Carburettor
Bore x stroke	36.0 x 48.6 mm (1.4 x 1.9 inches)
Compression	9.5:1
Torque	4.00
Power	4.10
Stroke	4
Engine type	Single cylinder
Capacity:	49.00 ccm (2.99 cubic inches)
Physical measures and capacities
Wheelbase	1,190 mm (46.9 inches)
Ground clearance	130 mm (5.1 inches)
Overall width	655 mm (25.8 inches)
Overall length	1,785 mm (70.3 inches)
Overall height	960 mm (37.8 inches)
Seat height	745 mm (29.3 inches) If adjustable, lowest setting.
Dry weight	83.0 kg (183.0 pounds)

Yamaha YB-1 Four dimensions and frame
Rear brakes	Expanding brake
Front brakes	Expanding brake
Speed and acceleration
Power/weight ratio	0.0494 HP/kg

Category	Classic
Year	2002
Model	Yamaha YB-1 Four
Other specs
Maintenance	Find parts, fluids, filters, maintenance tools and service items on eBay
Fuel capacity	7.20 litres (1.90 gallons)

Performance Profile & Rider Fit

4.1 hp

Peak Power

Best For

Track3%

City80%

Cornering35%

Daily Riding55%

Touring12%

Passenger15%

Rider Profile

Best For	This is an ideal machine for absolute beginners or those returning to riding after a long break, thanks to its tiny displacement and gentle power delivery.
Purpose	Built purely for short urban hops, errands, and light commuting rather than any kind of performance riding.
Rider Fit	Its very low seat height and featherweight dry weight of 83 kg make it extremely easy to handle for riders of small stature or limited strength.
Character	A charming, retro-styled classic commuter that prioritizes simplicity, economy, and easy manageability over excitement or speed.
Not Ideal For	This is not for riders seeking highway touring capability, passenger comfort, or any kind of spirited or off-road performance.

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

Rider Fit Visualizer

2002 Yamaha YB-1 Four Rider Ergonomics Assessment

Your height

Inseam (optional)

Units

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Feet:

At 745mm, a rider of 175cm with a 79cm (estimated) inseam will reach the ground with both feet flat on the 2002 Yamaha YB-1 Four, with a moderate knee angle of around 105 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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