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Author Topic: 1975 CB 750 F0 Project  (Read 6073 times)

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Markcb750

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1975 CB 750 F0 Project
« on: November 24, 2009, 12:19:26 PM »
I acquired this for free.  Total lack of TLC. 

My first step is to block & tackle it off the back of my truck.

Second tear down.

Then one of three choices:

1. Part it out.

2. Restore it.

3. Cafe it.

I think #'s 2 or 3 depend on condition of motor...

No mater what it looks like several thousand $$
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Offline BeSeeingYou

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Re: 1975 CB 750 F0 Project
« Reply #1 on: December 08, 2009, 09:58:44 PM »
Just saw this one.  So how's it going, good, bad, ugly? ;D
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Offline bgfootball67

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Re: 1975 CB 750 F0 Project
« Reply #2 on: December 09, 2009, 03:43:35 AM »
At least the price was right.  Nice score.
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Ohio Cafe Racers website - http://www.ohiocaferacers.com

Markcb750

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Re: 1975 CB 750 F0 Project
« Reply #3 on: December 09, 2009, 11:42:45 AM »
Working on diagnosing the reason it is seized.  My spark plug wrench from my 76 toolkit will not remove #3 or # 1 plug, bought a new wrench on Monday.


The locking mechanism on my block and tackle makes the effort to raise more then I can comfortably do by myself so I am looking for some good cheap units.  Hell getting old.


The last pic is Son & Grandson.

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Offline BeSeeingYou

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Re: 1975 CB 750 F0 Project
« Reply #4 on: December 09, 2009, 06:09:50 PM »
An 18 mm plug socket from Sears (Craftsman) will fit and give you the leverage you need.  The tool kit wrench doesn't give the leverage to get the really stuck ones out.  I had to put a two foot breaker bar on my ratchet to get the #3 out from my 76 that had been stored for 25 years.
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Offline Shenanigans

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Re: 1975 CB 750 F0 Project
« Reply #5 on: December 09, 2009, 06:29:23 PM »
If you do part it out, Dibs on the swingarm and rear caliper! ;D



Just sayin'
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   This pretty much sums it up.   76' CB592 cafe. 69 750 project, 03 CBR954, 75 750 super sport.

Markcb750

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Re: 1975 CB 750 F0 Project
« Reply #6 on: December 09, 2009, 06:29:50 PM »
I Bought a 18mm deep socket & a 18mm spark plug socket, one will work. I think...


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Offline BeSeeingYou

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Re: 1975 CB 750 F0 Project
« Reply #7 on: December 09, 2009, 08:09:26 PM »
Quote from: Shenanigans on December 09, 2009, 06:29:23 PM
If you do part it out, Dibs on the swingarm and rear caliper! ;D



Just sayin'

And the vultures begin to circle.... ;D 

I would be interested in the in the rear grab rail if......just sayin'... ;D
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Markcb750

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Re: 1975 CB 750 F0 Project
« Reply #8 on: December 10, 2009, 05:03:25 AM »
Don't rush me, I'm old...


Would hate to have y'all making the decision to donate my organs.
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Offline sangyo soichiro

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Re: 1975 CB 750 F0 Project
« Reply #9 on: December 10, 2009, 09:18:48 AM »
Quote from: Markcb750 on November 24, 2009, 12:19:26 PM
I acquired this for free.  Total lack of TLC. 

My first step is to block & tackle it off the back of my truck.

Second tear down.

Then one of three choices:

1. Part it out.

2. Restore it.

3. Cafe it.

I think #'s 2 or 3 depend on condition of motor...

No mater what it looks like several thousand $$


I vote for #3.  I'm curious on what the finished product would look like, whereas, I know what it would look like if you went the #2 route.
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1974 CB 750
1972 CB 750 http://forums.sohc4.net/index.php/topic,57974.0.html
1971 CL 350 Scrambler
1966 Black Bomber
Too many others to name…
My cross country trip: http://forums.sohc4.net/index.php/topic,138625.0.html

Offline Shenanigans

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Re: 1975 CB 750 F0 Project
« Reply #10 on: December 10, 2009, 10:19:55 AM »
Quote from: Markcb750 on December 10, 2009, 05:03:25 AM
Don't rush me, I'm old...


Would hate to have y'all making the decision to donate my organs.

Yeah, but we NEED organs  ;D

Restore it, cafes are a dime a dozen.
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   This pretty much sums it up.   76' CB592 cafe. 69 750 project, 03 CBR954, 75 750 super sport.

Markcb750

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Re: 1975 CB 750 F0 Project
« Reply #11 on: December 13, 2009, 05:16:50 PM »
The Crankshaft spins smoothly!
Clutch seams to function.
Transmission shifts.


Rear brake is frozen solid.


Now to remove the exhaust & carbs!



Interesting shocks, does anyone know if they are rebuildable?


The grab bar is pretty bent, I think it can be repaired with some heat, polishing and chroming.

Time and money... time & money.

