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Honda made both sizes, 700 and 750, for the US. The issue with the early engines was related to the way that Honda chose to make the bores for the cam bearings. They weren't line-bored, so they had some with the wrong clearances. Those with large clearances had problems. There were several "fixes" from increasing the top end oiling to changes in the cam shafts, to changes in the valve adjustment tools, changes in the oils used and oil change intervals, etc. It supposedly helps to warm them fully before riding.
JR
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