First time I'd ever touched a motorcycle, 1974 Honda CB200. Bought for $75, sold for $650.
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After:
1983 Honda Nighthawk 550, bought for $400.
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After:
1976 Honda CB550K, bought with the Nighthawk for $200.
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In Progress (Lots of work left to do):
1974 Kawasaki H1, got for free.
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Current (Lots of work left here, too):
1977 Honda CB750K7, bought for $175.
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After: