No, engine braking does not typically damage a bike engine. In fact, engine braking is a common technique used by motorcyclists to slow down or control the speed of the bike without solely relying on the brakes. It involves downshifting to a lower gear while releasing the throttle, allowing the engine's compression to slow the motorcycle down.
Engine braking is a natural part of the engine's operation, and modern motorcycle engines are designed to handle this process. When you release the throttle and downshift, the engine's compression creates resistance, which helps slow down the bike. This technique can be especially useful when riding downhill, approaching corners, or when you want to reduce speed while maintaining better control of the bike.
Downshifting abruptly at high RPMs or dropping gears too quickly can put additional stress on these components. Therefore, it is recommended to downshift smoothly and progressively, matching the engine speed (RPM) to the appropriate gear, and avoid excessive downshifting when the engine is at high RPMs.
Overall, using engine braking in moderation and with proper technique is unlikely to cause significant damage to a bike engine. It's a useful skill to have as a rider, but it's also important to understand and respect the limits of your motorcycle's components. Regular maintenance, such as checking and adjusting the clutch, can help ensure its longevity and proper functioning.