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Author Topic: CB750K Cylinder Head Intake Manifold  (Read 873 times)

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Offline Wizard

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CB750K Cylinder Head Intake Manifold
« on: January 27, 2023, 07:31:56 PM »
Hi just thought I would share sourcing CB750K screwed intake flange adapter manifold.
In short, I removed adapter from head and damaged it and wasn't able to reuse I have a machining background with a bit of time was able to make a new one so I am sharing some notes.
« Last Edit: February 21, 2023, 08:06:21 PM by Wizard »
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Offline newday777

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Re: CB750K 3
« Reply #1 on: January 27, 2023, 07:57:27 PM »
Welcome aboard the forum Wizard
You didn't see a part number for them because they came only with the head.
Did you take one out of the head?
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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 Wizard

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Re: CB750K 3
« Reply #2 on: January 27, 2023, 08:02:31 PM »
I removed one to get the correct rubber insulators as my bike has a K3 Motor with PD41 keihin carbs.
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Offline Wizard

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Re: CB750K 3
« Reply #3 on: January 27, 2023, 08:09:00 PM »
Thanks for clearing up part number look like I will have to make one thread dia 33.5 guessing.
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Offline CycleRanger

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Re: CB750K 3
« Reply #4 on: January 27, 2023, 08:42:24 PM »
Impressive that you got it out intact. More often than not they don't.
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Do you have a copy of the Honda Shop Manual or Parts List for your bike? Get one here:
https://www.honda4fun.com/materiale/documentazione-tecnica
CB750K5        '79 XL250s     CL350K3
CB750K3        '76 XS650      '76 CJ360T

Offline Wizard

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Re: CB750K 3
« Reply #5 on: January 27, 2023, 08:52:45 PM »
I used heat to remove came out ok thread is stripped on adapter but head looks ok photo attached was not mine just for reference.
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Offline newday777

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Re: CB750K 3
« Reply #6 on: January 28, 2023, 12:26:48 AM »
Quote from: Wizard on January 27, 2023, 08:02:31 PM
I removed one to get the correct rubber insulators as my bike has a K3 Motor with PD41 keihin carbs.
Hmmm. K3 didn't come with PD41 carbs.
Are you sure it is a K3?
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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: CB750K 3
« Reply #7 on: January 28, 2023, 05:32:39 AM »
Use the correct thread chaser file, repair that one, and put it bacK. Coat it in a good anti seize lubricant and work it in and out until it’s back where it belongs.
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Offline Wizard

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Re: CB750K 3
« Reply #8 on: January 28, 2023, 12:53:58 PM »
Thanks for advice will use a thread file and refit best advice to all only remove these if it's last call.
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