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Author Topic: CB750K4 what did I get myself into?  (Read 16226 times)

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Offline BrockCB750

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Re: CB750K4 what did I get myself into?
« Reply #150 on: September 15, 2023, 10:57:44 AM »
I bought an allen head bit for my impact screwdriver and tried hammering that allen head screw out. Tons of heat and tons of hammer... I got nowhere. It was about time I got an air compressor. So I got one and an impact... they came right off. No issue at all. haha. Its REALLY nice when you have the right tool for the job.



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Offline PeWe

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Re: CB750K4 what did I get myself into?
« Reply #151 on: September 15, 2023, 12:29:20 PM »
You won the fight against the stubborn bolt! ;)

Compressor is a must have anyway
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CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline BrockCB750

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Re: CB750K4 what did I get myself into?
« Reply #152 on: September 16, 2023, 02:59:23 PM »
So I have the front wheel, disc, hub, etc. Pulled up the service manual to see how I take this thing apart and the page is missing from EVERY upload. I tried 3 different sources. All missing the page. Can anyone help me find page 132?

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Offline BrockCB750

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Re: CB750K4 what did I get myself into?
« Reply #153 on: September 16, 2023, 03:01:19 PM »
Well nevermind futher searching led me to this thread which had a pdf of that page:

http://forums.sohc4.net/index.php?topic=71220.0
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Offline BrockCB750

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Re: CB750K4 what did I get myself into?
« Reply #154 on: September 17, 2023, 01:21:18 PM »
Score another one for the impact. Saved me twice now. Look at how bad the corrosion is on this thread. Been slow going waiting for tools and whatnot. Getting very close to actually restoring some part of this motorcycle. haha



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Offline PeWe

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Re: CB750K4 what did I get myself into?
« Reply #155 on: September 18, 2023, 01:09:40 AM »
From my reprinted paper version I bought on eBay UK.
Living room version. It will never see dirty fingers. Same with Mark Paris book ;)

I think I have added a missing page before in a thread here.
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CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline BrockCB750

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Re: CB750K4 what did I get myself into?
« Reply #156 on: September 25, 2023, 04:42:04 PM »
So every single part of the bike is apart finally. Rear hub took a little time.

So I am not very smart on brakes, particularly drum brakes. The hub has an inner layer that the pads press into. What is the material and should I be careful about how I clean it up?



Also for fun, here is my current pile of stuff I need to haul to the dump:



Not everything there is going but most of it. Those wheels are a very sharp rolling tetanus risk.

Looking at this picture reminded me of another question. If the disc brake measures out okay, what are the chances that it can be resurfaced? Just now thinking about this so probably need to do some more searching around here. Its very old but relative to the rest of the bike can possibly be salvaged.

I am getting so very close to starting to restore the bike. Trying to decide if I want to paint the hubs or just clean them up and then I am going to lace the spokes and drop them off to get the tubes and tires put in.

Timing is perfect, sweated through the late summer getting this rust bucket apart and I can take my time during the winter to get this back together.
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Online newday777

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Re: CB750K4 what did I get myself into?
« Reply #157 on: September 25, 2023, 04:58:42 PM »
Yes you can get the rotor resurfaced. And drilled too if you want.

Godfrey's Garage does it(he's a member here)

And Truedisk does it too
https://truedisk.net/
« Last Edit: September 25, 2023, 05:05:29 PM 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, 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 BenelliSEI

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Re: CB750K4 what did I get myself into?
« Reply #158 on: September 25, 2023, 05:20:04 PM »
The inside of the drum is a cast iron liner. Don’t be afraid to tackle it with a good, course sand paper, then a finer one. That looks pretty greasy, get it really clean before sanding.
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Offline HondaMan

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Re: CB750K4 what did I get myself into?
« Reply #159 on: September 26, 2023, 04:41:25 PM »
The front disc is stainless steel (18-8, IIRC) so it should resurface with emery paper on a drill, or the like. They seldom warp: I have not (myself) ever seen a warped one. They are so thick they just never overheat. Later bikes have 1/2 as thick discs, and they do occasionally warp (Yamaha comes to mind).
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See SOHC4shop.com for info about the gadgets I make for these bikes.

