[Shep]

Service the Spark plug caps,



http://globalcxglvtwins.hostingdelivered.com/viewtopic.php?f=8&t=84



Replace the main fuse holder,



http://globalcxglvtwins.hostingdelivered.com/viewtopic.php?f=8&t=27



I would actually ditch your present spark plug caps and get a new pair of none resistor types from Wemoto as per this page,



http://www.wemoto.com/bikes/Honda/CX_500_A/79-80/picture/Spark_Plug_Cap/

and use Resistor type spark plugs as per,



http://www.pdsrecording.site90.com/cxgl500/Plugs.htm



You may have faulty coils so I would renew them as well as per,



http://globalcxglvtwins.hostingdelivered.com/viewtopic.php?f=10&t=335



These are the ones I use from Ray Williams,



http://cgi.ebay.co.uk/UNIVERSAL-IGN...18?pt=UK_Motorcycle_Parts&hash=item4159644bfe





HTH