What causes blue or white smoke under deceleration?

Blue smoke is usually caused by oil getting past the piston rings and burning in the combustion chamber. If you notice blue smoke during acceleration or on deceleration, check your engine oil level. If it is low, then you need to replace your piston rings and inspect the cylinder walls for any damage or blemishes.

WHITE SMOKE

White smoke could mean coolant is finding its way into the combustion chamber, which can cause overheating. If your bike has been running hotter than usual or running with the radiator fans on all of the time, check your coolant level. If your oil looks like a latte, then you have a coolant leak. A bad head gasket is probably the culprit and needs to be replaced.