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2008 Yamaha YZF-R125

2008 Yamaha YZF-R125

The most advanced 125 supersport!
For 2008 Yamaha will launch the all-new YZF-R125, an exciting new member of the R-series family which is aimed at taking the number one position in the sports 125cc market.

Featuring a liquid-cooled single-cylinder engine running in full-sized Deltabox chassis – and clothed in aggressive R-series style bodywork –  the YZF-R125 is aimed at the young first-time 125 buyer who demands best-in-class engine and handling performance, and winning R-series style.

Yamaha’s first liquid-cooled 125cc 4-stroke 4-valve single
The R125’s all-new 124cc 4-stroke engine is the most advanced in the category, and just like its larger-capacity R-series brothers, it has been developed to deliver class-leading performance.

In order to achieve this goal, Yamaha’s engineers have created the company’s first ever liquid-cooled 4-stroke single-cylinder 125cc SOHC engine. The new R125 benefits from a 4-valve cylinder head which delivers high levels of intake and exhaust efficiency for ultra-responsive performance.

Fuel injection
For instant throttle response, this new high-tech 125 features a compact fuel injection system fed by a large-capacity airbox which, combined with the two inlet valves, delivers optimum intake efficiency together with excellent throttle response across the rev range.

Free-revving long-stroke engine
Featuring bore and stroke dimensions of 52mm x 58.6mm, the compact short-stroke engine has a free-revving character which enables it to deliver strong acceleration. This long stroke layout – combined with the performance-boosting qualities of the 4-valve head, fuel injection system and free-flowing exhaust – gives the R125 the strongest overall performance in the 125 4-stroke class.

R6-style mid-ship muffler
Performance is also enhanced by the fitment of a free-flowing large-capacity R6-style mid-ship muffler, whose location helps to centralise mass for neutral handling performance. The exhaust system accommodates dual catalysers, as well as an air induction system which introduces air into the exhaust to enable more complete combustion of any unburnt gases, and in doing so it helps to reduce emissions to even lower levels.

6-speed transmission
To optimise the class-leading performance characteristics of its all-new high-tech 125cc liquid-cooled engine, the R125 is equipped with a 6-speed transmission which ensures strong acceleration and a competitive top speed.

Technical highlights

  • Liquid-cooled single-cylinder 4-stroke
  • SOHC 4-valve cylinder head
  • Wet-sump lubrication system
  • Fuel injection
  • Electric start
  • 6-speed transmission
  • R6-style mid-ship muffler
  • Dual catalysers
  • Air Induction system

Full-sized chassis with Deltabox frame
Just like its larger R-series brothers, the new R125 features a lightweight Deltabox frame which delivers an optimum balance of strength and rigidity for class-leading handling performance. The twin spar Deltabox design has proved to be one of the lightest and best-handling frame designs in the supersport category, and its use on the new YZF-R125 underlines Yamaha’s total commitment to building the best-handling machine in the class.

One of the most significant features of the new R125 is that it has been constructed with a full-sized chassis, which is unique in its segment. For example, the wheelbase on the new Yamaha R-series is 1,353mm, over 58mm greater than a typical sports 125, which helps to enhance stability.
The larger physical size of the machine also allows our designers more freedom in creating a sporty yet comfortable riding position. And finally, the larger chassis gives the machine far greater presence on the street.

Aggressively-styled full-sized supersport bodywork
With its unmistakeable R-series styling, the R125 stands out in the crowd, and is easy to mistake for a much larger capacity machine. The dual headlights have a distinctive R-series look, while the low frontal area and small tail are clearly influenced by the bigger R-series bikes. And like the chassis, the bodywork is full-sized, making this new sportsbike the most impressive looking machines in the class.

Aluminium swinging arm
Complementing the race-bred Deltabox frame is a cast aluminium swinging arm. By keeping unsprung weight low, this high quality swinging arm allows the link-type rear suspension system to operate more efficiently and deliver more responsive handling qualities.

