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The pregen clutch uses plastic thrust bushes, they are supposed to reduce the slap between crankshaft primary gear & clutch gear ring. Unfortunately it’s a sh!t design, so the bushes compress & harden, then the clutch sounds like a wrecked bottom end, loud knocking noise. Best thing to do is replace it with a new gen clutch, which uses springs as buffers, like almost every other clutches on the planet. It makes it so much quieter. If you are really keen the 300 slipper clutch will fit too, but you need the 300 side case as well, due to it being a bit wider than the 250’s. Either of these doesn’t make much difference to the riding experience, except when stopped the engine doesn’t sound like it’s broken. The 300 slipper, is extremely light at the lever & gives you back torque limitation, so stops the rear wheel locking up if you down change to far when braking.
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