Just the other day my CB160 motor seized up. Turns out that the cam is pretty much cooked. Seems a lack of oil to the top end was the culprit. It may come out with a torch and some coercing, but who knows. If anyone has a complete head or cam etc. they would not mind parting with I would really like to know.
Also... Aaron, if you have a good source for a bore kit for the 160 could you let me know. I may as well do it right now that I have it apart. Thanks!