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Author Topic: UNSOLVED MYSTERY: 1977 Honda cb750K  (Read 2876 times)

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Offline Don R

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Re: UNSOLVED MYSTERY: 1977 Honda cb750K
« Reply #50 on: January 11, 2023, 05:02:43 PM »
 My friend that builds race cars had a goal of making his chassis as stiff as possible. He did, but I think they learned the cars needed some flex to work their best. 
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Offline grcamna2

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Re: UNSOLVED MYSTERY: 1977 Honda cb750K
« Reply #51 on: January 11, 2023, 05:21:06 PM »
Quote from: Don R on January 11, 2023, 05:02:43 PM
My friend that builds race cars had a goal of making his chassis as stiff as possible. He did, but I think they learned the cars needed some flex to work their best.

For traction during stress ?
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Offline BenelliSEI

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Re: UNSOLVED MYSTERY: 1977 Honda cb750K
« Reply #52 on: January 11, 2023, 05:25:29 PM »
Quote from: jgger on January 11, 2023, 04:02:49 PM
You guys realize those are just cheap Chinese knock offs and they ain't worth anything. Send me picks of what you got and I might be able to come up with maybe $ 100.00! 🙈🙉🙊

If anyone needs this ‘77 cb750K engine mount bracket (the one that appears not where and no part number) I do have one..... no idea where it came from!
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Offline jlh3rd

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Re: UNSOLVED MYSTERY: 1977 Honda cb750K
« Reply #53 on: January 11, 2023, 05:50:23 PM »
neither does Honda🙄
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Offline Laids

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Re: UNSOLVED MYSTERY: 1977 Honda cb750K
« Reply #54 on: January 11, 2023, 05:56:16 PM »
Quote from: BenelliSEI on January 11, 2023, 05:25:29 PM
Quote from: jgger on January 11, 2023, 04:02:49 PM
You guys realize those are just cheap Chinese knock offs and they ain't worth anything. Send me picks of what you got and I might be able to come up with maybe $ 100.00! 🙈🙉🙊
[/quote
I sold the 77 basically in pieces, I told the buyer, don’t lose the mounts

If anyone needs this ‘77 cb750K engine mount bracket (the one that appears not where and no part number) I do have one..... no idea where it came from!
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Offline Tracksnblades1

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Re: UNSOLVED MYSTERY: 1977 Honda cb750K
« Reply #55 on: January 11, 2023, 05:57:15 PM »
Quote from: HondaMan on January 09, 2023, 08:11:05 PM
I bought a K7 from an estate (the widow) in Colorado Springs, circa 2007, and rebuilt it: the engine had been hit on the right side at the points cover by her husband's car in their garage, and sat for 20+ years after because it sheared off the spark advancer (basically it ruined the crankshaft) without damaging the engine cases. When I pulled that engine I took pictures of everything so I could document the "rebuild" to the guy who bought it later, but it did NOT have that fancy left lower bracket. It DID have a bent frame, so I had to strip the whole thing and then use hydraulics to straighten it ('twas a gamble, if it didn't work I was going to be out $500 for the bike), and the left-side frame was bent outward (toward the left) at that mount, about 3/4". That frame, though, was just like the '76F1 that I also had at the time, which also doesn't have that fancy thing! It was pretty simple to straighten, in the end, and worked out with wheels in align, and the works.

It had a Vetter, so I had a soft spot for it...
It had a build date of 10/76 on the steering head, making it a very early K7.

So, I don't have any clues about this, either!

So I’m guessing the 77/78k shared the same rake angle and longer swingarm with the 76F1…?
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Offline jpdevol

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Re: UNSOLVED MYSTERY: 1977 Honda cb750K
« Reply #56 on: January 11, 2023, 09:44:02 PM »
'76 750A fiche from CMSNL.COM
says p/n is 50351-393-000

...and also here: https://www.partssweden.se/honda-cb750a-750-hondamatic-1976-usa-cb750-four/frame

 :)
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Offline bryanj

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Re: UNSOLVED MYSTERY: 1977 Honda cb750K
« Reply #57 on: January 11, 2023, 11:03:49 PM »
Is it possible Honda used up excess 750A frames cos they didnt sell well
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Offline jlh3rd

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Re: UNSOLVED MYSTERY: 1977 Honda cb750K
« Reply #58 on: January 12, 2023, 04:56:04 AM »
Quote from: jpdevol on January 11, 2023, 09:44:02 PM
'76 750A fiche from CMSNL.COM
says p/n is 50351-393-000

...and also here: https://www.partssweden.se/honda-cb750a-750-hondamatic-1976-usa-cb750-four/frame

 :)
Quote from: jlh3rd on January 09, 2023, 04:29:39 PM
got it.....yep...to me, the fact it's not on the parts list is weird.....

the '76 750A is the closest I've seen...but still one sided...
that is not it...


already posted that. The 750A is one sided....the '77K is a two sided bracket....
« Last Edit: January 12, 2023, 05:00:27 AM by jlh3rd »
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Offline jlh3rd

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Re: UNSOLVED MYSTERY: 1977 Honda cb750K
« Reply #59 on: January 12, 2023, 04:57:16 AM »
'77K
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Offline jlh3rd

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Re: UNSOLVED MYSTERY: 1977 Honda cb750K
« Reply #60 on: January 12, 2023, 04:57:54 AM »
'76 750A
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Offline jlh3rd

