Author Topic: Potential 1970 CB750 K0/K1 Hybrid  (Read 8934 times)

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Offline newday777

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Re: 1971 CB750 K0/K1 Hybrid
« Reply #25 on: June 22, 2023, 04:59:36 AM »
Red foam is back in stock now on Yamiya. It is $350 now plus $200 shipping to the US.

There are no other sources out there as far as I know.

Just dye the white foam red???

Can’t be too difficult.

It’s been on my list of things to figure out over the next few months.
The foam may start to break down from getting wet.
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: 1971 CB750 K0/K1 Hybrid
« Reply #26 on: June 22, 2023, 11:34:02 AM »
Red foam is back in stock now on Yamiya. It is $350 now plus $200 shipping to the US.

There are no other sources out there as far as I know.

Just dye the white foam red???

Can’t be too difficult.

It’s been on my list of things to figure out over the next few months.

Let me know how that goes…… I tried a few and failed miserably.

Offline jakec

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Re: 1971 CB750 K0/K1 Hybrid
« Reply #27 on: June 23, 2023, 06:41:10 PM »
Red foam is back in stock now on Yamiya. It is $350 now plus $200 shipping to the US.

There are no other sources out there as far as I know.

Just dye the white foam red???

Can’t be too difficult.

It’s been on my list of things to figure out over the next few months.

I’d be fine with white foam in the correct shape but no one makes that either.
1970 CB750 K0
1977 CB750 Chop
1997 XR650L

Offline grcamna2

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Re: 1971 CB750 K0/K1 Hybrid
« Reply #28 on: June 23, 2023, 07:35:25 PM »
Red foam is back in stock now on Yamiya. It is $350 now plus $200 shipping to the US.

There are no other sources out there as far as I know.

Just dye the white foam red???

Can’t be too difficult.

It’s been on my list of things to figure out over the next few months.

I’d be fine with white foam in the correct shape but no one makes that either.

4into1 carry it?
75' CB400F/'bunch o' parts' & 81' CB125S modded to a 'CB200S'
  I love the small ones too !
Do your BEST...nobody can take that away from you.

Offline jakec

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Re: 1971 CB750 K0/K1 Hybrid
« Reply #29 on: June 24, 2023, 10:19:14 AM »
I only see later style 1972-76
1970 CB750 K0
1977 CB750 Chop
1997 XR650L

Offline MauiK3

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Re: 1971 CB750 K0/K1 Hybrid
« Reply #30 on: June 25, 2023, 08:09:08 AM »
Waiting to hear what you find inside.
1973 CB 750 K3
10/72 build Z1 Kawasaki

Offline Lucien Harpress

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Re: 1971 CB750 K0/K1 Hybrid
« Reply #31 on: June 26, 2023, 07:22:32 AM »
The goal is to get the engine out this week.  I've pulled most, if not all of the stuff in the way (air box, carbs, oil tank).  I think today I'm going to get the frame wrapped to protect the paint.  I'm not looking forward to pulling it out sideways, but it is what it is.

I attempted to strain my used oil through a coffee filter- a good idea that didn't work.  Still, the bottom of the catch pan looked like  :)metallic paint, so I've got a couple good ideas of what I'm going to find.
-1970 CB750 K0
-1980 KZ1300
-1976 Yellow GL1000
-1965 CA77 "Dream"
-1997 Valkyrie
-1975 Velosolex

Offline Kevin D

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Re: 1971 CB750 K0/K1 Hybrid
« Reply #32 on: June 26, 2023, 07:56:48 AM »
I have used a paint filter and it works fairly well.
71 CB750 K1
104,000 miles
Original Owner
———past———
70 SL100/125/150
70 Candy BlueGreen CB 750 K0
————————————————-
Former Honda parts kid/counter kid/do all
—————————————————————-
Whether you think you can or think you can’t, you’re right
Genius is 99% perspiration, 1% inspiration

Offline Lucien Harpress

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Re: 1971 CB750 K0/K1 Hybrid
« Reply #33 on: June 28, 2023, 04:27:25 PM »
I would love to say this gets easier.  That would be a lie, though.





Thankfully, I didn't scuff up the frame or engine too bad getting it out.  The bad news?  I've added to my list of things I need replaced unrelated to the engine.  My "stripped rear shock mount" was joined by "new coil" because I may have forgotten one plug wire still in the plug well of the engine when I pulled it.  The wire came with it, the coil stayed.

In any case, since I'm going back into this engine I'm thinking of doing a couple other things beyond correct crank bearings.  I'm VERY strongly considering getting my crank balanced.  The bike has always been on the buzzy side, to the point my hands got tingly on longer rides and my mirrors were mostly useless.  I was hoping a rebuild would help things, but my 15 minute post-rebuild ride showed that not to be the case.

