If you noticed steam-like smoke coming out of your motorcycle's exhaust after speeding for a couple of minutes, it could indicate a few possible causes:
Water condensation: When a motorcycle is running, the exhaust gases can reach high temperatures. If the motorcycle has been sitting idle for a while or the ambient temperature is cool, moisture from the air can condense inside the exhaust system. When you accelerate and the exhaust gases heat up, the moisture turns into steam and is expelled as vapor through the exhaust, resembling white smoke. This is generally a normal occurrence and should subside as the exhaust system heats up and dries out.
Coolant leak: White smoke can also be an indication of a coolant leak. If your motorcycle's coolant is leaking into the combustion chamber, it can produce white smoke as it burns. You may notice a sweet smell along with the smoke. Check your coolant levels regularly and inspect for any signs of leaks or coolant loss. If you suspect a coolant leak, it's important to have it addressed by a mechanic as soon as possible, as running the engine with insufficient coolant can lead to overheating and engine damage.
Engine overheating: If your motorcycle's engine is running too hot, it can cause the coolant to boil and produce white steam-like smoke from the exhaust. This can occur due to factors such as a malfunctioning cooling system, low coolant levels, a faulty thermostat, or a problem with the radiator. It's important to address any cooling system issues promptly to avoid engine damage. Check your coolant levels, inspect for leaks, and ensure that your cooling system is functioning properly.
If you're uncertain about the cause of the smoke or if it persists even after addressing basic maintenance checks, it's recommended to have your motorcycle inspected by a qualified mechanic. They can diagnose the issue accurately and provide the necessary repairs or maintenance to keep your motorcycle running smoothly.