I know this is a popular mod on the zrx and alot of guys ask alot of the same questions. I thought I would post up some pics and details of what is required to make one of these fit. It is really quite simple. I currently have one of these on my bike but it is +6 over and I'd like to have a stockish length arm for playin around with... so here ya go.
This arm is off a 03-04 zx6. I picked it up from another member here and it came complete with the axle, blocks, linkage, caliper, bracket, MC, basically everything but the wheel. I already run the zx6 wheel so this should be simple.
First step. unbolted the linkage. it's getting cleaned up of any extra tabs and BS that the zx used. I chose to use the stock dual shocks.... so the linkage mount got milled off. everything smoothed out and you can't tell it was ever there. the top side had a hugger mount as well.... those came off as well. I am going to leave the chain guard mounting tabs for now. I don't know if the stock guard I have will be close but it's easy to cut them off later than to remake them. here's a few pics
You don't HAVE to remove the linkage mount, as it's on the bottom of the arm and isn't really in the way, but I like the " should have been factory" look. the hugger mounts (atleast the center ones) will be VERY close to the under side of the stock storage compartment. I've already modified mine for the longer arm but those with stockers will notice a close clarence.
next the roller bearing and pivot bushing are removed and the rex one is going in it's place. I belive there is a spacer that is going to be reused from the rex as well. The needle bearings will be replaced when I'm all done as they have to come out to get it PC'd but for mock up... they will be fine.
so far that is all I got... more to come.....