I've been a member on the forum for some time, but just found this thread. See my 1975 CB550 K1 in the photo. It's a survivor rather than a restoration, and I've been the owner since 1980. It's the first bike I've ever owned. Some things I've done over the years include: Jardine slip-on mufflers when the originals rusted out. Koni adjustable shocks in rear. Cibie Headlight. Electronic Ignition. Electronic voltage regulator. And most recently an LED bulb for the headlight. If I had done the LED headlamp first, I would not have changed-out the regulator.