I tried posting this in the " Old's Cool" tread but no replies. Does anybody know any details on this model bike? I came across this early 80's 4stroke KTM GS500, it needs to be restored as the timing belt broke so engine needs a rebuild . They are asking $600 but I was thinking of offering $400 but I cant find any engine part parts available. Does anybody know a parts source for engine parts? Any thoughts? Its very possible its just not worth the headache. How would this compare to a CR500 honda ? Any replies appreciated.