Cycle-X keeps coming up as the place to go for this, and the rates seem quite reasonable.  The plan is to get the engine tore apart again, take a look at the actual damage and (depending on what that looks like) then shoot out some exploratory e-mails. 
-1970 CB750 K0
-1980 KZ1300
-1976 Yellow GL1000
-1965 CA77 "Dream"
-1997 Valkyrie
-1975 Velosolex

Offline BenelliSEI

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Re: 1971 CB750 K0/K1 Hybrid
« Reply #34 on: June 28, 2023, 04:42:34 PM »
…… Nice work. I feel your pain.

Offline denward17

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Re: 1971 CB750 K0/K1 Hybrid
« Reply #35 on: June 28, 2023, 05:32:45 PM »
Good Luck Lucien...

Offline Don R

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Re: 1971 CB750 K0/K1 Hybrid
« Reply #36 on: June 28, 2023, 06:24:48 PM »
 My "tight spot" engine turned out to be a scuffed cylinder it was scuffed low where I couldn't see it with the head off. The piston had a matching bad spot. Good luck with yours. I've used a shop vac with a piece of tubing and brake clean to clean the oil tank.
  Mythbusters proved that sucking up fumes and gas doesn't always turn a shop vac into a jet engine.
No matter how many times you paint over a shadow, it's still there.
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 You don't need a weatherman to know which way the wind blows.

Offline Don R

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Re: 1971 CB750 K0/K1 Hybrid
« Reply #37 on: June 28, 2023, 06:35:11 PM »
Red foam has been out of stock for more than a few months, I missed (cheaped) out on getting one before JT Marks passed away, Now I wish I had gotten two.

Don: have you tried contacting his newer JTMarks77 seller? I think it is his daughter (wife?), as I got a girl's name with thanks on my last order from there.

 I sent an email to JT's old address, I'll see if she replies or is still ordering from yamiya.
No matter how many times you paint over a shadow, it's still there.
 CEO at the no kill motorcycle shop.
 You don't need a weatherman to know which way the wind blows.

Offline grcamna2

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Re: 1971 CB750 K0/K1 Hybrid
« Reply #38 on: June 28, 2023, 06:57:21 PM »
I would love to say this gets easier.  That would be a lie, though.





Thankfully, I didn't scuff up the frame or engine too bad getting it out.  The bad news?  I've added to my list of things I need replaced unrelated to the engine.  My "stripped rear shock mount" was joined by "new coil" because I may have forgotten one plug wire still in the plug well of the engine when I pulled it.  The wire came with it, the coil stayed.

In any case, since I'm going back into this engine I'm thinking of doing a couple other things beyond correct crank bearings.  I'm VERY strongly considering getting my crank balanced.  The bike has always been on the buzzy side, to the point my hands got tingly on longer rides and my mirrors were mostly useless.  I was hoping a rebuild would help things, but my 15 minute post-rebuild ride showed that not to be the case.

Cycle-X keeps coming up as the place to go for this, and the rates seem quite reasonable.  The plan is to get the engine tore apart again, take a look at the actual damage and (depending on what that looks like) then shoot out some exploratory e-mails.

Lucien,is that a KZ1300 in the foreground ?
75' CB400F/'bunch o' parts' & 81' CB125S modded to a 'CB200S'
  I love the small ones too !
Do your BEST...nobody can take that away from you.

Offline RAFster122s

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Re: 1971 CB750 K0/K1 Hybrid
« Reply #39 on: June 28, 2023, 09:25:19 PM »
I would love to say this gets easier.  That would be a lie, though.





Thankfully, I didn't scuff up the frame or engine too bad getting it out.  The bad news?  I've added to my list of things I need replaced unrelated to the engine.  My "stripped rear shock mount" was joined by "new coil" because I may have forgotten one plug wire still in the plug well of the engine when I pulled it.  The wire came with it, the coil stayed.

In any case, since I'm going back into this engine I'm thinking of doing a couple other things beyond correct crank bearings.  I'm VERY strongly considering getting my crank balanced.  The bike has always been on the buzzy side, to the point my hands got tingly on longer rides and my mirrors were mostly useless.  I was hoping a rebuild would help things, but my 15 minute post-rebuild ride showed that not to be the case.

Cycle-X keeps coming up as the place to go for this, and the rates seem quite reasonable.  The plan is to get the engine tore apart again, take a look at the actual damage and (depending on what that looks like) then shoot out some exploratory e-mails. 
What about APE in California, they do crank work...
David- back in the desert SW!

Offline Lucien Harpress

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Re: 1971 CB750 K0/K1 Hybrid
« Reply #40 on: June 29, 2023, 03:42:01 AM »

Lucien,is that a KZ1300 in the foreground ?

Sure is!  Picked that up a couple of years ago, and let me tell you, it's been a journey ever since.  It started with a bent rod, and while I've got it running and down the road, it's never been consistent.  The plan was to knuckle down and finally iron it out this summer once my 750 was done, but then this engine fun started, so looks like it's getting pushed back.

