Now the news in the auto circles is rife that Yamaha is indeed launching the new Yamaha R15 on the 25th of January 2011. The 2011 version of the Yamaha R15 also features a pair of really sexy looking 5 spoke (actually 10, if you count a pair as 2) alloys, a high pillion seat and LED tail lamps. Is it more biased towards form than the ‘true to function’ current version. Won’t the fatter tyres reduce the sprint timings?
The design is similar to that of YZF-R series. Yamaha R15 has India’s first 150cc 4 valve engine with forged pistons, Deltabox frame & 6speed gear box. Since sporty YZF R15 is shorter too and its height is just 1070mm. YZF R15 features F 80/90 -17 inches tyres in the front and 100/80-17 inches tyres in the rear. Yamaha has also provided the rim stripe tape in the Yellow, red and black bikes. Looks and Style of Yamaha R15
Yamaha R15 has all the characteristics of motorcycles which designed by Yamaha to represent the R series which reflects the philosophy running through these models — expressing performance visually. Viewed from the side, the shape of "Yamaha R15" created by the side panel and the upper surface of the tank creates an impression of the center of gravity shifting to the front tire. Needless to say, YZF-R1, with its athletic build, is also a visual expression of performance. YZF-R15’s design is based on having an excellent engine cooling method. The core of Yamaha R15 (Engine)
YZF-R15 is powered by an all-aluminum cylinder called the DiASil Cylinder and a forged piston, the same type of piston used in Yamaha’s supersport bikes. The fact that both the piston and cylinder of YZF-R15 are all-aluminum ensures excellent heat dissipation, eliminates heat-induced engine power loss, and helps improve fuel efficiency. Additionally, the piston of Yamaha R15 is made in a forging process, the optimum way of achieving lightweight designs.The reciprocating mass with the forged piston is approximately 20% less ( according to Yamaha test ) than with an engine of the same displacement fitted with a conventional cast aluminum piston. Yamaha developed its proprietary “controlled forging technology” in 1997, which enables mass production of forged aluminum pistons. Chassis of Yamaha R15
The linked monocross suspension consists of a link mechanism sandwiched between the rear arm and cushion unit to create changes in the lever ratio based on the lever effect. As the shock absorber strokes in, the lever ratio of Yamaha R15 gradually decreases and the spring rate increases. The duct area of the intake duct was designed optimally to optimize the flow of intake air.
This also increases the total valve area relative to the 2-valve chambers for improved intake/exhaust efficiency (volumetric efficiency). YZF-R15 is fitted with a hemispherical 4-valve combustion chamber, a configuration that allows intake and exhaust valves to be laid out in the smallest size possible.