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Author Topic: 1975 cb750 back to stock slowwwww build  (Read 2710 times)

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Offline TheArchitect

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1975 cb750 back to stock slowwwww build
« on: November 09, 2015, 04:58:12 PM »
Well, I have posted elsewhere in the site with questions regarding this project, and thank you all to have replied.
Figured I ought to start a thread so you can see what I am dealing with and how it turns out!

Bike:75' Planet Blue metallic that has some battle scars aesthetically, but all in all good shape from what I can tell.

The good: Tank, seat, side covers, all original and in great shape. Dropped the carb bowls and are very clean, the carbs in general are very clean. Engine feels good enough with out putting gas in it. Everything looks in order, that is not blatantly wrong. Miles 30,000.

The Bad: Hacked rear frame, front suspension swapped for 77' F set up, rear has some yoshimura branded shocks, full 77f wheelset and rear swing arm. Bottom of triple is from the F, the bars i think are from the f, the upper triple I cant tell. It has a kerker exhaust on it, headers are ok, muffler is wonky and the p/o put a yoshimura badge on it.... ??? And all the flashers are big and rectangular.

Looking to bring it back to stock. I like a good project, only 700 into it.











The cut off area


What needs to go back


weird...



The 77'F parts and yosh? shocks will be for sale at some point, looking to get a swing arm, spoked wheels and front end at first. Then approach the frame and all the fun things after. actually, get it running first, the carbs were off it when I bought it. It just looks to be very well taken care of, that to me is a good thing, at least until it got hacked. Just a little dusty now.



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1978 CB550
1975 CB750

Offline TheArchitect

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Re: 1975 cb750 back to stock slowwwww build
« Reply #1 on: November 09, 2015, 05:02:36 PM »
My only other project has been getting a 77' 550 back on the road. Sat in new england winters for two years....

Here are the carbs all cleaned etc. Keeping both going, the 550 just trying to ride that one for now...



what they were...


this was done using brass brushes on a dremel, and then polishing wheels on the dremel. in a dining room...
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1975 CB750

Offline SOHC4 Cafe Racer Fan

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Re: 1975 cb750 back to stock slowwwww build
« Reply #2 on: November 09, 2015, 05:14:30 PM »
There is some benefit to the modifications -- rear disc brake conversion and dual front disc brakes. 

Rather than welding replacement tube steel to replicate the stock brackets for the passenger pegs, why not simply buy an uncut K frame OR embrace the mods? 
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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)
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"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)

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Offline seanbarney41

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Re: 1975 cb750 back to stock slowwwww build
« Reply #3 on: November 09, 2015, 05:24:41 PM »
My best guess is that muffler is a Kerker with the Yoshimura tag screwed on.  I believe I have that same header but have never positively identified it, assumed it to be Kerker.  Also appears that someone added Yoshimura sickers to a set of EMGO shocks.  As far as the frame goes, I would guess someone needed a frame, possibly due to a crash, and ended up with a K frame, but parts from an F2/3.

     If you cannot find the passenger peg tubes, I have some.  They are from a frame that is too rusty to be repaired, so may not be useable.  I think they look ok on the outside.
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Offline seanbarney41

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Re: 1975 cb750 back to stock slowwwww build
« Reply #4 on: November 09, 2015, 05:30:37 PM »
Quote from: CB750 Cafe Racer Fan on November 09, 2015, 05:14:30 PM
There is some benefit to the modifications -- rear disc brake conversion and dual front disc brakes. 

Rather than welding replacement tube steel to replicate the stock brackets for the passenger pegs, why not simply buy an uncut K frame OR embrace the mods? 
+1, front brakes on that are wayyy better than any other stock sohc4.  Forks seem to have better dampening than older models and accept affordable bolt on brace from Tarrozi for much better handling.    Comstar wheels are very round and true and stay that way unless really beat upon
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Offline unamusedd

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Re: 1975 cb750 back to stock slowwwww build
« Reply #5 on: November 09, 2015, 08:16:54 PM »
I've been looking for that front end to swap into my 76 cb750. Maybe we can work something out. I'm also probably going to end up cutting those pieces you're missing from the rear. Not sure how different the 75 and 76 but shoot me a PM  :D.
« Last Edit: November 09, 2015, 08:19:38 PM by unamusedd »
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Offline edwardmorris

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Re: 1975 cb750 back to stock slowwwww build
« Reply #6 on: November 09, 2015, 09:44:28 PM »
Can't tell for sure, but here's a shot of a kerker exhaust, not the  best angle but to me your's looks different. OCICBW

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Offline seanbarney41

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Re: 1975 cb750 back to stock slowwwww build
« Reply #7 on: November 10, 2015, 03:12:14 AM »
yeah, those headers definately different in the collector area...where is that exhaust identification thread.
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Offline TheArchitect

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Re: 1975 cb750 back to stock slowwwww build
« Reply #8 on: November 10, 2015, 03:26:25 PM »
I knew I would hear it, those are good modifications to do, but if i keep em, that would mean i would need to get another cb750! I really want a stock one, and seeing how much work is put into them, i figure i have a good base and some parts to sell/trade to get it where i want it to be one day.

There is a rusty 75' frame ebay, that I have thought about, but looks pretty rusty, with out seeing it I worry about the internals etc. Maybe I will make a gamble on it.

This why I thought they could be kerker pipes, but maybe it is just a kerker muffler on who knows what headers....

