</font><font color="blue" class="small">( Do any other Boomer owners have a problem with your throttle not staying at it's maximum setting? When I put mine at maximum, about 2850 rpm, when I let it go, the throttle moves slightly, down about 100 rpm.)</font>
My TC33D did the same thing when it was still fairly new. The condition got steadily worse to the point where it would drop from 2500 down to 1600 RPMs as soon as I let go. There is a friction adjustment to the throttle that will take care of it. I had mine done by the dealer when it was due for one of its regular maintenance checks.
There is a thread on here somewhere with a description on what it takes to adjust it yourself. I can't find it now, but believe it was also a TC33D.
John Mc