AT crankshaft with stroke increase to 80mm for KTM LC4 E-Start Model: 98 to 2006. Incl. Foot plate 1mm ALU and fine balancing (if using your own piston, please send this or weight) Improved torque curve and smoothness. Displacement increase from 625 to a true 640 cc. Please send us your old crankshaft in advance. After checking the old part, we will send you an order confirmation by e-mail.