I went yfz for three reasons. One I have a yfz. That made it easy to duplicate, and keeping spare parts fits more 4 wheelers. Two, is that the a arms, spindles and hubs are cheap and easy to get. There is probably more of those parts out there than there are for any other quad, considering they are the same for a yfz and a 700 raptor. Three is that I'm really not that big of a fan of 250r honda feel. My brother has one, and it's fine, but I don't see what the big fuss is all about. The yfz has more travel, and feels better to me.
The caster has a little bit of adjustment the way I set this up. I have shims between the upper a arm, and the mount so I can shift the top a arm front to back for some caster adjustment to get the feel right. I don't want it too twitchy.
I think you may be referring to the angle that the arms are attached to the frame. I know on the 250r they have that upward angle to them. I don't know what that angle is called specifically, but it's not caster. Caster is how much tilt there is in the knuckle itself. I can see where that angle (whatever it's called) would help to smooth out the ride........but so do Elka triple rates
