Maybe very close but not perfect, look carefully. In my experience, the KTM knuckle is a bit more narrow, and is not forced into the taper of the GG kick shaft before becoming flush on the outside. The splines are an OK fit but a but not as snug as the GG starter. Result is it will not tighten up. Answer is to shim the rear of the knuckle. Yamaha YZ starter is a better option.