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ok, pdf att. (hope its ok?!) key points, steering head angle 26 degrees, frame tubing 25x2mm, trail 100mm, wheelbase 1395mm. Author states that...
have seen only one drawing (lacking dimensions) of the 900ssie frame, it's on page 178 of this book: (it appears similar to the carby frame save...
yep, suspect corrosion in the micro switch or maybe the wiring is crimped / damaged, great to hear you're making progress.
IIRC no year data for engine, my 1992 EG: "ZDM904A2****" Frame "ZDM906SC2*0000" year and country of sale can be found if you know how, I don't....