Right so I have a 1127 powerscreen bottom end which we know is helical and various reports no good after 200hp, I've now picked up a U704 1052 slabby bottom end which I believe has a better clutch basket and straight cut gears, now we come to 1127 gsxr which we know has straight cut gears like the b12, although the mk2 b12 has a stronger output bearing, anyone care to add any experiences