Kent He 390 Restoration Co. works one platform. Six model lines. Six production years. Three cylinders, two strokes, no exceptions. The shop was built around the Kawasaki 500cc triple because no other American atelier treats it as a discrete discipline — and because the machines, in their original trim, are simply not rideable.

The 1969 H1 Mach III set the template: a 498cc triple with a ten-thousand-rpm powerband, a friction-plate steering damper, and a reputation for biting the unwary. By 1972, the H2 had grown to 748cc and become, briefly, the fastest production motorcycle in the world. The H1R is the factory race variant. The H1F is the street refinement. The S1 and S2 are the single-carb siblings, lighter and more forgiving. We have rebuilt examples of every one.

What we do not do, with respect: we do not work on four-cylinder Kawasaki Z-series machinery. We do not touch modern Ninja platforms. We do not take on one-off customs outside the triple platform. A restoration from this shop is, by definition, a restoration of a 1969–1975 Kawasaki 500cc two-stroke triple.