Author Topic: My 1975 CB400F restoration project  (Read 2293 times)

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Offline Ozzybud

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My 1975 CB400F restoration project
« on: January 14, 2024, 01:46:22 PM »
Hi all i am going to start this thread documenting my recently acquired CB400F Restoration project.
I picked up this bike a couple months ago locally in Seattle for a Very good price. It has just over 20K miles on the clock. It had lots of corrosion and wear that you would expect from a 49 year old bike.

I was able to ride it over the last couple months to make sure it runs good and does not smoke. great compression and pulls very strong. Didn't know it was a six speed until my second ride. also nothing sounds like these small SOHC 4's.

I have been collection new parts,pieces and fasteners  from EBAY, CMS.NL and  David Silver Spares. I love to restore back to Factory Original as possible

 here are a couple pics before and in progress
1976 Z50A YELLOW
1970 CT70 BLUE
1971 CT70H ORANGE
1972 CT70H GREEN
1973 CL200 BLUE
1973 CB350F RED
1975 CB360T RED
1975 CB400F BLUE
1975 CB550 ORANGE
1976 CB750F RED

Offline Ozzybud

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Re: My 1975 CB400F restoration project
« Reply #1 on: January 14, 2024, 01:50:48 PM »
This was My project last week. cleaning, restoring and re-facing the gauges.

I am going to work from front to rear.

Front Rim is next.
1976 Z50A YELLOW
1970 CT70 BLUE
1971 CT70H ORANGE
1972 CT70H GREEN
1973 CL200 BLUE
1973 CB350F RED
1975 CB360T RED
1975 CB400F BLUE
1975 CB550 ORANGE
1976 CB750F RED

Offline BenelliSEI

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Re: My 1975 CB400F restoration project
« Reply #2 on: January 14, 2024, 02:00:09 PM »
Those gauges look great! My wife rode a  1977 400F for years. We painted it to match our cb550K and cb750K. One of the best bikes Honda ever made! Nice project!

Offline Ozzybud

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Re: My 1975 CB400F restoration project
« Reply #3 on: January 14, 2024, 02:21:50 PM »
great looking set of bikes.

Wondering about the blinkers on these bikes?  did all US Models have the Larger 22mm blinkers? this had the small ones in the rear 14mm and large up front.

All the CB400F s i see overseas have the smaller ones?  i am having a hard time finding the correct stays for the rear.

I made these from Parts i had laying around. they are too short but will work for now.
1976 Z50A YELLOW
1970 CT70 BLUE
1971 CT70H ORANGE
1972 CT70H GREEN
1973 CL200 BLUE
1973 CB350F RED
1975 CB360T RED
1975 CB400F BLUE
1975 CB550 ORANGE
1976 CB750F RED

Offline Mark1976

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Re: My 1975 CB400F restoration project
« Reply #4 on: January 14, 2024, 02:22:56 PM »
   Congratulations, you've a great bike there. I think keeping it as stock as possible is a great choice. I own a '77 as well, though far from stock, I've had it going on for 35 yrs, it takes a licking and keeps on ticking. A great bike...
Start with the end in mind...

Offline Mark1976

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Re: My 1975 CB400F restoration project
« Reply #5 on: January 14, 2024, 02:29:01 PM »

Wondering about the blinkers on these bikes?  did all US Models have the Larger 22mm blinkers? this had the small ones in the rear 14mm and large up front.

All the CB400F s i see overseas have the smaller ones?  i am having a hard time finding the correct stays for the rear.

I made these from Parts i had laying around. they are too short but will work for now.

Mine have the larger front and rear...

« Last Edit: January 14, 2024, 02:30:40 PM by Mark1976 »
Start with the end in mind...

Offline BenelliSEI

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Re: My 1975 CB400F restoration project
« Reply #6 on: January 14, 2024, 02:38:52 PM »
The Hondas in Canada got the larger blinkers in  starting 1976. The rear stalks on my wife’s were equally short, I think someone had cut them shorter. I just left them.
« Last Edit: January 14, 2024, 02:40:52 PM by BenelliSEI »

Offline Ozzybud

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Re: My 1975 CB400F restoration project
« Reply #7 on: January 14, 2024, 08:15:09 PM »
I started in on the front rim restoration this weekend. I have a new DID rim and Spokes from CMS.

I always start with the the rubber still on and clean up the disk by spinning the tire and using 220 grit on a sanding block until all the black marks and glazing is removed. I hold the axle up with 2 boards bolted  to the bench sticking out about 18". I don't have a lathe to face them off so this is the next best method for me to make them look like new.

