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View Full Version : 1975 Honda CB400F Supersport


John V
04-08-2015, 07:58 AM
It's spring - who wants a nice motorcycle to tool around on?

10,000 RPM redline, 400cc, a Honda-slick 6-speed transmission, and less than 400lbs. Not a rocketship by any means, but it makes great noises and looks killer. This one has 10,000 miles on it, original paint and stickers and most importantly, the frame hasn't been cut to make it a cafe wannabe. :)

I picked up this one a couple of years ago, mostly because I always loved the way they looked and I wanted to have one in my garage. It was in fair condition at the time; the previous owner had put an aftermarket pipe on it and pod filters and it ran very badly. The carbs had been leaking for years as well as the petcock so the engine had varnish stains all over it. The cam chain tensioner had broken so the chain was making an awful racket and slapping against the internal engine case. The front brake didn't work (even worse than when it was new :lol:).

I'm asking $3,700 for it which I think is reasonable but I'll entertain offers. I have more than that into it, but isn't that how this kind of thing goes? :)

Here's what's been done:

Engine and exhaust
Painted the cases silver and replaced all the hardware with stainless allen cap-head fasteners
Pulled the oil pan and cleaned the pickup and the sludge from the bottom (it had sat for about 20 years before the PO bought it)
Replaced the timing chain tensioner and spring and readjusted per the Honda procedure
Adjusted the valves
Installed Dyna coils (originals had split open)
Installed a transistorized ignition system
Replaced the spark plugs and wires
Sourced and installed an original air box, breather assembly, new air filter and snorkel to return the bike to stock
Cleaned and rebuilt the carbs, including new jets. They're synchronized properly and work very well.
Sent the header, collector and muffler to Jet-Hot to get coated. The header was nice when I started but they're not known for lasting a long time in stock form
Replaced all the exhaust gaskets
Fuel tank was coated by previous owner. I replaced the petcock and didn't see any issues with the coating. It was a non-rusty tank to start with.

Frame, Suspension and Wheels
Prepped and painted frame and swingarm black, preserving the original Honda stickers
Restored the front forks inside and out - new seals, oil, dust caps, and added adjustable preload spring caps
Replaced the rear shocks with Progressive brand units (I have the originals - they're blown and rusty, but I have them)
Installed a tapered bearing kit for the steering head. Big improvement in stability of the front fork.
Wheels are aluminum stock-sized replacements that came with the bike, laced with stainless spokes
Tires are modern Avons, with new tubes and rim strips.
Front fender has been removed (but the fork brace remains). I have the front fender, but I liked the look with it deleted.
Centerstand has been removed. I have it.
Passenger foot pegs have been removed. I have them.

Electrics
Replaced the battery with a lightweight (2 pound) Lithium unit
Replaced the fuse box with one using standard automotive blade fuses
Replaced the turn signal relay
Installed a light from a CB750 (much larger than the CB400F light - I don't have the original, it didn't come with the bike)
The turn signals and taillight are smaller "cafe" style parts. They came with the bike, but I liked the look so they stayed. I have the originals.

Brakes
Installed a modern master cylinder with the right bore size
Replaced the (rotten) front brake line with a braided SS unit
Honed the brake caliper bore, replaced the seal and installed a new SS piston
Installed modern sintered brake pads so it actually stops. Previous owner had the disc drilled.

I think that's pretty much it. I'll grab some more pictures this weekend but I wanted to toss this out there to gain interest. These are hard to find in nice shape and this is a really nice example. I've put a few hundred miles on it and it runs flawlessly as you'd expect of an old Honda. All the electrics work and it has enough power to keep up with traffic so long as you stay off the freeways. It can do freeway speeds, but that sort of defeats the purpose of a machine like this. I had my fun and now it's time for someone else to enjoy it so I can move onto my next project. :)

http://i368.photobucket.com/albums/oo126/vitamvauser/Mobile%20Uploads/20141004_172434_zpsjplz4ncn.jpg (http://s368.photobucket.com/user/vitamvauser/media/Mobile%20Uploads/20141004_172434_zpsjplz4ncn.jpg.html)

