Yes those are a 2" Rox riser. They allow me to use either a 7/8" or a 1-1/8" handlerbar (I went with a 1-1/8" Renthal Twin Wall). I had no issues with cable lengths, but I don't think that you could go much higher without issues.
As far as the Tri-z fork conversion (Mr. Bigwheel will say that I am only qualified to say "It's the CDI stupid"), from what I remember the '85 forks did not require a bearing change for the conversion. On my #2 bike with the '86 forks, I think that I remember Mr. Bigwheel changing the bearings while making the swap. I was spending about 2 hours changing the right foot peg, and trying (with moderate failure) to rebuild the brake caliper while he was swapping forks. I bought a new piston and seals to rebuild the caliper from a '85 Yamaha XT 350, as they seem to be the same as the Tri-z caliper. The Tri-z axle was used along with the hub. I think that the BW spacers are the same as the Tri-z's. The bigwheel front wheel can also be used with this setup.
Cliff h screwed with this post 02-24-2013 at 11:33 PM