Propeller bubbles

[ch_eng]

I was wandering of anyone could answer my query. I have Yamaha 225HP and when it is idling I notice that bubbles are coming out from the propeller area. I have a vague memory that someone once told me that this was an indication of some sort of restriction in the exhaust system.... however I may have just dream´t this!!! if anyone has any information about this, your advice / thoughts would be greatly appreciated.

 

[MIDNIGHT EXPRESS]

Does this happen in gear idling or in neutrule??

 

[Jerryjerry05]

Normal.
That's the exhaust comming from the motor.It exits through the prop under water.If it came out anywhere else it would be too noisy.