KAWASAKI KH250
The KH250 triple didn't get much in the way of upgrades, staying largely the same throughout production. The triple engine is a beggar to keep running smoothly – Kawasaki sold them new with an under-seat box for spare spark plugs.
The teen hooligan's steed of choice, the KH had a reputation for evil handling, which was undeserved and only really applied to the 250s bigger brothers. Pay £4000-£7000.