Interesting....I installed the Siron wires today which are HUGE with the plastic coating on them. All are numbered but being the mechanical asshole I am..I replaced them one at a time. The boots snap on the plugs and distributor with the confidence inspiring click you want. What was apparent was that my stock wires were worn fairly significantly in many places, the stock fabric sleeves were compltely worn through in places and the juction between the boots and wires cracked in some. I had no idea this was the case.
The bike is 5 1/2 years old and I just figured I'd replace them for no particular reason...glad I did.
Tim Sirons wires are heavy, spiral core and gorgeous with 1800 degree boots. The price is high ($160/set) but worth the confidence I now have.
Call or e-mail Tim...He is a really great guy and get a set if you are in the market...Joe