Have to admit I am still learning my way Honda CB350. Looking in the manual I think this must be the first vehicle I have owned that doesn't have a oil filter. Looking in the Haynes book it states it has a centrifugal filter that has to be cleaned but doesn't tell you how to get into in. Had a look on you tube and found an American clip how to remove and clean. Pretty easy once you know but not sure why the workshop manual doesn't explain this. Just finished the job judging by the crap that I removed the last owner didn't know how to do it also.
This is the crud that came out


free photo hosting
Circlip holds the housing in place


Lucky the screw are off set as the cover must go back in the correct position the line up the oil ways

image hosting free