The demons are repulsed when a man does good. Use that.
Blood is thicker than water, but motor oil is thicker yet...so, don't mess with my SOHC4, or I might have to hurt you.
Hondaman's creed: "Bikers are family. Treat them accordingly."

Link to Hondaman Ignition: http://forums.sohc4.net/index.php?topic=67543.0

Link to My CB750 Book: https://www.lulu.com/search?adult_audience_rating=00&page=1&pageSize=10&q=my+cb750+book
Link to My CB500/CB550 Book: https://www.lulu.com/search?sortBy=RELEVANCE&page=1&q=my+cb550+book&pageSize=10&adult_audience_rating=00
Link to website: https://sohc4shop.com/  (Note: no longer at www.SOHC4shop.com, moved off WWW. in 2024).

Offline BrockCB750

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Re: CB750K4 what did I get myself into?
« Reply #160 on: October 02, 2023, 03:43:51 PM »
Nice thanks for the advice on the rotor. I might take stab a cleaning it up myself or get it resurfaced if needed.

I am finally done with pretty much all the dirty jobs except the engine cleanup. But, I may pay someone to blast it for me. Spent a long time in the backyard with a bottle of simple green, the hose and a scrubber pad. Rear hub parts were coated in what I guess is brake dust and chain lube. A little time with the brass wire wheel, a little more scrubber pad and then some prep and I think I will be ready for some more paint.

The best news, the restoration has begun! Primered and applied a few coats of matte black enamel to the front hub. Waiting for it to cure and then finish up with enamel clear.





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Offline BrockCB750

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Re: CB750K4 what did I get myself into?
« Reply #161 on: October 03, 2023, 05:21:55 PM »
Front hub got new bearings:





Everything is flush in the hub. The collar has a very slight amount of movement after everything is back together. Scratched near the retaining ring trying to tighten it down but nobody will see that. Need to stake it down but wanted to post pictures just in case someone noticed I did something wrong haha.

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Offline BrockCB750

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Re: CB750K4 what did I get myself into?
« Reply #162 on: October 09, 2023, 11:37:51 AM »
One wheel done:

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Offline BenelliSEI

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Re: CB750K4 what did I get myself into?
« Reply #163 on: October 09, 2023, 02:24:44 PM »
Nice work. It will look great with a fresh disc and new tire!
« Last Edit: October 24, 2023, 04:49:29 PM by BenelliSEI »
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Online denward17

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Re: CB750K4 what did I get myself into?
« Reply #164 on: October 09, 2023, 02:35:00 PM »
I like it....Is the rim paint or powder coat?
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Offline Kaze

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Re: CB750K4 what did I get myself into?
« Reply #165 on: October 15, 2023, 10:19:27 AM »
Just saw the "before" pics. That looks exactly like a project I'd go for. You've really dug in deep. Must be having the time of your life! :)
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One man's rubbish is another man's project.

Offline BrockCB750

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Re: CB750K4 what did I get myself into?
« Reply #166 on: October 24, 2023, 04:40:19 PM »
Haha! Time of my life? Hmm... I wouldn't call it that. It was a massive relief getting the thing apart with only one broken off fastener. That was exciting.

Work has been a little crazy and some travel but I finally got around to painting the rear hub, new bearings and new rubber dampener things (can't remember what they are called at the moment).

I think its time to lace the spokes.

Paint is a little wet from wiping off some stuff on it. When I get the spokes laced on it I will take another picture of it all cleaned up.

