Agrees with Bryan. We have had minor leaks on these on un refurbed engines regularly and it is always the sealing washer that is to blame, not the torque of the nut. Never seen a torque setting for the nut. In fact, thinking about it even my CB550/4 mongrel which has had the engine re built had a weep, so we replaced the washer again then it was all ok. It is a very leak prone area 🙄