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               Originally Posted by 
              Bartosz  
              Just research and find out it's crank shaft sensor (???)
              Strange. Very strange.
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         That sounds about right. I had an old NX650 that showed the same erratic starting issue and it turned out to be a dicky crank sensor/pulse generator. Trouble was in the old days it took ages to find the problem - thankfully now FI bikes tell you!