My 99 has some lifter tick if it's sat for a week. I think the oil drains out of the HLA's and it takes them a few minutes to get pumped back up. If the bike you're looking at has run for several minutes and it's still ticking, It could have a bad HLA. I wouldn't be surprised if you ran it around the block it went back to normal. If it didn't I'd think it was something permanent. Maybe not serious, but something that's not going away.