Here is a DUC 999 injector we just serviced for Kai at The Duc Shop..
Came in having after a tank that had sat in a paint shop for a LONG time gunked it all up. The filter basket on the injector was full of crap but lots of stuff got by. It leaked BAD when it shouldn't have and the spray pattern.. well it was a stream to one side not a spray at all. Took a LONG time with multiple sessions in the ultrasonic bath but it came around!
gunk in the filter basket.. replaced the basket.
FLOW? what flow...not much of a spray pattern either.
after about an hour in the ultrasonic bath got it to flow.. but now correctly. Lots of large droplets.
Also would leak BAD when it should hold at 3bar. (40psi or so..)
Can you say "hydrolock"!!
ALRIGHT! Finally.. About 3 hrs total time but got er to flow. This thing moves a bunch of fuel. Big shower of spray from small holes in a circle above a conical tip. Not sure what a Ducati injector costs new but im guessing it is not cheap.