It was pretty easy. I pressed out the nsr stem( very easy and I think the best way to do it is on a lathe, by turning off the weld, then using the centre to puch it out with a bit of bar!), then had some custom yokes made up. They weren't massively expensive, and allowed me to keep the nsr geometry correct. The trick is to keep the fork offest at 35mm. The ZX yokes are 20mm... That would make the bike steer like a pissed up crack whore... Or maybe a chopper.

Anyway, once that's done, you can just bolt on the front end as normal. I used a ZX wheel so I'm using a 120 front, but I have a 5.25" rear wheel too, with a 165 rear, so it's effctively 250GP tyre sizes. I primarily chose the ZX front end because of the tiny disks, which keep with the 250 style and are massively powerful anyway. I'd have preferred to stick with a CBR-RR front end if I could, but the disks are huge and pointless.

I haven't changed the geometry at all, so it handles as a goo one should, and I'm quite heavy at a 100Kg, so I haven't changed the internals and it feels great for me. I like it quite firm at the front anyway and it's just that but still supple. Allows you to brake like a biatch too.
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NSR300R - Why did i ever have a 250...