Yamaha Jupiter Z

Yamaha Jupiter Z

The piston forging have lighter weights than usual piston. Part of this also is a mainstay in the Yamaha Jupiter-Z racing Kumoro Djati Diaz. With a heavy part penggebuk compression combustion chamber that is lighter, the engine also gets the same treatment.

55.25 mm diameter pistons which supported TDR brands as sponsors of the team, the first podium in the class MotoPrix MP1 at the beginning of Region II of this series was easily achieved by Yamaha TDR Federal Oil FDR Yonk Jaya's NHK.

According to Heru 'Kate' Hardiyanto as Tunner team based in Bandung, West Java was the difference in weight is reduced about 5 grams. "Although only about 5 grams, but it can affect engine performance," explained the man was friendly.

Rev the engine, especially since the rounds down easier dikail. Likewise for the lap top. Rpm, the engine so it can play a little higher.

There are other advantages about the application of this piston. According to the man from Yogyakarta, the temperature of the engine tends to be more stable and cool. "Because of light weight, so the machine does not work more like a regular piston wear," told you in.

Iya dong, crutch does not need to spend extra energy for pushing and pulling the piston. This condition is advantageous, because the engine performance is maintained. Finally, the engine power is not much worn down despite more than 10 rounds.

But, not many adjustments made in the application that created the model forged pistons that. Especially when talking about engine compression. For, unlike the previous piston, the piston has a dome forgings quite short. This condition makes the compression is not played too high. But, just 13.5: 1.

 DURATION 270 º

Create Balance lightweight engine performance, magnets also touched. This time, Heru rely on iron plates are changed so the rotor magnet alias. "Weighing, 475 grams with 350 grams balancer," he said.

This condition makes the engine has a torque greater. Moreover, setting the duration of the camp is supported by 270 º LSA (Lobe Separation Angle) 105 º. Then, the head of the umbrella valve cylinder packed with a diameter of 29 mm / 24 mm. Valve from the understated brand anymore EE diameter. Fuel-powered bursts PWK 28 mm Keihin carburetor. Main-setup jet-jet 112 and the pilot is quite large, namely 62. "Because the motor power lightly, so it took a bit of input in the round bottom," lid Heru is an alumnus of the faculty of Agriculture's 1990 Jojga UPN.