My asp 91 4st just craped its bearings after a grand total of about 1 1/2 hrs . They look very cheap and if its all good after the replacements are in Ill still be in front . Other than this slight setback its run faultlessly [:-] .No dramas with my 3 other asp - magnums . I have replaced the bearings in my 25 2 st and I.I.R.C. they didnt look like these ones and lasted way longer . Cheers the pope