Yes-Motorboating can also be caused by playing with too high of a pitch center. When the mouthpiece is out too far, then the sax is out of tune with itself. See this article by Steve Duke about lowering your pitch center.
I might have to move near that place - I am having a heluva time with techs. I just paid for a premium overhaul and got the sax last week. I am now into the 'fix it yourself' mode. The first thing I noticed was the neck fit was no better than it was to start with. He said 'Can't you tighten it with the screw?' I replied, 'Yes, but it should be tight enough to play without the screw.' Blank stare. So I got it home (2 hour drive) and put it away. I took it to a practice Monday night and that's when the wheels really began to come off. I found the RH Eb spring off its perch and a rather big leak on the G#. I actually fixed both of those right there with my bare hands. The horn began to come back to life at that point. I got it out the next day and started to go over it with my screwdrivers. I found loose guard screws, loose pivot screws and loose rods. The pivot screws were loose because the key would stick with them snug. Fixed that by sanding back the nose of the pivot screw just a tad - they were very close but not really good. Everywhere I look on the sax I find something else. I had to trim the bumpers in the key guards because the bumper screws were too far out and loose. This is basically the same thing I had to do to my Selmer USA after getting a local overhaul for half price - I may as well have taken the MK VI back to them instead of going out of town.I was just visiting the Sax ProShop/Music Medic yesterday and mentioned I had this issue on B and C with my new YTS-82ZASP even though my tech had recently set it up. Gary said it might be a leaking neck joint and did observe this with his pneumatic tester. I was not aware and thought my neck had a great fit. He fastidiously went back and forth between expander and tester about 12 times and got it to seal perfectly, even with jiggling and screw tightening. There were no leaks or timing problems and now the low notes respond faster and no longer chug. Thanks, Gary!
BTW, the facility is a tech Birdland, amazing tools and gear and various horns, but the expertise and knowledge are principal.
this is one of the best discussed (and least solved) problems on this forum!Occasionally on the lowest notes I hear the sound warbling, like a motorboat engine. What might the cause be?