The Bearing were howling when i was cleaning up the Disk.  The Spanner nut has 2peen marks that need to be drilled out ever so slightly , after drilling out the peen marks, I then heated the hub up with a heat gun. Nut came out with ease and both bearings tapped out with ease. I ordered new bearings and a seal. they should be here by tomorrow.

I use aircraft stripper to remove all the factory clear coat from the hub. the pictures i posted are post clear removal only. I will sand with 400/800/1500 before polishing.

I will sand and polish the hub tomorrow after i install the bearings,i'm hoping with using heat they will drop right in.

I will then clear coat the  hub. i always use catalyzed automotive clear. just 1 coat so it will protect and not chip off.
« Last Edit: January 14, 2024, 08:35:54 PM by Ozzybud »
1976 Z50A YELLOW
1970 CT70 BLUE
1971 CT70H ORANGE
1972 CT70H GREEN
1973 CL200 BLUE
1973 CB350F RED
1975 CB360T RED
1975 CB400F BLUE
1975 CB550 ORANGE
1976 CB750F RED

Offline denward17

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Re: My 1975 CB400F restoration project
« Reply #8 on: January 14, 2024, 08:25:47 PM »
Nice looking project. 

What brand of aircraft stripper do you use?

Offline Ozzybud

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« Last Edit: January 14, 2024, 08:55:01 PM by Ozzybud »
1976 Z50A YELLOW
1970 CT70 BLUE
1971 CT70H ORANGE
1972 CT70H GREEN
1973 CL200 BLUE
1973 CB350F RED
1975 CB360T RED
1975 CB400F BLUE
1975 CB550 ORANGE
1976 CB750F RED

Offline newday777

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Re: My 1975 CB400F restoration project
« Reply #10 on: January 15, 2024, 01:53:55 AM »

Wondering about the blinkers on these bikes?  did all US Models have the Larger 22mm blinkers? this had the small ones in the rear 14mm and large up front.

All the CB400F s i see overseas have the smaller ones?  i am having a hard time finding the correct stays for the rear.

I made these from Parts i had laying around. they are too short but will work for now.

Yes the 400/Fours in the US all came from the factory, as well as all the big bikes from 1975 to 78 with the big turn signals.
Back in 76 when I was parts manager and I had to get my new K6 750, I replaced the big signals with the smaller ones, as I had the availability of parts......so I had to make it my own 😎

The 400fours are a great little package of a bike. I worked on a friend's 76 this fall replacing fork seals and a new chain. I took it for a good test ride to be sure it was safe to hand back over to him, actually his dad was riding it while he was recouping from a work injury as his lawyer advised to stay off the bike until they had the settlement..... so I exercised it for him...
I have another friend, the owner of Honda Restoration Parts, that bought two 76 400s with low miles, as part of a package deal of his shop/house from an retired racer of 400s. I'm doing a clean out of the tanks(light surface rust in them) to prepare for getting them running when he gets back in April so he can sell them and his collection as he is getting ready to retire and wants to downsize as he doesn't ride anymore and wants to sell the parts business and property. He'd make a package deal for the right buyer. He and his wife have had a great time buying and selling the parts over the years but it's time to let a younger person that wants to have an opportunity to get it.
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 Ozzybud

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Re: My 1975 CB400F restoration project
« Reply #11 on: January 15, 2024, 04:44:24 PM »
Nice collection Newday77
1976 Z50A YELLOW
1970 CT70 BLUE
1971 CT70H ORANGE
1972 CT70H GREEN
1973 CL200 BLUE
1973 CB350F RED
1975 CB360T RED
1975 CB400F BLUE
1975 CB550 ORANGE
1976 CB750F RED

Offline Ozzybud

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Re: My 1975 CB400F restoration project
« Reply #12 on: January 30, 2024, 05:16:15 PM »
A little update on my progress. I got the front wheel re-laced and trued. Detailing the parts and pieces as I go. Using as many new Honda Fasteners and Parts  as possible. Replaced the seals in the front forks and polished up. I have a really nice uncracked headlight bucket that i need to paint and then i will be complete with the front clip. I bought 2 NOS headlight rings for the CB360 a couple years ago. Nice to find out its the correct part for the CB400F as well.
1976 Z50A YELLOW
1970 CT70 BLUE
1971 CT70H ORANGE
1972 CT70H GREEN
1973 CL200 BLUE
1973 CB350F RED
1975 CB360T RED
1975 CB400F BLUE
1975 CB550 ORANGE
1976 CB750F RED

Offline denward17

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Re: My 1975 CB400F restoration project
« Reply #13 on: January 30, 2024, 06:54:39 PM »
Looking good Ozzybud!

