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Thanks Weasel1984; your far left pic. tells me it's a 1975-76 Honda CB750F1 Super Sport. Link to "gvhclassicmotorcycles.co.uk" The motor is most certainly CB750. The aluminium rear brake lever bracket and the rear disk brake fluid reservoir just behind it (regular 1st generation 750's had rear drum brakes) make it a 1975-76 750F1 Super Sport. The 1977-78 CB750F2 motor is the same but the rear brake lever bracket is much bigger.