White-green smoke?

[Black400]

When i rev up the motor and then i let off the throttle and rpm's start slowing whiteish-green smoke start coming out of the pipe. (i just replaced the gaskets on the top end) What could this be could it be some gasket sealer that got inside and it is just burning off? :confused:

[YZROOSTINYA]

if its blue its oil, i have never seen green, maybe its the sealer, as long as it only did it for a short period i wouldn't worry about it unless it does it all the time