Offline Ozzybud

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Re: My 1975 CB400F restoration project
« Reply #14 on: February 01, 2024, 02:05:09 PM »
Got some minor bodywork and a nice shiny base/clear coat on the procured headlight bucket today.
Also started in on re-rimming the rear wheel.
This is very satisfying work for me, just to be able to do it and go from rusty and corroded to like shiny new. It looks like the bearings had been replace recently so we are going to roll with the existing ones.
Learning new things in retirement makes it all worth it!
1976 Z50A YELLOW
1970 CT70 BLUE
1971 CT70H ORANGE
1972 CT70H GREEN
1973 CL200 BLUE
1973 CB350F RED
1975 CB360T RED
1975 CB400F BLUE
1975 CB550 ORANGE
1976 CB750F RED

Offline Galactica

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Re: My 1975 CB400F restoration project
« Reply #15 on: February 01, 2024, 03:05:49 PM »
Really nice bike.  A CB400F would be my next project should one fall into my lap.

Offline jakec

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Re: My 1975 CB400F restoration project
« Reply #16 on: February 01, 2024, 03:47:33 PM »
I have restored a 400 as well. What a slog. Never again. Lol.

I always wanted to rebuild my wheels with DID shouldered aluminum rims. I still may do it one day. Unless a set of alloy wheels shows up for a good deal.
1970 CB750 K0
1977 CB750 Chop
1997 XR650L

Offline Ozzybud

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Re: My 1975 CB400F restoration project
« Reply #17 on: February 05, 2024, 01:39:20 PM »
I got The top Bridge completed today and made sure all the electricals were back in working order.
I also Got the rear wheel re laced and trued. polished and clear coated the hub over the weekend.
1976 Z50A YELLOW
1970 CT70 BLUE
1971 CT70H ORANGE
1972 CT70H GREEN
1973 CL200 BLUE
1973 CB350F RED
1975 CB360T RED
1975 CB400F BLUE
1975 CB550 ORANGE
1976 CB750F RED

Offline denward17

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Re: My 1975 CB400F restoration project
« Reply #18 on: February 05, 2024, 02:18:56 PM »
^Dang that looks good!

Offline BenelliSEI

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Re: My 1975 CB400F restoration project
« Reply #19 on: February 05, 2024, 02:30:36 PM »
Really nice work! Well done.

Offline Mark1976

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Re: My 1975 CB400F restoration project
« Reply #20 on: February 05, 2024, 04:13:40 PM »
Looks like new...
Start with the end in mind...

Offline Stev-o

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Re: My 1975 CB400F restoration project
« Reply #21 on: February 06, 2024, 07:34:30 AM »
Nice project and excellent workmanship!
'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline Kelly E

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Re: My 1975 CB400F restoration project
« Reply #22 on: February 06, 2024, 03:29:52 PM »
Instead of fumigating ourselves we use brake fluid left over from bleeding to strip paint and clear coating. It works great, it's cheap and not super toxic.
Here's our 75' CB 400-4 we resurrected from a 30 year sleep. We finished up in early 2017. It's not a restoration it's a rider and always starts right up.  8)
Never Give Up - Never Surrender

The Rust Bros. Garage Collection
1974 Honda CB 550 K0                                            1971 MGB/GT
1975 Honda CB 400F Super Sport                          1972 MGB/GT
1977 Kawasaki KZ 1000 LTD                                   1985 GMC S15
1978 Kawasaki KL 250
1980 Suzuki GS 1100E
1982 Honda CB 900F Super Sport
1983 Honda CB 1100F
1984 Honda VF 700S Sabre
1984 Honda VF 1000F Interceptor
1990 Moto Guzzi 1000 Le Mans
1994 Kawasaki Concours ZG 1000A9
2005 Harley Davidson Fat Boy

Offline Ozzybud

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Re: My 1975 CB400F restoration project
« Reply #23 on: February 06, 2024, 04:51:35 PM »
Nice looking bike Kelly!
Thanks everybody for the encouragement. I am way to much of a perfectionist.Sometimes i go overboard. Realizing that nothing is perfect!!

I got the Clutch basket Kit installed today! happy to have that Rattle go away.It will be some weeks before i can test it out.
« Last Edit: February 06, 2024, 04:54:49 PM by Ozzybud »
1976 Z50A YELLOW
1970 CT70 BLUE
1971 CT70H ORANGE
1972 CT70H GREEN
1973 CL200 BLUE
1973 CB350F RED
1975 CB360T RED
1975 CB400F BLUE
1975 CB550 ORANGE
1976 CB750F RED

Offline newday777

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Re: My 1975 CB400F restoration project
« Reply #24 on: February 06, 2024, 05:12:57 PM »
Excellent idea for using the brake fluid for stripping the paint.
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