http://i368.photobucket.com/albums/oo126/vitamvauser/Mobile%20Uploads/20150404_201706_zpsfuqu9uqm.jpg (http://s368.photobucket.com/user/vitamvauser/media/Mobile%20Uploads/20150404_201706_zpsfuqu9uqm.jpg.html)

bren
04-08-2015, 08:53 AM
I really need to get the c4 out of the garage. :/

clyde
04-08-2015, 10:48 PM
I really need to get the c4 out of the garage. :/

Push it if you need to. Put an outdoor cover on it. It will be fine,

John V
04-13-2015, 06:04 AM
Piczzzzz

http://i368.photobucket.com/albums/oo126/vitamvauser/Mobile%20Uploads/20150412_172507_zpsn4nczaiv.jpg (http://s368.photobucket.com/user/vitamvauser/media/Mobile%20Uploads/20150412_172507_zpsn4nczaiv.jpg.html)

http://i368.photobucket.com/albums/oo126/vitamvauser/Mobile%20Uploads/20150412_172654_zpsftnvfxvz.jpg (http://s368.photobucket.com/user/vitamvauser/media/Mobile%20Uploads/20150412_172654_zpsftnvfxvz.jpg.html)

http://i368.photobucket.com/albums/oo126/vitamvauser/Mobile%20Uploads/20150412_172740_zpsgfamfv4o.jpg (http://s368.photobucket.com/user/vitamvauser/media/Mobile%20Uploads/20150412_172740_zpsgfamfv4o.jpg.html)

http://i368.photobucket.com/albums/oo126/vitamvauser/Mobile%20Uploads/20150412_173037_zpsaj2xqidh.jpg (http://s368.photobucket.com/user/vitamvauser/media/Mobile%20Uploads/20150412_173037_zpsaj2xqidh.jpg.html)

http://i368.photobucket.com/albums/oo126/vitamvauser/Mobile%20Uploads/20150412_172730_zpssdp8xzn9.jpg (http://s368.photobucket.com/user/vitamvauser/media/Mobile%20Uploads/20150412_172730_zpssdp8xzn9.jpg.html)

http://i368.photobucket.com/albums/oo126/vitamvauser/Mobile%20Uploads/20150412_172714_zpsnjjkxxbu.jpg (http://s368.photobucket.com/user/vitamvauser/media/Mobile%20Uploads/20150412_172714_zpsnjjkxxbu.jpg.html)

http://i368.photobucket.com/albums/oo126/vitamvauser/Mobile%20Uploads/20150412_172703_zpsrxso69zk.jpg (http://s368.photobucket.com/user/vitamvauser/media/Mobile%20Uploads/20150412_172703_zpsrxso69zk.jpg.html)

http://i368.photobucket.com/albums/oo126/vitamvauser/Mobile%20Uploads/20150412_172642_zpssn3up9kc.jpg (http://s368.photobucket.com/user/vitamvauser/media/Mobile%20Uploads/20150412_172642_zpssn3up9kc.jpg.html)

http://i368.photobucket.com/albums/oo126/vitamvauser/Mobile%20Uploads/20150412_172630_zpscctuaa9e.jpg (http://s368.photobucket.com/user/vitamvauser/media/Mobile%20Uploads/20150412_172630_zpscctuaa9e.jpg.html)

http://i368.photobucket.com/albums/oo126/vitamvauser/Mobile%20Uploads/20150412_172616_zps763rplma.jpg (http://s368.photobucket.com/user/vitamvauser/media/Mobile%20Uploads/20150412_172616_zps763rplma.jpg.html)

http://i368.photobucket.com/albums/oo126/vitamvauser/Mobile%20Uploads/20150412_172609_zpsd1nuzhep.jpg (http://s368.photobucket.com/user/vitamvauser/media/Mobile%20Uploads/20150412_172609_zpsd1nuzhep.jpg.html)

http://i368.photobucket.com/albums/oo126/vitamvauser/Mobile%20Uploads/20150412_172554_zpsscwdmvor.jpg (http://s368.photobucket.com/user/vitamvauser/media/Mobile%20Uploads/20150412_172554_zpsscwdmvor.jpg.html)

