Surgical Technology Yamaha R25

After last week already invited the media to ngetes YZF-R25 engine performance at Sentul International Circuit, Bogor, now PT Yamaha Indonesia Motor Manufacturing (YIMM) invites the media to dissect R25 technology. This is the latest Yamaha sport bike with Yamaha latest technology bradsis.

Problem body and outward appearance ME already been discussed. This special time, ME will only discuss the technology of the engine bradsis wrote. Yamaha R25 equip dubbed Baby M1 is the engine capacity of 249.6 cc, DOHC, 8-valve, 4-stroke, liquid-cooled. This machine has many advantages bradsis, ranging from the transmission, the injection system, intake manifold, the spigot system (valve), combustion chamber, crankshaft (crankshaft), until the crankcase section.
 

On the intake manifold, Yamaha apply Down-draft Intake Manifold. Intake air into the combustion chamber entrance vertically, minimal barriers, making it more efficient. Optimal air supply was also promised by the throttle body is quite large in its class, with a diameter of 32 mm. In addition, different injectors on R25 also bradsis, there are 12 holes. Fuel particles are sprayed even more subtle happens.
Continues into the valve aka valve. Yamaha uses a system DOHC (Double Over Head Camshaft) with Direct-drive camshaft, without using the Rocker Arm. In addition, Camshaft Exhaust Intake dam is also a separate, making the valve movements become more responsive. The degree of slope was also made smaller valve, the goal that the resulting compression ratio can be higher (11,6:1) bradsis. Valve system work like this is called as High RPM Yamaha Engine bradsis.
 
 
To maintain firmness keteng chain, Yamaha apply Half-Tensioner nut. "Part of this not only serves to tighten the chain keteng, but also serves to absorb the force generated in the chain when the engine rpm is high," said Dawn Prime, Service and Motor Sport Division PT YIMM.

For space fuel, Yamaha MotoGP technology still pinned through DiAsil Forged Cylinder and Piston. There are slightly different from the R25 configuration bradsis, namely Cylinder Offset. Body Cylider axis is not in line with the crankshaft. Yamaha claims this can minimize gross sound and vibration, as well as maximize engine power.
 

 
While at the crankshaft (crankshaft), ignition time contrived to 180 degrees. The advantage bradsis not just one. Engine power is so high because the pumping loss which can hinder the performance of the machine is already minimized. Because of the low barriers, the power generated so much leverage. Although vibration is absorbed already in such a way, but Brader n sista can tetep ngerasain typical vibration motor sport on the R25.
 

 
Yamaha also apply 1-Balancer shafts, the secret that makes the engine more compact R25 and make the overall weight of so much lighter than competitors in its class. There's more bradsis, namely the handlebars piston / piston (connecting rods). Well aware that Yamaha motors with great power also need a strong piston, so that they make a piston with heat treatment (heating) and quenching (cooling).
 

 
With great power, R25 remains easy to control bradsis, is achieved thanks to the Progressive-Pulley oval shape. Lainny excellence is at the clutch. Although the R25 uses a large clutch size, but still light when the lever is pulled. Provide an advantage for the sista n Brader R25 for daily use, in accordance with the tagline You Can Ride Everyday superbike.
 

 
There's more technology adopted MotoGP Yamaha R25 to the bradsis, namely in the crankcase. Precisely is part of the oil suction. Oil suction is placed at the very bottom of the engine (deep-bottom oil pan). "The goal is when the motor in the tilted conditions, such as when you're cornering, the air will not come inhalation (water bubble). These technologies already exist on the YZR-M1," said M. Abidin, as GM Service and Motorsport PT YIMM.