so... bought this motor and have run it two race days and a practice and my front bearing was toast.. leaking oil everywhere. clutch was totally full of oil lol.
i wonder if the clutch on my nt1 was compressing the bearings together which caused the front one to prematurely wear?
i tried swapping the bearing with one i had from my old 12tz which was still perfect. easy swap but the same symtom when i reassembled the clutch. less, but still gritty.
installed a xray 0.1mm flywheel shim behind the front bearing on the crankshaft which seems to have fixed the problem as the bearings are no longer under pressure.
i thought maybe i tightened the clutch nut too much but dunno.
anyone else have any issue like this?
thankfully i had a bearing that would work. otherwise id be out of racing this week! guess ill get a ceramic front bearing for replacement.