« Reply #2 on: October 04, 2025, 02:55:38 AM »
Hi Guys, I have a 400-4 and there are two connections in the middle of the carbs. Can you please tell me what hey are and whre they connect to. Thank you.
Welcome aboard the forum Stumcf
Are you asking about the circled upward pointing, brass color 3.5mm barbed joints, one on each of #2 & #3 carbs?
Those are the atmosphere vent joints that #329 vent pipes, 3.5mm hose, attach to and generally they go up over the stock airbox to the stillest calm air available between the side covers, out of the way of water intrusion. I don't have a 400F to show where they go.
Fuel lines are bigger, 5.5mm.
« Last Edit: October 04, 2025, 03:17:59 AM by newday777 »
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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
