Hello, I have a 74 CB350 That I recently bought. It had been sitting for 30 years. I´ve got it running and have ridden it several times but I have noticed that there is a slight rattle that seems to be coming from the gear box. I thought I might drop the oil pan and see if I can see anything. I´ve heard a rattle can come from the cam chain but this is more in the gear box area. Anyone have any ideas s to what it might be.