Subaru engines are known to leak oil externally. When that oil reaches a hot surface it burns. Hence the smoking engine. Check your oil level when you get gasoline and make sure it's always full. No big worries. You can get your engine steam cleaned from time to time and it should minimize if not eliminate the smoking but only for a time. Be happy that it's not an internal oil leak into your combustion chamber which would equal smoke coming out of your tailpipe.
The main cause of motorbike smoke is when the diesel is being burned and used in the engine. This smoke causes pollution to the environment.
Blue smoke is burning oil.
blue smoke is oil. white smoke is water. black smoke is unburnt fuel
Black smoke from an engine is caused by unburnt fuel.
the engine is burning oil. blue smoke oil white smoke antifreeze black smoke excess fuel
if it is white smoke engine need to rebuilt.
to much of it can stop our system
unburnt fuel
what causes a 125cc motor to smoke and burn oil ? and is it fixable
If the smoke is black it could be caused by a faulty fuel pressure regulator which could be causing the engine to get too much fuel.
You probably have a little oil seeping into the combustion chamber while the engine is off. Once you start the engine, this oil is burned and causes the smoke you see.
The most common is the head gasket. BUTDepending on the engine there can be several other causes.