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Features of R15 2.0

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Liquid-cooled

First Indian made model with cooled Engine. Liquid Cooled Engine provides 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. YZF-R15 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. YZF-R15 also delivers excellent environmental performance. These traits are a must for an urban super sport. The ride is

unprecedented in terms of both excitement and quality.

Engine:-

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DiASil Cylinder

The DiASil Cylinder was born from YAMAHAs world-class aluminum die casting technology.

DiASil Cylinders are all-aluminum cylinders made by YAMAHAs 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. (Aluminums heat conductivity is 3.1 times that of iron.) YZF-R15 is equipped with this all-aluminum cylinder called the

DiASil Cylinder and a forged piston, the same type of piston used in YAMAHAs super sport 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. The DiASil Cylinder is given a special surface treatment to prevent oil evaporation

from the cylinders 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. YAMAHA 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 YZF-R15. 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 is packed with state-of-the-art technology that is used in the worlds super sport bikes.

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Fuel injector:

Fuel injection is used to ensure excellent fuel efficiency as well as environmental friendliness.The two components of the fuel injection mechanism used in YZF-R15, a) the sensors that gather information on the engines

operation, and b) the fuel supply system that supplies gasoline, have both been designed to be lightweight and simple. The sensorcomponent uses only 4 sensors (Red blinking points) to gather large amounts of information relating to engine operations, which issent to a small 26-pin ECU, which in turn calculates the optimum fuel supply. The fuel supply component consists of a small, fuelpump, modularized regulator and filter, and a small injector, all of which come together to enable a lightweight, compact form. Theinjector 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 intakeair, YZF-R15 is equipped with a large 3-liter air cleaner. The duct area of the intake duct was designed optimally to optimize the flowof intake air.

Additionally, the use of a 4-valve combustion chamber (a combustion chamber with 2 intake and exhaust valves each) hasallowed designers to layout the spark plug at the center of the combustion chamber for better flame propagation. This also increasesthe total valve area relative to the 2-valve chambers for improved intake/exhaust efficiency (volumetric efficiency). YZF-R15 is fittedwith a hemispherical 4-valve combustion chamber, a configuration that allows intake and exhaust valves to be laid out in the smallestsize 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 fuelefficiency. 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-R15s engine delivers excellent response, fuel economy, is environmentally friendly and a comfortable ride.

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Delta box Frame

The frame, which forms the basis for riding comfort and handling performance, is a Delta box frame which delivers superiorrigidity balance.

This frame was designed to provide the best balance in longitudinal, lateral, and tensional rigidity. The synergy created by

optimizing each dimension delivers a solid riding feel as well as comfort and agile riding performance.The Delta box frame was commercialized based on the experience and know-how accumulated through YAMAHAs

involvement in Moto GP since the early 1980s. This type of frame is currently used in YAMAHAs R series of sport models. The

engine is mounted on rigid supports; one on the head side and two on the case side; so that the engine itself becomes a structuralmember contributing to body strength and rigidity. The engines low vibration makes rigid supports possible, ensuring low vibrationsand excellent balance of rigidity. Tensional rigidity refers to the frames resistance to deformation when a twisting force is applied tothe pivot with the frames head pipe held in place.

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Linked type Monocross suspension

YZF-R15 is equipped with a linked type monocross suspension that delivers a comfortable ride and a cushioning performancethat is less prone to bottoming out. In particular, it reduces annoying sinking when riding tandem.

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. When the shock absorber is almost fully extended, the lever ratio is high andtherefore the spring is soft, and the damper works softly as well. As the shock absorber strokes in, the lever ratio gradually decreasesand the spring rate increases. Eventually, when it is nearly fully stroked in, the lever ratio becomes small and the spring becomeshard and strong. The damper also becomes hard. By making changes to the lever ratio in this way, we were able to achieve softriding comfort as well as excellent damping under intense load conditions.

The optimization of the frame and rear arm rigidity of the Delta box Frame combined with the effects of the linked typemonocross suspension achieve good riding comfort, agile handling, and turn ability, hardly ever causing bottoming out.

As the heir to the YAMAHA R series, YZF-R15 has inherited the series agile handling performance.

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Aluminum Swing arm

First Indian made model with aluminum long rear arm which improves handling in the turns. It has a truss structure thatenables greater rigidity. This rear arm is cast in one piece by the gravity casting technique that enables a quality cast with greatfreedom in sectional thickness.

The chain adjustment assembly at the end of the rear arm is the same type used on Super sports models to improve

adjustment capability.The long swing arm design is a feature fed back from Yamahas YZR-M1 MotoGP race machine and it is effective for ensuringoutstanding rear tire traction. It serves to minimize excessive chassis movement when drive force is applied and is thus effective instabilizing the machine.

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Split SeatA separate-section seat enables a better feeling of seat grip in sporty riding. This new seat design features a slip-resistant

seat cover material, excellent cushion qualities, optimized shape for the inner thigh contact area and the cushioned front edge ofthe rear seat that supports the riders rear.

The 800mm seat height lets the rider maintain a more relaxed riding posture, while the shape of the area that contacts theriders inner thighs has been shaped to provide easy leg reach to the ground. The design also features a storage compartment underthe rear seat for holding things like tools and documents.

Wid R di l R T

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Wider Radial Rear Tyre

With a width of 130 mm, the rear tire adds to the sense of machine volume a radial tire is a tire formed around a carcass

consisting of a radial ply with cords that run in a perpendicular to rolling direction, as if radiating out from the centerof the tire to thetwo rims.

The advantages of a radial tire are: (1) a high level of rigidity that reduces excessive flexing of the tread and increases grip

and (2) reduced rolling resistance that contributes to better fuel economy.The rubber compound and tread pattern, the crossing angle of the belts and the amount of turn-up in the radial carcass aredesigned for the optimum mutual balance to achieve excellent handling characteristics.

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LED Taillights

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

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New-design middle cowl

The newly designed middle cowl features improved aerodynamic performance at higher speeds while also giving a moredynamic look to the body styling. The aerodynamic resistance value is 4% better than that on the existing YZF-R15 for improvedhigh-speed performance.

The new cowl is characterized by a layered structure and is designed to actively draw in airflow for cooling effect, while also

contributing to rider comfort by directing the outflow away with greater efficiency.

New tail cowl

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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 senseof 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 themechanical look

Large 220 mm diameter Rear disc brake

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Large 220 mm diameter - Rear disc brake

A larger 220mm diameter rear disc brake has been adopted to achieve a better balance with the new rear tire size andensure good braking power and operability. This larger disc is coupled with the piston-slide type single-pot caliper.

New-design 5-spoke type wheels

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New-design 5-spoke type wheels

Newly designed cast wheels are adopted front and rear. The design creates a 5-spoke image by grouping the ten thinnerspokes two by two to form five pairs. This design achieves the necessary strength balance while creating a sense of lightness at thesame time.

Exhaust System Design

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Exhaust System Design

Exhaust system design contributing to the high performance image. The angle at which the silencer is mounted accentuates the feeling ofupward thrust toward the rear. The newly designed silencer protector adds cadence to overall styling. It adopts a carbon-look pattern on thesurface as well as a model nameplate to add to the high-performance image and the feeling of quality. The design of the end cap is also new

Double Horn

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Double Horn

A double horn with larger volume and sound quality is adopted.

Designer rear mud guard

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Designer rear mud guard

The rear mud guard and sari guard are designed to coordinate visually with the rear fender and they are attached to the swingarm. The sari guard is designed to blend into the overall styling of the rear assembly with its dynamic rearward thrust. This creates agood harmony of sportiness and utility.

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