Royce Creasey when testing a 1980 Jota said if he could fault it for one thing , it would be it`s bicycle frame ancestory ..... ( he was a FF advocate , therefore critical of all contemporary frame design ) ...... As increasing engine performance began to place ever increasing demands on increasingly outdated frames and basic suspension , tyre choice became ever more critical ........ Decent tyres wouldn`t overcome the frame and suspension flaws , but they would help to compensate for some of them ........
Slaters Jotas raced on Pirelli Gordons , as they reckoned the Jotas preferred them to Avon Roadrunners or Dunlop TT100`s .... but that was years ago , and racing bears no relationship to cruising down the road at 80 mph .
As long as the frame is ok and true , wheels are aligned and balanced , and steering head , swing arm , and wheel bearings are all ok , then experimenting with tyre pressures might help ......... but you seem to have already checked through all this .........
Are you sure the wheels are balanced ? ....... Those FLAM wheels weigh a ton .......... If they were out , it might not help .......
( Gene Romero , when riding the TZ750 for the first time , found it went into a terminal feeling weave at around 140 mph ....... He told Yamaha team chief Kel Carruthers , and Kel replied " So what do you expect me to do about it ? " ........
.... Romero discovered that this handling issue was a little like a vibration patch with an engine that smoothed out at higher revs ....... If he kept the throttle pinned , he could ride through the weave , and from that point on , everything would be fine ......... ) .........
.... Better not try that though ........
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