the 600 conversion isnt easy .
i did it a few years ago
if you were to do it if i was you buy a cbr 600 fl not the parts but the hole bike as the conversion is like re-framing the 600 not making the 400 faster .
as you want the 600 to handle better ...

Guys, Is yakama the only person in the entire uk the only person to have a genuine nc23 air tray? I need to get a mold made of one as they are as rare as hens teeths, And I want to try one on my bike