here are the specs from official website
YBR125 2014 Technical details - Motorcycles - Yamaha Motor Europe
Engine
[TABLE="class: spec, width: 9"]
<tbody>[TR="bgcolor: #FFFFFF"]
[TD="class: title"]Engine type[/TD]
[TD]4-stroke, air-cooled, SOHC, Forward-inclined single cylinder, 2-valves[/TD]
[/TR]
[TR="bgcolor: #FFFFFF"]
[TD="class: title"]Displacement[/TD]
[TD]124cc[/TD]
[/TR]
[TR="bgcolor: #FFFFFF"]
[TD="class: title"]Bore x stroke[/TD]
[TD]54.0 mm x 54.0 mm[/TD]
[/TR]
[TR="bgcolor: #FFFFFF"]
[TD="class: title"]Compression ratio[/TD]
[TD]10.0 : 1[/TD]
[/TR]
[TR="bgcolor: #FFFFFF"]
[TD="class: title"]Maximum power[/TD]
[TD]7.5 kW (10.0PS) @ 7,800 rpm[/TD]
[/TR]
[TR="bgcolor: #FFFFFF"]
[TD="class: title"]Limited power version[/TD]
[TD]kW (PS) @ rpm[/TD]
[/TR]
[TR="bgcolor: #FFFFFF"]
[TD="class: title"]Maximum Torque[/TD]
[TD]9.6 Nm (0.98 kg-m) @ 6,000 rpm[/TD]
[/TR]
[TR="bgcolor: #FFFFFF"]
[TD="class: title"]Lubrication system[/TD]
[TD]Wet sump[/TD]
[/TR]
[TR="bgcolor: #FFFFFF"]
[TD="class: title"]Clutch Type[/TD]
[TD]Wet, multiple-disc coil spring[/TD]
[/TR]
[TR="bgcolor: #FFFFFF"]
[TD="class: title"]Carburettor[/TD]
[TD]Fuel Injection[/TD]
[/TR]
[TR="bgcolor: #FFFFFF"]
[TD="class: title"]Ignition system[/TD]
[TD]TCI[/TD]
[/TR]
[TR="bgcolor: #FFFFFF"]
[TD="class: title"]Starter system[/TD]
[TD]Electric[/TD]
[/TR]
[TR="bgcolor: #FFFFFF"]
[TD="class: title"]Transmission system[/TD]
[TD]Constant Mesh, 5-speed[/TD]
[/TR]
[TR="bgcolor: #FFFFFF"]
[TD="class: title"]Final transmission[/TD]
[TD]Chain[/TD]
[/TR]
</tbody>[/TABLE]