16-10-12, 12:23 AM
Check battery. Even if it's good enough to turn starter motor that doesn't mean it's good enough to make a spark.
Check earth connections to frame are free from corrosion etc.
Check resistance on all relevant wires using multi-meter.
Some handy vids showing how to do these and other electrical tests here:
http://www.youtube.com/playlist?list=PL2...ature=plcp
Hope this helps, Andy.