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Offline Head

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Re: 1975 CB 750 F0 Project
« Reply #12 on: December 13, 2009, 05:47:34 PM »
If the shock absorbers them selves are Koni's, yes they are rebuildable. http://www.ikonsuspension.com/content/application_lists/fork_springs/honda_fork_application.shtml. They are about the best. Being using them for about 38 years.   Head
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1970x2,71,72,74,75K's,75F-FO-750ss, 2 x 75 GL1000, 77 GL1000,  3x 1981 CB900F, 74 550,  1966 CL77 305, 1967 CL77 305, 1974 MX360 Yamerhamer, 1983 CB1100F RED
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Markcb750

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Re: 1975 CB 750 F0 Project
« Reply #13 on: December 13, 2009, 06:21:58 PM »
Thanks for the info Head
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Offline Head

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Re: 1975 CB 750 F0 Project
« Reply #14 on: December 13, 2009, 06:34:56 PM »
Your welcome. I need some sort of lifting capabilities in my garage! I just picked up a 75F about 3 weeks ago. It's a work in progress.     Head
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1970x2,71,72,74,75K's,75F-FO-750ss, 2 x 75 GL1000, 77 GL1000,  3x 1981 CB900F, 74 550,  1966 CL77 305, 1967 CL77 305, 1974 MX360 Yamerhamer, 1983 CB1100F RED
NOTICE Due to current financial restraints the
Light at the end of the tunnel will be turned off until further notice!! sohc member#1522

Offline BeSeeingYou

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Re: 1975 CB 750 F0 Project
« Reply #15 on: December 13, 2009, 09:33:58 PM »
Do what you can to salvage the rear caliper and master cylinder as they are hard to find and specific to the 75/6 F. 
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Offline sangyo soichiro

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Re: 1975 CB 750 F0 Project
« Reply #16 on: December 15, 2009, 10:28:23 AM »
Mark, if you're still unsure whether you're going to restore it or turn it into a cafe racer, how about a compromise?



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1974 CB 750
1972 CB 750 http://forums.sohc4.net/index.php/topic,57974.0.html
1971 CL 350 Scrambler
1966 Black Bomber
Too many others to name…
My cross country trip: http://forums.sohc4.net/index.php/topic,138625.0.html

Markcb750

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Re: 1975 CB 750 F0 Project
« Reply #17 on: December 15, 2009, 11:26:31 AM »
soichiro

That would be great, sure would put the old design & engineering skills to work.


Time & Money are weighing me down.

Looks like I will need a new head & cylinders anyway, as the fins on the LH side have areas where they where damaged when the bike fell over, from the blacktop material embedded, I would guess the damage in the PO's driveway.  Looks like this was the last straw before he gave up.

I might try getting a gas kit for my little welder and see if I can gob on some aluminum and file off to an acceptable appearence, anyone tried this on this cast aluminum, or know what grade aluminum Honda Used so I could attempt to buy the right wire?

mark



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Offline sangyo soichiro

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Re: 1975 CB 750 F0 Project
« Reply #18 on: December 15, 2009, 11:34:34 AM »
Is it possible to weld cast aluminum?  I always thought cast metals were too porous.   ???

I'd be interested in learning how to weld such things.
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1974 CB 750
1972 CB 750 http://forums.sohc4.net/index.php/topic,57974.0.html
1971 CL 350 Scrambler
1966 Black Bomber
Too many others to name…
My cross country trip: http://forums.sohc4.net/index.php/topic,138625.0.html

Markcb750

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Re: 1975 CB 750 F0 Project
« Reply #19 on: December 15, 2009, 11:46:46 AM »
It can be done, the casting has metal responds to weld of heating different then cold rolled stock.  Something to do with the alloying elements and trapped gases if memory serves me right.

I think if the grade is known, a wire with better blending can be selected. Also it helps to preheat the weld area so that the weld and parent material have a little more time to mix in the transition zone, and the stresses created in the process are given time to "relax".


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Offline Don R

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Re: 1975 CB 750 F0 Project
« Reply #20 on: December 15, 2009, 11:27:15 PM »
How about the alloy they sell at the swap meets? If it goes on like the demonstration guy shows you could build it back up with that and a propane torch. There was a discussion about it here a while back, some had good luck with it.
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Markcb750

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Re: 1975 CB 750 F0 Project
« Reply #21 on: December 16, 2009, 03:45:58 AM »
Don R:

I have not seen this demonstration, do you remember a trade name for the product's trade name?

Mark
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Offline Retro Rocket

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Re: 1975 CB 750 F0 Project
« Reply #22 on: December 16, 2009, 04:48:20 AM »
This is what he is referring to...

Mick
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Markcb750

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Re: 1975 CB 750 F0 Project
« Reply #23 on: December 16, 2009, 05:32:06 AM »
Interesting, Thanks!
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coheed

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Re: 1975 CB 750 F0 Project
« Reply #24 on: December 16, 2009, 11:30:18 AM »
When the player pops up the related videos you should watch the third one from the left. That may be an indication of how well it works.
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