I suspect that lots of people have fuel mileage issues, smoking, noises, and other stuff which comes from either a bad spray pattern or from holes in the prechambers being clogged...but I seldom hear of anyone wanting to pull the prechambers to clean and inspect...it does not help to have a perfect spray pattern that is messed up by clogged holes in the prechamber.. they both have to be right to have things right at combustion time.... Greg