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Author Topic: Help me identify this CB 750 model  (Read 1785 times)

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Offline Teddyhoeg1982

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Help me identify this CB 750 model
« on: November 16, 2021, 12:16:05 AM »
I paid almost nothing for this bike, but I can not determine if it is a K or F model.
It is registered first time in 1977, but many parts are replaced.
From what I can see, it may be a Harley 16" rear wheel, and front forks also look very wide with a custom triple tree. I can not say if the rear swing arm is original.

Bike has a clean title and papers, but for some reason the papers only say CB 750, not exact model. The serial no. is very hard to read on the frame, since it has a thick layer of paint, but from the papers it is stated as 27xxxxx.

Engine sounds fine and it runs, but with the pod airfilters, it does not pull perfectly. I think the original airbox would fix this and it seems it would run great.

























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Offline markmyodb

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Re: Help me identify this CB 750 model
« Reply #1 on: November 16, 2021, 01:12:15 AM »
From the fuel tank & forks I'd say a K7 or K8.
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CB550K1: 1975
CB750K6: 1976

Offline bryanj

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Re: Help me identify this CB 750 model
« Reply #2 on: November 16, 2021, 01:14:08 AM »
Whats the number on the engine and i will look in id book 4 you
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Offline Teddyhoeg1982

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Re: Help me identify this CB 750 model
« Reply #3 on: November 16, 2021, 01:36:37 AM »
Quote from: markmyodb on November 16, 2021, 01:12:15 AM
From the fuel tank & forks I'd say a K7 or K8.
Is the K7 fuel tank actually different from the F2? Is the K fuel tank wider?
In regards to the forks I did recognize that this seems K, but it could of course have been replaced together with the tank.
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Offline Teddyhoeg1982

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Re: Help me identify this CB 750 model
« Reply #4 on: November 16, 2021, 01:40:04 AM »
Quote from: bryanj on November 16, 2021, 01:14:08 AM
Whats the number on the engine and i will look in id book 4 you
Will check later today when I get home from work
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Offline markmyodb

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Re: Help me identify this CB 750 model
« Reply #5 on: November 16, 2021, 01:51:41 AM »
Quote from: Teddyhoeg1982 on November 16, 2021, 01:36:37 AM
Quote from: markmyodb on November 16, 2021, 01:12:15 AM
From the fuel tank & forks I'd say a K7 or K8.
Is the K7 fuel tank actually different from the F2? Is the K fuel tank wider?
In regards to the forks I did recognize that this seems K, but it could of course have been replaced together with the tank.

I think the forks were the same F & K in the late 1970's, but the K Tank was larger and rounder at rear. Similar gas cap. The K model also had that ridge just above the center line, the F did not...as I remember them.
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I tell my wife the motorcycles are an investment...

CB550K1: 1975
CB750K6: 1976

Offline dusterdude

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Re: Help me identify this CB 750 model
« Reply #6 on: November 16, 2021, 02:12:22 AM »
Drum brake tells me k

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Offline Teddyhoeg1982

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Re: Help me identify this CB 750 model
« Reply #7 on: November 16, 2021, 02:57:16 AM »
Quote from: dusterdude on November 16, 2021, 02:12:22 AM
Drum brake tells me k

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Are you referring to the frame or the wheel? Because I think the wheel is a 16" Harley wheel.
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Online newday777

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Re: Help me identify this CB 750 model
« Reply #8 on: November 16, 2021, 03:45:40 AM »
Quote from: Teddyhoeg1982 on November 16, 2021, 01:36:37 AM
Quote from: markmyodb on November 16, 2021, 01:12:15 AM
From the fuel tank & forks I'd say a K7 or K8.
Is the K7 fuel tank actually different from the F2? Is the K fuel tank wider?
In regards to the forks I did recognize that this seems K, but it could of course have been replaced together with the tank.

The F model tank is definitely different than the K model tank.
The 1977 F2 had rear disc brake and dual front disc brakes.
The K model in 1977 K7 had wire spoke wheels, rear drum brake and single front disc brake(yours has all of these). Yes someone has changed the triple trees to wider billet aluminum trees(might be harley trees???)
More than likely your bike is a modified K model.

As a reference for you
This first picture is a 1977 K model how it came stock.
The second picture is a 1977 F2 as it came stock.
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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 bustech51

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Re: Help me identify this CB 750 model
« Reply #9 on: November 16, 2021, 03:50:25 AM »
It was common in the 70's to use the Honda hub assembly and use a Harley rim with different slokes.  That would allow you to have a wider rear tire.   I have that assemly and tire in my shed.

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Offline bustech51

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Re: Help me identify this CB 750 model
« Reply #10 on: November 16, 2021, 03:55:35 AM »
Carbs look like they came off a mid 70's 750. Not a later '77 or '78 750.

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Offline Teddyhoeg1982

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Re: Help me identify this CB 750 model
« Reply #11 on: November 16, 2021, 04:04:19 AM »
Quote from: bustech51 on November 16, 2021, 03:50:25 AM
It was common in the 70's to use the Honda hub assembly and use a Harley rim with different slokes.  That would allow you to have a wider rear tire.   I have that assemly and tire in my shed.

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Do you think the rear hub on my picture looks like the original Honda K7?
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Offline bustech51

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Re: Help me identify this CB 750 model
« Reply #12 on: November 16, 2021, 04:16:31 AM »
Definitely a Honda hub /Harley rim assembly.  I can't say what year hub maybe someone else cam identify it.  On the left side of the steering head (opposite side of the tag) the serial number is stammped into the frame.  May take a bit of GENTLE file and sandpaper use to find it.  Are the fatory side cover tabs still there?