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Offline edwardmorris

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Re: 1975 cb750 back to stock slowwwww build
« Reply #9 on: November 10, 2015, 03:56:05 PM »
Could just be a Kerker baffle....
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mikeb252

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Re: 1975 cb750 back to stock slowwwww build
« Reply #10 on: November 10, 2015, 08:25:57 PM »
I could use the comstar rear wheel only. 
Let me know if you would sell only that.
Thanks
Mike
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DH

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Re: 1975 cb750 back to stock slowwwww build
« Reply #11 on: November 11, 2015, 04:02:21 AM »
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Offline TheArchitect

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Re: 1975 cb750 back to stock slowwwww build
« Reply #12 on: November 11, 2015, 04:31:07 AM »
DH!

That is the frame I have been looking at... I could use a second opinion, there is quite a bit of surface rust, not being able to look at it in person is a gamble. It doesnt look awful, and I am thinking it would clean up well, but my experience with these frames is limited. Clearly it sat for a while, and some of the other 75' parts the seller has up there look pretty bad, assuming they come from the same bike....

Mikeb252,

A little to early to say yes or no, still figuring things out.

Thanks!
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Offline TheArchitect

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Re: 1975 cb750 back to stock slowwwww build
« Reply #13 on: November 11, 2015, 05:52:59 AM »
Scratch that. Bought the frame! Now I can ride the thing as is, and go for a solid restore on frame, build some wheels, and eventually swap the motor and everything else!

Those interested in the F parts, they will be for sale, still figuring out the path. If you are interested in all the F stuff, front end, rear end including wheels brakes shocks, that could make me get rid of it faster, but I am no hurry since I can ride it now, while prepping the rolling frame.

 8) 8) 8) 8)
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1975 CB750

DH

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Re: 1975 cb750 back to stock slowwwww build
« Reply #14 on: November 11, 2015, 05:55:26 PM »



.
Quote from: TheArchitect on November 11, 2015, 05:52:59 AM
Scratch that. Bought the frame! Now I can ride the thing as is, and go for a solid restore on frame, build some wheels, and eventually swap the motor and everything else!

Those interested in the F parts, they will be for sale, still figuring out the path. If you are interested in all the F stuff, front end, rear end including wheels brakes shocks, that could make me get rid of it faster, but I am no hurry since I can ride it now, while prepping the rolling frame.

 8) 8) 8) 8)



Hopefully the rust is all on the surface and will blast off. The places that are critical to check are the bottom tubes
in the foot peg areas and around the kick stand  and lower engine mounts. There should be drain holes in the lower tubes as well'. The seller has a good feedback rating on ebay, which is encouraging and implications are that his
description is accurate. The steering stop lug isn't broken or bent and the shock mounts look ok. Nothing else
 cut off, bent or broken?..
« Last Edit: November 11, 2015, 06:01:19 PM by DH »
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Offline TheArchitect

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Re: 1975 cb750 back to stock slowwwww build
« Reply #15 on: November 22, 2015, 04:08:03 PM »
Well, making progress by acquiring things as they come.

This is the replacement frame, pics are from the ebay post...

Surprisingly looks much better in person, all surface rust, nothing major at all, everything is there and is straight and solid. Time to start prepping it for paint or powder, we will see which route I go.

It is a 75 frame to replace the 75 frame that is cut. Nice to have the vin match the paint.





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Offline TheArchitect

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Re: 1975 cb750 back to stock slowwwww build
« Reply #16 on: November 22, 2015, 04:18:45 PM »
I also managed to get some other parts locally.

From the bike below. It was a burn out bike at a club somewhere in southern maine. The rear tire was just about burned all the way through. They then drained the oil out and ran it till it was toast. It must have caught on fire, some of the wires were all melted through.

It also has quite few stickers, one of which saying it climbed Mount washington in NH, and some other club stickers here in maine.

I like that I am giving the parts another life since this one had one heck of one.

And somehow, the master cylinder was not frozen at all, still clear fluid in the lines. I found that out after i cut them...should got the piston out when I had the chance :o! no bolts needed heat or cutting. Front caliper is super nice too, almost no paint chips and the original red dot is on there too. I was really surprised of the condition, looked so bad on craigslist.

I pulled the full triple tree, front forks, front brake set up w/ master, front wheel with rotor, rear wheel will all the chain tensioning bits, got a very nice deal on em.

Wheels I wanted just for the hubs, would like to lace my own, i have done it for bicycles in the past. Forks are also just for the lowers, tubes are rusty. All in all, this takes care of all the major parts other than rear suspension.

The frame I just got from a different bike came with the swing arm and swing arm bolt as well.













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Offline TheArchitect

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Re: 1975 cb750 back to stock slowwwww build
« Reply #17 on: November 29, 2015, 12:04:39 PM »
Well, started digging into the donor parts, hit the first snag with the rear hub.

First thing i noticed was on the sprocket side, the retaining ring with the pin spanner holes looks like someone wanted to make the round holes square. I am thinking they had the wrong tool and it didnt work out. Pulled the sprocket side off too look inside and got a face full of more brute force or wrong tool combo. The bearing retainer looks awful. I thought, well this will be tough, flipped it over an the facing of the brake side is all burred up and worn away in one location. The brake face plate is fine, but I am thinking this hub is close to useless, which is a bit of a bummer. Any one have any spares? This was off a 74, putting them on a 75 750.





This is the brake side



It seems like it isnt worth the time to try and take the mangled bits out since the hub itself is damaged.
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1978 CB550
1975 CB750

Offline Bill/BentON Racing

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Re: 1975 cb750 back to stock slowwwww build
« Reply #18 on: December 17, 2015, 07:35:57 AM »
Dat be butt ugly! I can help! ;D
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Offline TheArchitect

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Re: 1975 cb750 back to stock slowwwww build
« Reply #19 on: December 18, 2015, 05:42:54 AM »
Thank you Bill! It is so ugly it keeps me up at night, I can only image the the P/O furiously destroying this thing, so furious that he blew it up after.

Patience is a virtue.

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