Could I suggest that you re-post this on the M3W section of this site? There are loads of early adopters with a great deal of knowledge there. But yes - the initial compensators seem to have failed regularly. As for the NVH kit, some have felt that it has done more harm than good and that the upgrade produced by Phil Bleazey (you will find the threads) is superior.
If they have not been upgraded, check out the sprocket, chassis strengthening, lower wishbone, Centa Drive (or Bleazey alternative), replacement of crimped hose/line clamps, and exhaust bobbins. There are no doubt others that slip my mind, but the experts in the TM M3W area will put you straight.
