Coming to a stop in 2nd or 3rd gear on a bike should not cause any immediate damage to the bike itself. However, it's important to note that it's not the most ideal way to bring your bike to a complete stop, and over time, it may result in some wear and tear on certain components.
When you stop in a higher gear, the engine will continue to rotate at a faster speed than it would in a lower gear or when idling. This can put additional stress on the clutch, transmission, and engine components. The clutch may experience increased wear because it needs to transfer power from the engine to the transmission while the bike is stationary. In addition, the engine may struggle to idle smoothly in higher gears, which can cause it to stall.
To minimize wear and tear and promote smoother operation, it's generally recommended to downshift to first gear when coming to a complete stop. This allows the engine speed to match the bike's speed, reducing strain on the clutch and transmission. However, it's worth noting that modern motorcycles are designed to handle a range of riding conditions, and occasional stops in higher gears should not cause significant damage. Just try to avoid making it a habit and downshift when possible to ensure optimal performance and longevity of your bike.