![]() ![]() The head was cast totally different to the production ones. Probably as an R&D exercise for future 4 stroke engines. Surprizingly Yamaha Japan had accepted Withams challenge to produce a new head. Still, from Roberts: ‘Best thing I ever rode’ Shell Thuets eye for detail and reliability was missing too. ![]() ![]() Kenny Roberts lost the AMA Grand National Championship to Gary Scott. The OW72 (I have seen these called OU72 and OW72-this would indicate 2 separate programmes-as far as I know this was a 1 off so I will, for continuity, use OW72) was developed. The legendary dirt track battles between Yamaha and HD highlighted these limitations to the extent that for the ’76 season USYamaha brought in Tim Witham. ![]()
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