Question: On my IO-550N which I run LOP almost all the time, it runs quite well on the stock injectors.  It now has almost 500 hours and I do not believe the injectors have ever been cleaned.    I am getting some small vibration at LOP now and one or two cylinders are getting colder than the others leaning.  I would like to hear from people with experience on how they cleaned, what materials or ultrasonic cleaner was used and whether they replace the o-rings and where to get them.

Paul
Legacy, Calgary