Yamaha YZF-R125
Yamaha have released the smallest of the R series, the YZF-R125
Yamaha R125
The YZF-R125 runs a liquid-cooled, 4-stroke, 4-valve, single cylinder, SOHC engine that is tuned to deliver free-revving power right through to maximum at 9000rpm. For instant response and efficient operation the 6-speed 125 is equipped with a compact fuel injection system.
The chassis features a Deltabox frame and aluminium swinging arm, with lightweight 5-spoke wheels. A large diameter 292mm front disc with a 230mm diameter rear disc make for effective stopping power.
Featuring bore and stroke dimensions of 52mm x 58.6mm, the compact engine has a free-revving character that delivers strong acceleration. 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.
The 125 sports a large capacity R6-style mid-ship muffler,with dual catalysers, as well as an air induction system which introduces air into the exhaust to enable more complete combustion of any unburnt gases.
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 keeps the engine on the boil and ensures a competitive top speed.
Engine technical highlights
* 125cc 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
* Class leading performance
Full-sized chassis with Deltabox frame
Just like its larger R-series brothers, the new R125 features a “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 besthandling 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 1353mm, over 58mm greater than a typical sports 125, which helps to enhance stability.
The larger physical size of the machine also allowed Yamaha’s 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.
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.
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.
The large diameter 292mm front disc is slowed by a compact twinpot caliper which delivers strong and progressive braking performance. The large front disc is complemented by a 230mm rear disc.
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.
Chassis
Technical highlights
* Steel Deltabox frame
* Cast aluminium swinging arm
* Full-sized chassis and bodywork
* 1355mm wheelbase
* Dual R-series style headlamps
* 292mm diameter front disc brake
* 230mm diameter rear disc brake
* Compact LED tail light
* 33mm diameter front forks
* 130mm front wheel suspension travel
Yamaha has developed a range of quality accessories for YZF-R125 owners wishing to customise their bike.
* Accessories available:
o Double bubble screen
o Seat cover
o Carbon yoke protector
o Roller protectors
o Tank pad
