No, motorcycles do not release gas when shifting gears. Shifting gears on a motorcycle involves engaging different ratios within the transmission to match the engine's speed and load to the desired riding conditions. This is typically done by using the clutch lever to disengage the engine's power from the transmission momentarily while changing gears.
While shifting gears, the throttle control is adjusted by the rider to maintain a smooth transition between gears. When upshifting (changing to a higher gear), the rider typically rolls off the throttle slightly as they pull in the clutch lever, shift the gear lever, and then gradually release the clutch while smoothly rolling back on the throttle. When downshifting (changing to a lower gear), the rider may need to blip the throttle while simultaneously pulling in the clutch and shifting to a lower gear to match the engine speed to the new gear ratio.
It's worth noting that some motorcycles have advanced technologies like quick shifters that allow for smooth gear shifts without the need to use the clutch or roll off the throttle. However, the basic principle remains the same: there is no gas release during the shifting process.