I agree, move on.
However, if you want to know what to look for. head over to google.com and type in Suzuki forum. ask there.
while there's like 3 bike riders in this forum that might know things about different bikes, when it comes to common 98 750 issue none of us are going to know.
Look at the bike, does it have 2 wheels? is the chain still there and not rusty? are the sprocket teeth worn bad? does it idle ok? all we could do is basic check list.
Nothing like, well the 98 had a known problem for front fork seals, make sure you check those.... I have no clue.
again
google > suzuki forum > search button "1998 750 issues"