More differences between the pre-mass production models and 00001-004?? Another air box shot, Horn mount has only one bolt, Swingarm has a bolt instead of a rubber plug in the oiler, and front brake arm.
I think the preproduction prototypes were 350s. What I am calling prototypes are the early hand produced machines that were sold in the States. Some sample differences are below. The K instead of Kawi spelled out in the side covers, right hand shift spline in the clutch cover.
Kawasaki Kt250 Prototypes
in Classic Trials
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the question may be pre production kt250 models (500 made) versus what the true prototypes were.