The improvements for the Mk1 Star (CHI-395-6) appear to be a heat shield between the engine and fuel tank, a thick angled guard ( shield) to protect the bottom of the carburetor and air cleaner elbow, a modified tank with boss to accept carburetor guard, and an improved adjusting mechanism for the governor link.
While the handbook for the PU-5008/U claims that they are modified CHI-395-6, I have observed a number of local examples that do not have any of the CHI-395-6 features, which would indicate that they were modified from early CHI-395 types.
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