Still, when it IS working it's an absolute hoot.
-1970 CB750 K0
-1980 KZ1300
-1976 Yellow GL1000
-1965 CA77 "Dream"
-1997 Valkyrie
-1975 Velosolex

Offline Gamma

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Re: 1971 CB750 K0/K1 Hybrid
« Reply #41 on: June 29, 2023, 01:43:35 PM »
I feel for you Lucien, following with interest👍

Offline Kevin D

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Re: 1971 CB750 K0/K1 Hybrid
« Reply #42 on: July 01, 2023, 07:11:44 AM »
LH, it will be easier to reinstall your engine if you grind the top lips of the circled frame boss smooth with the barrel. Sorry, I used to have a photo of my own smoothed motor mount, but I’ll be darned if I can find it. It’s posted here somewhere in the dusty pages of SOHC4.
I’m pretty sure this is a Hondaman tip.
« Last Edit: July 04, 2023, 08:30:47 PM by Kevin D »
71 CB750 K1
104,000 miles
Original Owner
———past———
70 SL100/125/150
70 Candy BlueGreen CB 750 K0
————————————————-
Former Honda parts kid/counter kid/do all
—————————————————————-
Whether you think you can or think you can’t, you’re right
Genius is 99% perspiration, 1% inspiration

Offline denward17

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Re: 1971 CB750 K0/K1 Hybrid
« Reply #43 on: July 01, 2023, 08:20:32 AM »
Here's a pic of that mod....


Offline grcamna2

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Re: 1971 CB750 K0/K1 Hybrid
« Reply #44 on: July 01, 2023, 08:59:32 AM »
I can see that sharp edges make it tough to install the engine.
75' CB400F/'bunch o' parts' & 81' CB125S modded to a 'CB200S'
  I love the small ones too !
Do your BEST...nobody can take that away from you.

Offline Lucien Harpress

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Re: 1971 CB750 K0/K1 Hybrid
« Reply #45 on: July 04, 2023, 04:30:27 PM »
Whelp, teardown has begun, and even though I just have the head off, I've got a feeling deeper in is not going to be good.



(THAT definitely wasn't there before...)



(Now this bit of schmutz MIGHT be remains of the old head gasket, but on the other hand it is on one of the oil feed studs, and the others look pretty clean)

I stopped at the bores, because they seem pretty stuck on the block, and I need to find a way to get them off without goobering the paint OR bending the fins.  Still, I'm curious what deeper inside is going to look like.  Not that I'm going to like it....
-1970 CB750 K0
-1980 KZ1300
-1976 Yellow GL1000
-1965 CA77 "Dream"
-1997 Valkyrie
-1975 Velosolex

Offline RAFster122s

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Re: 1971 CB750 K0/K1 Hybrid
« Reply #46 on: July 04, 2023, 05:17:29 PM »
That's no fun, finding that lurking beneath the covers...
If crank is beyond what you can polish out by hand, if any damage is there then APE or CycleX will have to rework your crank. Did the camshaft get lunched in the process?

Hope the rebuild isn't too awful.
Definitely gonna need to tear it down completely and understand what failed and why so you can address those issues. Then clean and clean some more to ensure the internals are spotless. Crank bearing are going to need to be flushed well to ensure no metal paste is lurking in the ball bearings and primary gear and starter clutch areas are clean. Cases will need to have all the passages flushed and chased to check for any metallic remnant from the failure.

David- back in the desert SW!

Offline BenelliSEI

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Re: 1971 CB750 K0/K1 Hybrid
« Reply #47 on: July 04, 2023, 06:19:49 PM »
Check out page 32 of my “Sandcast Found” project thread. My “bores” were really stuck to the cases and I made a cheap and easy puller with a bit of angle iron, a pair of threaded rods, and a 20” length of 2” X 8” lumber…….Worked a treat.
« Last Edit: July 05, 2023, 06:53:07 PM by BenelliSEI »

Offline Lucien Harpress

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Re: 1971 CB750 K0/K1 Hybrid
« Reply #48 on: July 05, 2023, 04:51:01 PM »
That bore puller idea is fantastic, and I'm absolutely stealing some version of the idea.  Thanks for the head's up!
-1970 CB750 K0
-1980 KZ1300
-1976 Yellow GL1000
-1965 CA77 "Dream"
-1997 Valkyrie
-1975 Velosolex

Offline BenelliSEI

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Re: 1971 CB750 K0/K1 Hybrid
« Reply #49 on: July 05, 2023, 06:52:24 PM »
That bore puller idea is fantastic, and I'm absolutely stealing some version of the idea.  Thanks for the head's up!

It did work well and only took about an hour to “build”. The angle iron is actually a scrap piece of a cheap, folding bed frame a neighbour threw out! Good Luck.