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I'm new to Buells and have been working on a X1 lightning.  I was having a hard time getting it started when I did a spark test and notice no spark to the rear cylinder.  It has the "racing" ecm and after going through the service manual I wasn't able to find the problem.  In the mean time I ran the battery down so had to charge it to keep trying.  After charging to 100%, I had spark!  I then replaced the battery with a new one and after charging, the bike fired right up.  The issue is, the battery needs to be at or near full charge or I lose spark in the rear cylinder.  Is this normal for these bikes?