my lifter was not near as bad as yours, mine was scored a little on bottom from not rotating in lifter bore. cams and lifters were put in set valves to 0 clearance , ran engine
and still had more top end noise than i thought should be there. I rode down the road at about 20mph at about 2000 rpm and just seems to have more chatter on top than
another venture I rode. so Idecided to double check what was just done and found front cylinder intake lifter not rotating.yamaha has not gotten back to me for an idea of
what to do next