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I've had a couple of KEs in my day. They are decent bikes within limitations. A known problem with them is the oil injection system. It was real common for them to fail and cause the piston to seize. Most people would bypass it & pre-mix 50:1.
If it has been in storage, strongly consider replacing the tires, crank seals, brake shoes, cables, and the chain and sprockets. On a KE100, I'd estimate about $200 or less to do all of this if you do it yourself. Not too bad for a frugal motorcycle.
The stock brakes were pretty weak on the KE series, but sanding the drums and using EBC brand shoes helped. Ride defensive and they get the job done.
On older two strokes, the crankshaft seal on the magneto side is prone leaking and will cause it to go lean and seize. An unusually high and erratic idle is the tip off that it needs to be replaced.
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