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Author Topic: 1975 400/4 Clutch  (Read 385 times)

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Offline MDW

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1975 400/4 Clutch
« on: February 17, 2024, 10:47:53 AM »
I am inspecting the clutch on my 400/4. When I last rode it before starting restoration the clutch slipped, or appeared to. I checked the friction plates and they are all in spec. 2 of the clutch plates are out of spec from a flatness perspective. I went online to order new plates and saw in the diagram attached that there is something called a "set ring special" (number 22). Mine doesn't have this. Does anyone know what that part is and if it is a option or a requirement? I also don't seem to have the parts 17 and 18 (disc spring seat and clutch disc spring).
Thanks. 
« Last Edit: February 17, 2024, 10:59:52 AM by MDW »
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Offline newday777

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Re: 1975 400/4 Clutch
« Reply #1 on: February 17, 2024, 12:16:20 PM »
That sounds alot like the wrong oil was put in the motor. Car oils with friction modifiers cause the clutch to slip.
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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, 2 K4, 2 K6, 1 K8
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

Offline HondaMan

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Re: 1975 400/4 Clutch
« Reply #2 on: February 17, 2024, 06:59:37 PM »
If this isn't caused by Newday777's observation:

Parts 22, 11 and 4 in the diagram are parts for the spring pack that lightly seats all the plates to prevent them from sticking or 'chattering' when the oil is cold, too thin, or very old (as in, parked too long, so plates stuck together). They are part of the overall height of the clutch pack. If they are missing, they are hard to come by: you might then consider installing and extra steel plate in their place (or maybe 2 of them) or else an extra fiber plate and steel plate, to take up the space. Otherwise the clutch springs will not have enough force to close the clutch pack when the lever is released, and it will slip.
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Offline newday777

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Re: 1975 400/4 Clutch
« Reply #3 on: February 18, 2024, 03:11:24 AM »
Quote from: MDW on February 17, 2024, 10:47:53 AM
I am inspecting the clutch on my 400/4. When I last rode it before starting restoration the clutch slipped, or appeared to. I checked the friction plates and they are all in spec. 2 of the clutch plates are out of spec from a flatness perspective. I went online to order new plates and saw in the diagram attached that there is something called a "set ring special" (number 22). Mine doesn't have this. Does anyone know what that part is and if it is a option or a requirement? I also don't seem to have the parts 17 and 18 (disc spring seat and clutch disc spring).
Thanks.
What oil specifically was put in 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, 2 K4, 2 K6, 1 K8
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

Offline Kevin

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Re: 1975 400/4 Clutch
« Reply #4 on: February 18, 2024, 06:46:26 AM »
Your description of parts 17 and 18 don't match what is pictured.
I'm wondering if you have a clutch pack out of a CB350F. Take a look at the 350F parts manual (there is one on this forum) to see if that matches what you have.


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A couple of 400F's and a
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Offline bryanj

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Re: 1975 400/4 Clutch
« Reply #5 on: February 18, 2024, 07:06:44 AM »
17 and 18 are a washer and a nut, please check and specify what you meant
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