Motorcycle vehicles are very popular because they are easy to maneuver and fast, so they are the most popular in various aspects of transportation in urban areas. However, motorbike drivers get tired easily. Acute fatigue, fatigue, chronic sleepiness, sleep disturbances, and heavy workloads have been associated with reduced performance in psychomotor tests and driving simulators and increased rates of motor vehicle crashes, injuries and deaths in certain populations. One that must be considered is the spread of vibrations originating from the piston motor. This is due to vibrations occurring in the work environment and distributed to the body of the workforce or objects in the workplace or work environment throughout the body in the form of mechanical vibrations originating from machines or mechanical equipment. Therefore, the purpose of this study will be to determine the effect of port placement on the intake and exhaust channels on vibrations throughout the body (Whole Body Vibration). Tissue resonance throughout the human body causes health problems. The standard or threshold value for the whole body vibration level that applies at the international level refers to ISO 2631. The test results on the driver’s arm with a rotational speed of 9900 rpm at the standard obtained a frequency of 6 Hz and an amplitude of 0.911137 mm/s2, after porting, the frequency is 7 Hz and the amplitude is 0.771992 mm/s2. Meanwhile, on the driver’s feet with a rotational speed of 9900 rpm, the standard obtained a frequency of 3 Hz and an amplitude of 12.0214 mm/s2, after porting a frequency of 3 Hz and an amplitude of 18.6765 mm/s2 was obtained. The results of this study can be concluded that the use of ports on motorbikes will cause riders to experience fatigue more quickly than standard motorbikes. Because the average ported has a greater amplitude than the standard conditions

After COVID, activities for motor racing championship competitions have increased year after year. As a result, an engine change is necessary to compete in motor racing events because utilizing a factory standard engine will not produce the best results. It basically has to be modified on the machine because factory standard machines have standard speed and are not ideal for the event motor racing. The goal of this study was to determine how intake and exhaust channel porting affected the 150 cc Kawasaki Ninja's performance and how the results varied in these areas. The experimental procedure entailed reshaping the intake and exhaust holes in the cylinder block from the intake port, which measured 44 mm to 42.5 mm from the upper lip, and the exhaust, which measured 36 mm to 41.5 mm, and exhaust height, which measured 35 mm to 29.5 mm from the upper lip of the cylinder block, a Dynojet test kit on a 150 cc Kawasaki Ninja 2 stroke motorcycle was used to determine the horsepower and torque data obtained. The results of the standard cylinder block data after porting adjustments to the intake and exhaust holes show that the torque results on the standard cylinder block get data from 19.31 at 6,723 rpm to 21.85 at 8,018 rpm, and the HP results on the standard block get data from 23.49 HP at 6,915 rpm to 27.92 HP at 8,584 rpm. The results of this investigation suggest that power and torque can be increased by changing the intake and exhaust ports. Engine performance will be impacted by increased power and torque. The process of adding ports to the intake and exhaust is only getting started with this research. Therefore, more study is required. In order to achieve the best power and torque outputs for the demands of motor racing, research can be conducted by creating porting adjustments