Same here Barnett Kevlar fiber discs.
My buddy has them on his KZ 750 and it's got a BUNCH of miles on that clutch pack. The bike has 40K mi.+ on it and I believe it has only had the stock pack and only ONE set of Barnetts. If anything they are durable! I can't remember,but his may have came with one more disc than stock? Some kits used to come like that,but you had to get another factory plate to add in the pack.
The first thing you will notice though is the drag/pull.
When his was new and you stopped at a light/stop sign you either had to keep the brake on or physically hold the bike back from trying to roll through the intersection. Also when you go to start the bike it may jump forward as well. His bike still does these things,but not as bad since the pack/springs are more worn in.
Don't know,but the regular Barnett fiber discs may not drag as bad?
Edited by - coolatula on Nov 17 2007 11:11:36 AM