The '78
/Two late model 550's were built in sequence with each other and contrary to past belief, the late models ('77 and '78) have some distinct advantages over the earlier K-series machines. Through weight reduction and improved seating position, this machine, even with its press-fit pilot jets slightly drilled, and hardly a step up on the main jet, the late model carburetors on this bike offered tremendous performance advantages with only slight modifications. This bike was the second built in a short run of the 2012 black series.
