how much hp does a 1983 kawasaki kx 500 have?

Somewhere around 45 hp is right. 65 would be dangerous in that kind of bike, no matter if your name was Roger DeCoster.

Other bikes with similar HP would be a Honda CR 500 and other 450-500 cc two strokes.

It really doesn't matter about a couple hp but how you ride it.
 
Depends how the engine condition. stock or modified engine.

I only found for 1986 KX500 information. I cant find 1983.

for only 1986 KX500 is
46 horsepower engine.
41 ft lbs of torque engine.

I had experience on my 1983 yamaha yz250. There is big different between stock and modified.
When I modified the bike. ( FMF ported. Mill cylinder head, Kustom Kraft racing pipe. Racing fuel. ) I was raced with it. I said whooooahhhh. That felt like twice power. and more rpms. faster than stock bike. I am so stupid that I sold it. I am very upset and still want it back. Never found it
 
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