^^^^^^^^^
This is the reason I sold my Yerfie... After dropping 1400 on it (including purchase price...most was stupid shop fees because I messed it up... oops) I still didn't do the big necessary spindle/a-arm BDX swap or give it real tires/shocks, but I ended up selling it for a TINY bit less than what I invested so at least I came out pretty well
But yea. Get the BDX ball joints, a-arms, spindles and I suggest the HD rear-engine mount as it's inexpensive and I had the stock one break on my when I had mine. Check out my thread if you want to see what I did with mine.