Part: Honda CB550 / CB500K Ignition Coil
Why You Need This: A number of factors can contribute to a weak spark. If your Honda CB550K / CB550F or CB500K still have the factory coils, there's a good chance they could cause you problems. Coils get old and produce weak spark (dull white to yellow spark versus a bright blue / purple), become intermittent or just stop working all together. These reproduction ignition coils will fit the stock mounting brackets on your Honda CB550 with no modification. Each coil includes two non-removable spark plug wires; coils are sold individually, two are needed per bike.
Might as well change the plugs and boots while you're at it. We have found that two long boots fit well on the cylinders 2 and 3 with the short boots on 1 and 4 (default), but you're free to opt for a matching set.
Installation Tip: Disconnect the negative terminal on your bike's battery before you start working to avoid shorts and other bad stuff. When installing, make sure the connections to the points and the 12 volt power supply are clean and corrosion-free.
The spark plug boots thread into the end of the spark plug wire with a threaded connector. Make sure that terminal is threading securely into the wire itself, and not off to the side into the insulation.