Tractor Supply was opening a new store and the local antique tractor club was asked to display a few tractors,  so  I took the Hart Parr 70 up.  I had loaded it the day before when it was warm and the old machine started right up after sitting most all winter.  Good!  
  When I arrived at TSC in the morning it was 2 above zero. It would not start. It had no spark. Dang!  <!-- s:( --><img src="{SMILIES_PATH}/icon_sad.gif" alt=":(" title="Sad" /><!-- s:( -->   I had already unloaded it from the trailer (towed it off.... dumb move) so left it sit for the day. Late day I went to try it and it started right up. It had warmed up to +22. Anyway, when I got home I left it on the trailer for the night and tried it first thing Sunday morning.... same problem. When it warmed up later in the day, it started fine. 
  Why would the temperature affect the Magneto?  <!-- s:?: --><img src="{SMILIES_PATH}/icon_question.gif" alt=":?:" title="Question" /><!-- s:?: --> 
This is a new one on me.  Thanks for any help on this.
            Cal