Yes, it is generally okay to use the engine brake (also known as "downshifting") on a 4-stroke motorcycle. Engine braking is a technique where you downshift to a lower gear and let the engine slow the motorcycle down, instead of solely relying on the brakes.
Four-stroke motorcycles are designed to handle engine braking without any issues. In fact, many riders use engine braking as a way to slow down or control their speed in certain situations, such as going downhill or approaching a turn. It can be particularly useful for maintaining control and stability while descending steep slopes or navigating tight corners.
Relying solely on engine braking for deceleration can put excessive strain on the engine and transmission components, potentially leading to premature wear or damage. It's best to combine engine braking with the appropriate use of your motorcycle's brakes to ensure safe and effective slowing or stopping.
Additionally, when downshifting for engine braking, it's crucial to match the engine speed (revs) with the lower gear to avoid excessive stress on the drivetrain. Proper technique and smooth downshifts can help maintain the longevity and performance of your motorcycle. Consulting your motorcycle's owner's manual or seeking advice from experienced riders can provide further guidance on using engine braking effectively and safely for your specific motorcycle model.