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Re: UNSOLVED MYSTERY: 1977 Honda cb750K
« Reply #61 on: January 12, 2023, 05:13:21 AM »
Quote from: bryanj on January 11, 2023, 11:03:49 PM
Is it possible Honda used up excess 750A frames cos they didnt sell well

two different part #'s
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Offline BenelliSEI

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Re: UNSOLVED MYSTERY: 1977 Honda cb750K
« Reply #62 on: January 12, 2023, 11:27:13 AM »
Checked the frame plate on my K7 today (with the “no part number” bracket). March 1977 build date, cb750K-2725117.
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Offline CycleRanger

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Re: UNSOLVED MYSTERY: 1977 Honda cb750K
« Reply #63 on: January 12, 2023, 11:34:56 AM »
Quote from: jlh3rd on January 12, 2023, 04:57:54 AM
'76 750A

Hmm, now that's interesting.
I wonder if some of the 77K frames were made in the same factory as the A bikes.
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Offline BenelliSEI

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Re: UNSOLVED MYSTERY: 1977 Honda cb750K
« Reply #64 on: January 12, 2023, 03:57:03 PM »
Looks like some ‘77 frames have the lug too! Spotted this one today on FB and it clearly shows the “regular” mount.
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Offline jlh3rd

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Re: UNSOLVED MYSTERY: 1977 Honda cb750K
« Reply #65 on: January 12, 2023, 05:25:05 PM »
are the #'s correct for a '77 K ?.....wonder what the frame # actually is...

that's an "F" front fender....
« Last Edit: January 12, 2023, 05:31:50 PM by jlh3rd »
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Offline jpdevol

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Re: UNSOLVED MYSTERY: 1977 Honda cb750K
« Reply #66 on: January 12, 2023, 09:56:56 PM »
Quote from: jlh3rd on January 12, 2023, 04:57:54 AM
'76 750A

The part number you showed is 50356-393-010 for the Right Rear Engine hanger (item 8 from the fiche), the part number of the “BRKT C. FR ENG HGR” (item 7 on fiche) is 50351-393-000
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Offline newday777

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Re: UNSOLVED MYSTERY: 1977 Honda cb750K
« Reply #67 on: January 13, 2023, 12:59:27 AM »
Quote from: jlh3rd on January 12, 2023, 05:25:05 PM

that's an "F" front fender....

Based on what?
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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
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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 jlh3rd

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Re: UNSOLVED MYSTERY: 1977 Honda cb750K
« Reply #68 on: January 13, 2023, 04:28:11 AM »
no front stay....either that or its missing...
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Offline jlh3rd

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Re: UNSOLVED MYSTERY: 1977 Honda cb750K
« Reply #69 on: January 13, 2023, 04:35:17 AM »
Quote from: jpdevol on January 12, 2023, 09:56:56 PM
Quote from: jlh3rd on January 12, 2023, 04:57:54 AM
'76 750A

The part number you showed is 50356-393-010 for the Right Rear Engine hanger (item 8 from the fiche), the part number of the “BRKT C. FR ENG HGR” (item 7 on fiche) is 50351-393-000

clicked on wrong one...ok....but...

#7 is still not it.....it is ONE -SIDED.....can't you see that?
.....again...
« Last Edit: January 13, 2023, 05:02:19 AM by jlh3rd »
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Offline jlh3rd

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Re: UNSOLVED MYSTERY: 1977 Honda cb750K
« Reply #70 on: January 13, 2023, 04:44:47 AM »
Quote from: newday777 on January 13, 2023, 12:59:27 AM
Quote from: jlh3rd on January 12, 2023, 05:25:05 PM

that's an "F" front fender....

Based on what?

It didn't have the front stay....but, nevermind, starting in 1977 for the K's , they went to a single stay....
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Offline BenelliSEI

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Re: UNSOLVED MYSTERY: 1977 Honda cb750K
« Reply #71 on: January 13, 2023, 04:45:43 AM »
Quote from: jlh3rd on January 13, 2023, 04:28:11 AM
no front stay....either that or its missing...

Both the 1977 (right) and 1978 (left) cb750K fenders had the single stay (no front) fenders.
« Last Edit: January 13, 2023, 04:47:40 AM by BenelliSEI »
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Offline jlh3rd

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Re: UNSOLVED MYSTERY: 1977 Honda cb750K
« Reply #72 on: January 13, 2023, 04:49:38 AM »
yep...I corrected myself...of course,they started that in'77 for the  K's.....I should never assume.....
« Last Edit: January 13, 2023, 04:51:31 AM by jlh3rd »
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Offline beemerbum

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Re: UNSOLVED MYSTERY: 1977 Honda cb750K
« Reply #73 on: January 13, 2023, 08:11:11 AM »
For what its worth, my 1977 K7 750 has 9/76 build date. It has the "no number" engine mount
« Last Edit: January 13, 2023, 08:13:05 AM by beemerbum »
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Offline jlh3rd

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Re: UNSOLVED MYSTERY: 1977 Honda cb750K
« Reply #74 on: January 13, 2023, 08:43:57 AM »
10/76, 9/77, 12/77.......bung

8/76, 9/76, 3/77.....bracket.....
« Last Edit: January 17, 2023, 02:43:31 PM by jlh3rd »
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