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Offline Teddyhoeg1982

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Re: Help me identify this CB 750 model
« Reply #13 on: November 16, 2021, 04:24:45 AM »
Quote from: bustech51 on November 16, 2021, 04:16:31 AM
Definitely a Honda hub /Harley rim assembly.  I can't say what year hub maybe someone else cam identify it.  On the left side of the steering head (opposite side of the tag) the serial number is stammped into the frame.  May take a bit of GENTLE file and sandpaper use to find it.  Are the fatory side cover tabs still there?

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Yes I will try to remove the paint layer from the serial no.
In regards to the side cover tabs, I will try to remove the current covers and provide a picture.
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Offline Jerry Rxman Griffin aka MuthaF'er

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Re: Help me identify this CB 750 model
« Reply #14 on: November 16, 2021, 05:09:09 AM »
What ever it is it has been highly modified. Engine number? 77/78 K rear swingarm. Pre 77 carbs.
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Offline BenelliSEI

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Re: Help me identify this CB 750 model
« Reply #15 on: November 16, 2021, 06:23:31 AM »
Check that front axle. With those wide trees, there is a huge gap between the fork leg and the speedo drive. That suggests the axle is barely clamped?
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Offline Teddyhoeg1982

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Re: Help me identify this CB 750 model
« Reply #16 on: November 16, 2021, 06:42:30 AM »
Quote from: BenelliSEI on November 16, 2021, 06:23:31 AM
Check that front axle. With those wide trees, there is a huge gap between the fork leg and the speedo drive. That suggests the axle is barely clamped?
Does indeed look questionable on the picture below - look like the wheel axle may be "hanging" within the homemade spacer.
Will take a look when I get back home today. I am anyway not driving the bike, since it was my plan to find out whether it was a K, and therefore worth putting some money in to making it more original.

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Offline Teddyhoeg1982

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Re: Help me identify this CB 750 model
« Reply #17 on: November 16, 2021, 08:36:11 AM »
Quote from: bryanj on November 16, 2021, 01:14:08 AM
Whats the number on the engine and i will look in id book 4 you
The engine no is CB750E-2738679
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Offline Teddyhoeg1982

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Re: Help me identify this CB 750 model
« Reply #18 on: November 16, 2021, 08:38:33 AM »
Quote from: newday777 on November 16, 2021, 03:45:40 AM
Quote from: Teddyhoeg1982 on November 16, 2021, 01:36:37 AM
Quote from: markmyodb on November 16, 2021, 01:12:15 AM
From the fuel tank & forks I'd say a K7 or K8.
Is the K7 fuel tank actually different from the F2? Is the K fuel tank wider?
In regards to the forks I did recognize that this seems K, but it could of course have been replaced together with the tank.

The F model tank is definitely different than the K model tank.
The 1977 F2 had rear disc brake and dual front disc brakes.
The K model in 1977 K7 had wire spoke wheels, rear drum brake and single front disc brake(yours has all of these). Yes someone has changed the triple trees to wider billet aluminum trees(might be harley trees???)
More than likely your bike is a modified K model.

As a reference for you
This first picture is a 1977 K model how it came stock.
The second picture is a 1977 F2 as it came stock.
I just managed to find the right angle of light and could see that the VIN is indeed a K frame. So that clears things up for me. Probably i will go at making this bike relatively original and drivable, i have front fork, gauges and other stuff from a K in inventory anyway.
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Online 69cb750

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Re: Help me identify this CB 750 model
« Reply #19 on: November 16, 2021, 08:55:25 AM »
Quote
The engine no is CB750E-2738679
CB750E-2738679 is a very late K7 engine, near last day.
Please report frame vin
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Offline Teddyhoeg1982

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Re: Help me identify this CB 750 model
« Reply #20 on: November 16, 2021, 09:04:58 AM »
Quote from: 69cb750 on November 16, 2021, 08:55:25 AM
Quote
The engine no is CB750E-2738679
CB750E-2738679 is a very late K7 engine, near last day.
Please report frame vin
Frame is 2720131
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Offline BenelliSEI

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Re: Help me identify this CB 750 model
« Reply #21 on: November 16, 2021, 09:33:34 AM »
A good friend and I have restored 3-4 K7/8 bikes (and scrapped a few). Let me know if you need any parts.
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Offline bustech51

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Re: Help me identify this CB 750 model
« Reply #22 on: November 16, 2021, 09:46:42 AM »
Hey 69cb750, do you keep track of VIN codes?

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Offline Stev-o

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Re: Help me identify this CB 750 model
« Reply #23 on: November 16, 2021, 10:31:12 AM »
Quote from: Teddyhoeg1982 on November 16, 2021, 09:04:58 AM
Quote from: 69cb750 on November 16, 2021, 08:55:25 AM
Quote
The engine no is CB750E-2738679
CB750E-2738679 is a very late K7 engine, near last day.
Please report frame vin
Frame is 2720131

Frame is also a K7 [1977].  Here is the model guide...

http://www.sohc4.com/cb750/cb750k/

That front end looks freakishly odd, do you plan to change it?


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Online 69cb750

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Re: Help me identify this CB 750 model
« Reply #24 on: November 16, 2021, 10:31:20 AM »
Quote
Hey 69cb750, do you keep track of VIN codes?
You have a question ?
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