Hi, not sure how my Email was picked up by this forum? i was sent a notification on the question Tony was asking about the H2 ZXR fitting into a H1 frame. simple answer is yes totally the only difference between an H1 & H2 is the topend internals ( an H2 motor is an H1 with the factory race kit basically) and the swingarm H1 is braced, H2 isnĀ“t plus its a kilo or two lighter. externally an H2 engine is identical to an H1 so is the chassis