33mm diameter front forks
Equipped with large-diameter 33mm tubes, the smooth-action front forks are designed to deliver accurate steering together with good rider comfort. For easy manoeuvrability this high quality front suspension system features a steering angle of 24.2degrees and trail of 86.1mm. And with 130mm of wheel travel – over 20mm more than some other models in the class – the full-sized forks on the new R125 perfectly complement the Deltabox frame and aluminium swinging arm to deliver stable yet responsive handling.

Large diameter front disc
High build quality is evident wherever you look on the new R125, and the front braking system is another example of Yamaha’s commitment to using only high-specification components.

The large diameter 292mm front disc is slowed by a compact twin-pot caliper which delivers strong and progressive braking performance for good controllability over a wide range of speeds. The large single front disc is complemented by a 230mm rear disc, giving the R125 rider accurate control in town as well as on the open road.

Lightweight alloy wheels with wide-section tyres
As well as ensuring that the unsprung weight is minimised in order to enhance the front and rear suspension performance, the distinctive 10-spoke alloy wheels give the R125 a unique look.

The lightweight wheels are fitted with some of the widest rubber in the class, with a 100/80-17 tyre at the front, and a massive 130/70-17 tyre at the rear, which ensure high levels of traction and underline the YZF-R125’s position as the main contender in the sports 125 class for 2008.

Range of quality accessories
Yamaha have developed a range of quality accessories for YZF-R125 owners wishing to customise their bike. The line-up includes a double bubble screen, a yoke, a seat cover, roller protectors and a tank pad.

Technical highlights

  • Lightweight steel Deltabox frame
  • Cast aluminium swinging arm
  • Aggressive R-series styling
  • High quality components
  • Leading build quality
  • Full-sized chassis and bodywork
  • 1,355mm wheelbase
  • Sports riding position
  • Dual R-series style headlamps
  • 292mm diameter front disc brake
  • 230mm diameter rear disc brake
  • Ultra-compact tail cowl
  • Compact LED tail light
  • 33mm diameter front forks
  • 130mm front wheel suspension travel
  • 130/70-17 rear tyre; 100/80-17 front tyre
  • Range of accessories:
      • Double bubble screen
      • Seat cover
      • Carbon yoke protector
      • Roller protectors
      • Tank pad

Available colours
Burning Blue
Sports White
Impact Yellow
Midnight black

Type Liquid-cooled, 4-stroke, 4-valve, single cylinder, SOHC
Displacement 124.66 cc
Bore & stroke 52.0 x 58.6 mm
Compression Ratio 11.2 : 1
Max. power 11.0 kW (15 PS) @ 9,000 rpm
Max. torque 12.24 Nm (1,25 kg-m) @ 8,000 rpm
Lubrication Wet sump
Carburettor / Fuel supply Fuel injection
Clutch type Wet, multiple-disc coil spring
Ignition TCI
Starter system Electric
Transmission Constant mesh, 6 speed
Final transmission Chain
Primary reduction ratio 73/24  (3.042)
Secondary reduction ratio 48/14  (3.429)
Gear ratio:  
Gear ratio-1st gear 34/12  (2.833)
Gear ratio-2nd gear 30/16  (1.875)
Gear ratio-3rd gear 30/22  (1.364)
Gear ratio-4th gear 24/21  (1.143)
Gear ratio-5th gear 22/23  (0.957)
Gear ratio-5th gear 21/25  (0.840)
Frame Steel Deltabox 
Front suspension Telescopic forks
Front wheel travel 130 mm
Rear suspension Swingarm (monocross)
Rear wheel travel 125 mm
Caster angle 24.2°
Trial 86.1 mm
Front brake Single disc, Æ 292 mm
Rear brake Single disc, Æ 230 mm
Front tyre 100/80-17 M/C
Rear tyre 130/70-17 M/C
Overall length 2,015 mm
Overall width 660 mm
Overall height 970 mm
Seat height 818 mm
Wheelbase 1,355 mm
Min. ground clearance 155 mm
Dry weight 126.5 kg
Fuel tank capacity 13.8 litres
Oil capacity 1.15 litres
Specification are subject to change without notice, in accordance with national regulation and legislations