Yamaha YBR 125 workshop manuals on Ebay UK
The Yamaha YBR 125 is the backbone of the global 125cc market. From its 2005 debut to the final 2017 "Custom" and "Z" models, this bike has defined the learner-legal commuter. Whether you have the early "kick-start" version or the late "Euro 4" fuel-injected model, this is your definitive spec and maintenance sheet.
🛠 The Evolution of the YBR 125
Gen 1 (2005–2006): Mikuni VM22 Carburetor + Kick-start & Electric start. (The DIY mechanic's favorite).
Gen 2 (2007–2009): Transition to Fuel Injection (EFI). No kick-start. New analog clocks and redesigned exhaust.
Gen 3 (2010–2014): Aesthetic face-lift with sharper tank fairings, five-spoke alloy wheels, and improved fuel pump reliability.
Gen 4 (2015–2017): Final production run. Minor emissions tweaks to meet Euro 4 standards before the Yamaha YS125 replaced it.
🔍 Master Technical Specifications (All Models)
Engine: 124cc, Air-cooled, 2-valve, SOHC Single.
Power Output: 10 hp (7.5 kW) @ 7,800 rpm.
Fuel Consumption: An incredible 90–110 mpg (Real world).
Oil Capacity: 1.0 Liter (10W-40 JASO MA). Note: Change every 2,000 miles.
Tires: Front: 2.75-18 / Rear: 90/90-18. (Upgrade to Michelin Pilot Street for 50% better wet grip).
Chain: 428 Pitch (Standard is 118 links).
⚠️ The "Critical 3" Maintenance Checks
The Fuel Pump (2007+ Models): Early EFI models were known for fuel pumps that seized in hot weather. If your bike won't start after sitting in the sun, cool the tank with a damp cloth.
Exhaust Corrosion: The OEM exhaust is thin. Clean it weekly and apply high-temp black paint or ACF-50 to prevent "rust-through" near the header.
Valve Clearances: The YBR is a "tappy" engine, but too much noise means power loss. Clearance: 0.08mm - 0.12mm (Inlet/Exhaust). Check every 4,000 miles.
Displacement 124 cc
Bore x stroke 54.0 x 54.0 mm
Compression ratio 10.0 : 1
Maximum power 7.5 kW (10 PS) @ 7,800 rpm
Maximum torque 9.6 Nm (0.98 kg-m) @ 6,000 rpm
Lubrication system Wet sump
Fuel System Fuel injection
Clutch type Wet, multiple disc
Ignition system TCI
Starter system Electric and kick
Transmission system Constant mesh, 5-speed
Final transmission Chain
Fuel tank capacity 13 L
Oil tank capacity 1.2 L
Chassis -
Chassis: Diamond shaped
Front suspension system Telescopic forks
Front travel 120 mm
Rear suspension system Swingarm
Rear travel 105 mm
Caster angle 26º 20′
Trail 90 mm
Front brake Single disc, Ø 245 mm
Rear brake Drum, Ø 130 mm
Front tyre 2.75-18 42P
Rear tyre 90/90-18 M/C 57P
Dimensions -
Length 1,980 mm
Width 745 mm
Height 1,080 mm
Seat height 780 mm
Wheel base 1,290 mm
Minimum ground clearance 175 mm
Wet weight 124 kg
see more Yamaha YBR 125 blog posts
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