Did some search here, and not sure if this was covered or not. Anyway, here it is: we did this swap yesterday on my buddys bike. The FZ1 internals complete with caps are a 100% fit into the non adjustable FZ8 forks. We just unscrewed the bottom allen bolt with an impact wrench, unscrewed the top cap, removed the old internals, drained oil, cleaned the fork inside, inserted the FZ1 ones, tightened bottom screw with impact wrench, poured in the oil (Motul 10W fork oil), did some air bleeding, bolted everything back and done. The internals are the same length btw.
We'll see how much improvement this means, if any.
