I just finished this '78 CB550, which I had purchased a few months ago in non-running cafe racer form. It had upright bars, stock footpegs, its original gauges and 7" headlight, and a rats' nest of wiring and electrical tape. The forks, carbs and intake o-rings were leaky, and the exhaust copper gaskets were missing,
I had to completely rewire the bike and rebuild the forks, brakes, carbs and intake manifolds. Since it had no switches, horn or turn signals, I removed the starter, hid a Ballistic 4-cell battery in the starter space, and built it as a minimalist traditional cafe bike. The Carpy's exhaust is very lightweight.
I added rearsets (Cognito brackets and Slipstream pegs, levers and linkage), clubman bars, a mini speedometer, and 4.5" headlight. The carb and intake parts came from 4into1.com.
I also laced up an 18" front wheel and used Kenda Challenger tires front and rear.
Runs nice and strong, handles well and feels very light. It'll be for sale in a few weeks,.
