I just bought a 1984 Honda VF700S, and it has a few problems. When the bike is idling after some time, there is a horid sound like a clunking/grinding then it disapears. Then, when I go to put the bike into 1st gear it lurches forward like the clutch isn´t fully disengaged. The clutch plates are brand new, the master and slave cylinder seem to look good. Is there a trick to figuring this problem out or has anyone ever had this happen before?