Crankshaft 85sx `18-24 Bigbore Ø52, Stroke 52.7, 112cc

This VHM stroker crankshaft has a stroke of 52.70 mm. Together with the OEM KTM 105 factory kit (47649905044) with cylinder bore 52mm, the displacement change from 105cc to 112cc. The crankshaft is designed with a middle inertia for an improved handling and performance and a better balance percentage for less vibrations. You'll notice the high quality, as the runout is within 0.01mm and it can be rebuild many times without losing the strength and stiffness. Important note: Don’t use 105SX piston from the 105 Factory kit, but use instead aftermarket Vertex 112SX piston 23879A You must modify the piston skirt exhaust side to prevent piston skirt come in contact with the crankshaft, see picture for modifcation. Better top over revolutions Better handling Higher corner speed Longevity and accuracy Less vibration