How do you change choke cable on 1998 evo motor 1340cc harley Davidson?

Not really a choke on the CV models. It is, instead, an enrichner valve that adds more fuel at idle until the engine has warmed. If not closed bike will continue to idle at a higher RPM and may foul the plugs.

To change the plastic nut must be loosened and the cable unscrewed from the body. Replace with like . . . all there is to it. You may have to remove the carb on some models to access the fitting. Do not overtighten the plastic fittings upon re-installation. Check the fuel line inlet elbow while you're at it to ensure it is not cracked (common issue). If cracked, grip the elbow in a vise and turn the carb body, thus pulling it out. Tap in a brass replacement ensuring the elbow is at the same angle as the original (mark with paint pen before removing original).

Good luck.