I have a FZR front end on my bike, I did no stem swapping, all I did was knock the lower bearing race off the CB's (already converted tapered set, and swap it on to the FZR's stem, I then used the CBs, upper bearing, and had to add a washer to fill the stack height out a bit, but other than having to remove the stem lock tabs on the top of the neck, and shortening the tabs on the lower neck to allow a decent turning radius, it was a bolt on affair. Test ridden a total of 50km before my engine poo'd itself
As for the Rear, I have a FZR on as well, I have spacer's made to copy the exact spacing of the Comstar that came off
If you type FZR wheels in search its currently the third thread on the list titled
Just swapped wheels on my 77 CB750F
Oh ya and the front wheel isn't staying purple dont worry!!!
Ok back to work for me!!