I really wanted to build a 750. I'm not all that inspired to build a 600cc street tracker. The GR650 has the same power as the TA and it weighs less so I don't think the TA tracker would be any more fun to ride. Although it should have better off road ability. I've found the GR doesn't take to catching air very well (yes, that's oil all over the ground.)
I'm really disappointed that the VT750C engine won't work. I think this engine looks great.
Anyone know where i can find a cheap Africa Twin?