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Speedo drive wheel rpm (usually front wheel on these 60s Jappas). Even Honda 90 speedos of the time had the same.
Any reasonable Twinjet back in its day would just hit 70mph.
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Pete
Honda XL1000V, Suzuki DR650, Adventure Royal Enfield, OSSA Explorer, first model XL250, 9 other offroad, road, and roadrace bikes
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