Model Name:YB-1

Manufacturer:YAMAHA

Model Year:1996

It was based on YB50. It had a sporty tank and a seat that resembled the days of the 60s. Its power could be raised drastically by tuning up.

Specifications:

[Basic spec]

Manufacturer	YAMAHA	Engine Type	2 Cycle Air-Cooled Rotary Disc Valve
Model Name	YB-1	Starter	Kick Starter
Grade	–	Maximum Output (ps)	4.6ps(3.4kw)/6000rpm
Drive Train	–	Maximum Torque (kgf/m)	0.56kg-m(5.5N-m)/5500rpm
Model Type	F5B	Curb Weight	84
Displacement	49	Dry Weight	75
Sales Launch Year	1996/1	Fuel Efficiency by Catalog	80 km/L (at 30 km/h)
Height/Width/Length	960/-/1760	Fuel Tank Capacity	8
Seat Height	–	Distance to Empty	–
Front Tire Indication	2.25-17 4PR	Fuel Supply	Carburetor
Rear Tire Indication	2.50-17 4PR

[Service data]

Standard Plug	BPR6HS	Chain Size	420
Number of Used Plugs	1	Chain Link Number	96
Engine Oil Amount	1.4	Battery Code	FT4B-5
Engine Oil (Refill)	–	Headlight	12V 30w/30w
Engine Oil (Element Replacement)	–	Headlight Type	PH7
Front Blinker Rating	12V 10w	Headlight Remarks	–
Drive Sprocket Teeth Number	11	Tail Light Rating	12V 21w/5w
Driven Sprocket Teeth Number	39	Rear Blinker Rating	12V 10w

[Machine detail]

Motor Model Code	F5B	Caster Angle	26.5 Degrees
Bore (mm)	40	Trail (mm)	75
Storke (mm)	39.7	Minimum Ground Clearance	–
Compression Ratio	6.7	Distance Between Axes	–
Ignition Method	C.D.I	Streering Angle (Right)	–
Engine Lubrication Type	Separate Lubrication (Yamaha Autolube)	Turning Angle (Left)	–
Frame Type	Backbone (Press)	Mirror Screw Hole Diameter	10mm
Minimum Rotaion Radius	1.8	Fuel Tank Reserve Capacity	–

[Underbody detail]

Front Brake Type	Drum (Leading Trailing)	Suspension Type (Rear)	–
Front Brake Remarks	–	Number of Rear Shock Absorbers	–
Rear Brake Type	Drum (Leading Trailing)	Rear Suspension Stroke	–
Rear Brake Remarks	–	Rear Wheel Travel	–
Suspension Type (Front)	–	ABS	–
Front Fork Type	–	Drive Train	–
Front Suspension Stroke	–	Differential Oil Amount	–
Front Fork Diameter	–	Chain Remarks	–

[Equipment]

Seat Lowering Allowance	–	Theft Prevention Device	–
Mirror Screw Hole Diameter	10mm	Tail Light Bulb Type	S25
Mirror Remarks	Use screw type mirror or reverse screw adapter. 58E4-E5: 8mm	Tail Light Base Shape	BAY15D
Electronic Device Remarks	–	Tail Light Base Shape 2	–
Fuel Gauge	–	Tail Light Remarks	Glass Shape G18 Also Installable
Clock	–	Front Blinker Bulb Type	G18
Hazard	–	Front Blinker Base Shape	–

[Engine detail]

Clutch Type	Wet Multiple Plate Coil Spring	Tappet Clearance (mm) EX	–
Transmission	4-Stage Rotary	Idling Initial Value (rpm)	–
Number of Gears	4	Needle Steps (Clip Location)	–
Gear Ratio	3.077 / 1.889 / 1.304 / 1.038	Float Level (mm)	–
Primary Reduction Ratio	3.894	Air Screw Return	–
Secondary Reduction Ratio	3.545	Main Jet Type	–
Variable Speed Vehicle Gear Ratio	–	Main Jet Number	#95
Tappet Clearance (mm) IN	–

[Other spec]

Clutch Cable Length	–	Rear Brake Cable Length	–
Choke Cable Length	–	Other Cables	–
Meter Cable Length	–	Engine Number (Production Launch)	–
Throttle Cable Length	–	Engine Number (Production End)	–
Front Brake Cable Length	–

[See Moto Index of YAMAHA]
[See Accessories for YAMAHA YB-1]