On both my CX there's a small guide-clamp attached to the upper left front engine casing via one of the M6 bolts.
Number 6 on here,
http://www.cmsnl.com/honda-cx500a-1980england_model16465/partslist/E09.html
Clamper Cord.
This holds mine away from the fan.Then I just route it any way it will go to fit nicely.Much easier in my case as I don't have the Fan guard or mechanical fan in the way,
http://www.pdsrecording.site90.com/cxgl500/Efan.htm
If you don't have the clamp you can make one out of an old piece of Jubilee clip much like the ones I made for my Clutch cables,
Number 6 on here,
http://www.cmsnl.com/honda-cx500a-1980england_model16465/partslist/E09.html
Clamper Cord.
This holds mine away from the fan.Then I just route it any way it will go to fit nicely.Much easier in my case as I don't have the Fan guard or mechanical fan in the way,
http://www.pdsrecording.site90.com/cxgl500/Efan.htm
If you don't have the clamp you can make one out of an old piece of Jubilee clip much like the ones I made for my Clutch cables,
