« Reply #2 on: November 26, 2025, 03:18:12 AM »
I bought one of those 77 CB550 new for my 1st wife in 77 just like yours. It started easily with pulling the choke out, a slight twist of the throttle as you pull the choke to set the fast idle cam, then adjust the choke in to slow the idle speed to 2,500 and lower, depending on the temperature and could slowly take off the choke after a couple of minutes. They are cold blooded.
What is the condition of the carbs? Have the orings between the intake manifolds and the head been replaced yet? If not, you will have air leaking in which will effect the cold idle mixture and possibly after the motor warms up.
How many miles on the bike?
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Stu
Honda Parts manager in the mid 1970s Nashua Honda
My current rides
1975 K5 Planet Blue my summer ride, it was a friend's bike I worked with at the Honda shop in 76, lots of fun to be on it again
1976 K6 Anteres Red rebuilding project, was originally my brother's that I set up from the crate, it'll breath again soon!
Project 750s, 1 K2, 4 K6, 1 K8, 1 F1, 1 F3
2008 GL1800 my daily ride and cross country runner
Prior bikes....
1972 Suzuki GT380 I had charge of it for a year in 1973 while my friend was deployed and learned to love street riding....
New CB450 K7 after my friend returned...
New CB750 K5 Planet Blue, demise by ex cousin in law at 9,000 miles...
New CB750 K6 Anteres Red, to replace the totaled K5, I sold this K6 at 45k in 1983, I had heavily modified it, many great memories on it and have missed it greatly.....
1983 GL1100A, 1999 GL1500 SE, 1999 GL1500A