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Offline SOHC4 Cafe Racer Fan

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Re: CB750K4 what did I get myself into?
« Reply #167 on: October 25, 2023, 06:07:58 PM »
Those cush drives look like NOS (not the easiest thing to come by).
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1975 CB550K1 "Blue" Stockish Restomod (http://forums.sohc4.net/index.php?topic=135005.0)
1975 CB550F1 frame/CB650 engine hybrid "The Hot Mess" (http://forums.sohc4.net/index.php/topic,150220.0.html)
2008 Triumph Thruxton (http://forums.sohc4.net/index.php/topic,190956.0.html)
2014 MV Agusta Brutale Dragster 800
2015 Yamaha FZ-09 (http://forums.sohc4.net/index.php/topic,186861.0.html)

"There are some things nobody needs in this world, and a bright-red, hunch-back, warp-speed 900cc cafe racer is one of them — but I want one anyway, and on some days I actually believe I need one.... Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles, Bubba." Hunter S. Thompson, Song of the Sausage Creature, Cycle World, March 1995.  (http://www.latexnet.org/~csmith/sausage.html and https://magazine.cycleworld.com/article/1995/3/1/song-of-the-sausage-creature)

Sold/Emeritus
1973 CB750K2 "Bionic Mongrel" (http://forums.sohc4.net/index.php?topic=132734.0) - Sold
1977 CB750K7 "Nine Lives" Restomod (http://forums.sohc4.net/index.php?topic=50490.0) - Sold
2005 RVT1000RR RC51-SP2 "El Diablo" - Sold
2016+ Triumph Thruxton 1200 R (http://forums.sohc4.net/index.php/topic,170198.0.html) - Sold

Offline BrockCB750

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Re: CB750K4 what did I get myself into?
« Reply #168 on: October 26, 2023, 06:49:09 AM »
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Offline MauiK3

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Re: CB750K4 what did I get myself into?
« Reply #169 on: October 26, 2023, 07:47:04 AM »
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1973 CB 750 K3
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Offline PeWe

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Re: CB750K4 what did I get myself into?
« Reply #170 on: October 26, 2023, 08:25:48 AM »
I thought the separate parts were the older.
Those that are connected with a tang the later.

I have a Honda labeled  plastic bag with the separate, small and big rubber parts.
Ordered from Germany some years ago.

They costed much more than the other I think is later.

Fitness very tight, I gave up pressing in the sprocket carrier despite lube, replaced with the other model.
My K6 need new since the rubber has cracked. I'll try my older set again at next wheel off.
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CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline BenelliSEI

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Re: CB750K4 what did I get myself into?
« Reply #171 on: October 26, 2023, 04:06:37 PM »
Quote from: BrockCB750 on October 26, 2023, 06:49:09 AM
They are not NOS I believe. "Rear Wheel Damper Rubber Set"
https://www.vintagecb750.com/products/3/suspension-wheel/132/rims-spokes-wheel-seals-tire-valve-stems

Brock…… I’m curious; how snug were these when you went to slide the drive side back in place?  Thanks, I need a set on my K4 and have never tried those. Fairly recent addition to their offerings.
« Last Edit: October 26, 2023, 04:12:34 PM by BenelliSEI »
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Offline BrockCB750

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Re: CB750K4 what did I get myself into?
« Reply #172 on: October 27, 2023, 09:35:20 AM »
Haven't gotten that far yet. Will report back when I do.
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Offline BenelliSEI

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Re: CB750K4 what did I get myself into?
« Reply #173 on: October 27, 2023, 04:59:38 PM »
Please do!
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Offline CycleRanger

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Re: CB750K4 what did I get myself into?
« Reply #174 on: October 29, 2023, 06:54:04 AM »
Quote from: BenelliSEI on October 26, 2023, 04:06:37 PM
Quote from: BrockCB750 on October 26, 2023, 06:49:09 AM
They are not NOS I believe. "Rear Wheel Damper Rubber Set"
https://www.vintagecb750.com/products/3/suspension-wheel/132/rims-spokes-wheel-seals-tire-valve-stems

Brock…… I’m curious; how snug were these when you went to slide the drive side back in place?  Thanks, I need a set on my K4 and have never tried those. Fairly recent addition to their offerings.

Good to see that they are repopping these now.
~12 years ago when I replaced the ones on my K5 all there were was Honda parts and they were getting scarce.
It did take a little effort to squeeze the drive side back in but it wasn't too bad. A bit of soapy water helps to facilitate things.
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https://www.honda4fun.com/materiale/documentazione-tecnica
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