The B33 again.  Took it for the second "shake down" run.  The primary drive seems OK for now, but I ain't convinced that the pulley will stand the test of time.  A few minor niggles which can be easily sorted . .  the big snag is the transmission.  There's something which feels like a bearing picking up, and so far, despite pulling the bike apart again, I can't find.  Just for good measure, the bike threw the exhaust push rod whilst coming home.  Ah well, no one said it would be easy.