Same thing with my 06X2 with the stock 13.7x17 prop. Just alot of weight to push with that prop I think. I propped down to a 14.5x14.25 and no mo vibration.
'06 X2 MCX
"I understand why some people may not want to do this the way I have recommended but I can't understand the death grip some people have on a toilet plunger with a hose fitting." -JimN