Jimmy Lewis shows you the steps to replace the sprag gear (starter clutch) on a newer KTM EXC. From diagnosing the bad clicking sound to doing the full repair and showing the necessary tools, this is basically a step-by-step process.
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definition: A sprag clutch is a one-way freewheel clutch. It resembles a roller bearing but, instead of cylindrical rollers, non-revolving asymmetric figure-eight shaped sprags, or other elements allow only single direction rotation. When the unit rotates in one direction the rollers slip or free-wheel, but when a torque is applied in the opposite direction, the sprags tilt slightly, producing a wedging action and binding because of friction.
