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casting issue?

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    Is this Bad? 1971 CB750 K1

    Hello, I am working on my grandpa's 1971 CB750 K1. He bought it in 1971 and used it until about 1985 when it sat in a garage on a dirt floor. Surprisingly, there is very little rust and the pistons aren't stuck. The kick starter turns over just fine. I haven't tried starting the engine yet but I...