John V
04-13-2015, 06:05 AM
moAr piczzz


http://i368.photobucket.com/albums/oo126/vitamvauser/Mobile%20Uploads/20150412_172541_zpstplwjaik.jpg (http://s368.photobucket.com/user/vitamvauser/media/Mobile%20Uploads/20150412_172541_zpstplwjaik.jpg.html)

http://i368.photobucket.com/albums/oo126/vitamvauser/Mobile%20Uploads/20150412_172532_zps30urtvta.jpg (http://s368.photobucket.com/user/vitamvauser/media/Mobile%20Uploads/20150412_172532_zps30urtvta.jpg.html)

http://i368.photobucket.com/albums/oo126/vitamvauser/Mobile%20Uploads/20150412_172515_zpsqr48tfsf.jpg (http://s368.photobucket.com/user/vitamvauser/media/Mobile%20Uploads/20150412_172515_zpsqr48tfsf.jpg.html)

equ
04-13-2015, 09:34 AM
The moment I've been waiting for.

My work blocks pics, I'm trying to get on the phone to see them. But yeah... How do we add another to our collection of 3? I need to buy a barn first. Also a few friends in the NYC area come to mind who might want a bike...

John V
04-13-2015, 02:36 PM
I'm working on the "buy a barn" thing myself.

John V
04-22-2015, 09:28 AM
Looks like this is sold, the guy is coming down today to pick it up.

BahnBaum
04-22-2015, 10:20 AM
:thumbup:

Alex

bren
04-22-2015, 10:47 AM
Good. That's a relief.

:)

equ
04-22-2015, 09:30 PM
I asked around to at least 3-4 people. No one has garage space in this damned NYC area.

zach
04-23-2015, 04:44 PM
I asked around to at least 3-4 people. No one has garage space in this damned NYC area.

It's impossible in Boston, too. I want to buy a warehouse, basically, and nobody wants to sell me one.

John V
04-27-2015, 02:23 PM
The guy had a fun introduction to CB400F charging systems on the way home. The generator doesn't produce enough power at idle to keep the motorcycle running. Honda was banking on having enough battery capacity to run the bike in traffic, I guess. Well, Baltimore beltway at 5PM, plus rain plus an aftermarket lithium battery... yeah. He killed it in traffic and it wouldn't start on the kickstarter.

Ironically, it probably would have worked fine if I hadn't replaced the points ignition with a transistorized unit. :lol:

Eventually got it where he needed to go, so all is well.

BahnBaum
04-27-2015, 02:46 PM
He killed it in traffic and it wouldn't start on the kickstarter.

This is how he responded when I first texted him to see what he thought of the bike. (Understand that I touted you when I sent him your way).

"So much for ur buddies engineering skills. I'm sitting on the fucking side of the fucking road with a fucking dead bike".

Anyway, he got it started, got it home and seems very happy.

Alex

blee
04-27-2015, 02:54 PM
Is this something where the generator could be upgraded to prevent situations like this from occurring in stop-and-go traffic? Seems like something that might have been addressed by the aftermarket by now. Not sure why I'm asking, because I don't have a 1975 CB400F Supersport.

bren
04-27-2015, 03:10 PM
This is how he responded...

:lol:

John V
04-27-2015, 03:37 PM
Ha! That's funny. I had actually trekked up to where he was stopped with another (higher capacity) battery but he was gone when I got there.

He was in such a rush to get on the road and "beat the rain" (it was already raining at my house before he left) that I didn't have time to explain to him all the nuances of old Hondas. :dunno:

Blair, when I got this bike I had dreams of running a MicroSquirt (mini EFI setup) on it, but discovered the generator was too weak to run the computer and there is no way to cram a better generator in the engine case so I dropped that idea.