MODEL YZF R15

Liquid-cooled

First Indian made model with cooled Engine. Liquid Cooled Engine provide stable performance, reduce vibrations, and offer a high quality ride.

The engine is surrounded by a water jacket in which coolant liquid circulates to cool the engine. While this method is widely used in automobiles and large capacity motorcycles, there are very few examples of motorcycles of this class due to increased weight from components such as radiators. R15 version 2.0 uses a special compact and lightweight aluminum radiator and a body design that utilizes airflow for heat dissipation. This has enabled us to create a lightweight, compact body while retaining its stable performance.

The benefits of using this method include stable performance during long-distance, high-speed riding and hill climbing. A liquid-cooled engine does not need heat-dissipating fins and therefore the engine is able to deliver its best performance without being affected by temperature. Additionally, because the head and cylinder are enclosed in a water jacket, mechanical noise from the engine is reduced dramatically. The newly developed engine delivers agile riding performance, and excellent performance on straight stretches of road as well as on winding roads. R15 version 2.0 also delivers excellent environmental performance. These traits are a must for an “urban supersport.” The ride is unprecedented in terms of both excitement and quality.

Cylinder

The Cylinder was born from Y’s world-class aluminum die casting technology.

Cylinders are all-aluminum cylinders made by Y’s proprietary aluminum die casting technology. An aluminum alloy with 20% silicon content is used to create a very hard, reliable cylinder surface, making conventional iron sleeves obsolete. As a result, the entire cylinder can be made of aluminum, a better conductor of heat, which means the cylinder delivers better heat dissipation and less weight. (Aluminum’s heat conductivity is 3.1 times that of iron.) YZF-R15 is equipped with this all-aluminum cylinder called the Cylinder and a forged piston, the same type of piston used in Y’s supersport bikes.

The fact that both the piston and cylinder of R15 version 2.0 are all-aluminum ensures excellent heat dissipation, eliminates heat-induced engine power loss, and helps improve fuel efficiency. The DiASil Cylinder is given a special surface treatment to prevent oil evaporation from the cylinder’s surface and improve oil consumption. The cylinder also has excellent hardness and is considerably resistant to wear compared to conventional iron sleeves.

Additionally, the piston 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. Resulting in an invigorating feeling when revving up. Conventional pistons are typically made in a casting process where molten aluminum is cast in a mold. Y developed its proprietary “controlled forging technology” in 1997, which enables mass production of forged aluminum pistons. These pistons have been used in sport models such as the R series. The same manufacturing process was used to develop R15 version 2.0. Forged pistons retain the excellent strength of aluminum alloys because the metallurgic matrix of aluminum is not affected during the fabrication process. Therefore, the piston can be made lighter and thinner.

YZF-R15 version 2.0 is packed with state-of-the-art technology that is used in the world’s supersport bikes.

Fuel Injection

Fuel injection is used to ensure excellent fuel efficiency as well as environmental friendliness.

The two components of the fuel injection mechanism used in R15 version 2.0, a) the sensors that gather information on the engine’s operation, and b) the fuel supply system that supplies gasoline, have both been designed to be lightweight and simple. The sensor component uses only 4 sensors (Red blinking points) to gather large amounts of information relating to engine operations, which is sent to a small 26-pin ECU, which in turn calculates the optimum fuel supply. The fuel supply component consists of a small, fuel pump, modularized regulator and filter, and a small injector, all of which come together to enable a lightweight, compact form. The injector injects finely atomized spray of fuel through 6 hole type injectors.

In order to maximize the efficiency of the fuel injector, which injects the optimum amount of fuel for different amounts of intake air, R15 version 2.0 is equipped with a large 3-liter air cleaner. The duct area of the intake duct was designed optimally to optimize the flow of intake air.

Additionally, the use of a 4-valve combustion chamber (a combustion chamber with 2 intake and exhaust valves each) has allowed designers to layout the spark plug at the center of the combustion chamber for better flame propagation. This also increases the total valve area relative to the 2-valve chambers for improved intake/exhaust efficiency (volumetric efficiency). R15 version 2.0 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.

In addition, the intake and exhaust valve angles have been kept small to achieve optimum combustion chamber configuration. We also aimed at minimizing the surface area/volume ration (S/V ratio) in the combustion chamber, which is key to improving fuel efficiency. In conjunction with the fuel injection system, this combustion chamber contributes to comfortable riding during long-distance rides as well as during medium to high-speed riding.

YZF-R15 version 2.0’s engine delivers excellent response, fuel economy, is environmentally friendly and a comfortable ride.

LED Taillights

LED taillights adds cadence to the styling. Long-life LED lamps are adopted to help create a rear view suggestive of the super sport class YZF-R6 model.

New tail cowl

The exterior parts from the side to the tail cowl have been designed to create a dynamic leaping appearance toward the rear that gives a sense of cadence to the body lines. A dynamic line of carbon coloring is added along the fuel tank and lower edge of the seat that accentuates the mechanical look.