Author Topic: Potential 1970 CB750 K0/K1 Hybrid  (Read 9522 times)

0 Members and 1 Guest are viewing this topic.

Offline BenelliSEI

  • Really Old Timer ...
  • *******
  • Posts: 10,248
  • 1969 cb750
Re: 1971 CB750 K0/K1 Hybrid
« Reply #100 on: December 02, 2023, 04:48:52 PM »
Interested! Where did you find those?

Offline grcamna2

  • Not a
  • Really Old Timer ...
  • *******
  • Posts: 15,244
  • I love to restore & travel. Keep'em Going Strong !
Re: 1971 CB750 K0/K1 Hybrid
« Reply #101 on: December 02, 2023, 07:48:48 PM »
Nice set of 4) adapters  8)
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 BenelliSEI

  • Really Old Timer ...
  • *******
  • Posts: 10,248
  • 1969 cb750
Re: 1971 CB750 K0/K1 Hybrid
« Reply #102 on: December 02, 2023, 08:07:54 PM »
Nice set of 4) adapters  8)

Careful…. The Amazon price is for one. Motion Pro lists them for $3.99 each…..

Online newday777

  • Really Old Timer ...
  • *******
  • Posts: 5,544
  • Avatar is my 76 K6 in Colorado w/Cody on back 1980
Re: 1971 CB750 K0/K1 Hybrid
« Reply #103 on: December 02, 2023, 09:56:15 PM »
Nice set of 4) adapters  8)

Careful…. The Amazon price is for one. Motion Pro lists them for $3.99 each…..
WOW! It pictures 4 in the ad....but....the reviews say only 1 was shipped. I'd have been very pissed at Amazon for that false advertising !!!!

I have removed that stinking link to amazon
« Last Edit: December 02, 2023, 11:03:08 PM by newday777 »
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 grcamna2

  • Not a
  • Really Old Timer ...
  • *******
  • Posts: 15,244
  • I love to restore & travel. Keep'em Going Strong !
Re: 1971 CB750 K0/K1 Hybrid
« Reply #104 on: December 02, 2023, 10:31:35 PM »
Nice set of 4) adapters  8)

Careful…. The Amazon price is for one. Motion Pro lists them for $3.99 each…..

That's deceptive.  >:(
Motion Pro,ok.
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

  • I feel like a really really
  • Really Old Timer ...
  • *******
  • Posts: 12,523
  • SOHC4 member # 2605
Re: 1971 CB750 K0/K1 Hybrid
« Reply #105 on: December 02, 2023, 11:08:51 PM »
Try this one from Dennis Kirk
8.99 for set of 4 with two center carbs using longer ones so you can reach the tubes. Would need vacuum caps for these that fit snugly on them. I have a set and intend to leave them installed...
David- back in the desert SW!

Online newday777

  • Really Old Timer ...
  • *******
  • Posts: 5,544
  • Avatar is my 76 K6 in Colorado w/Cody on back 1980
Re: 1971 CB750 K0/K1 Hybrid
« Reply #106 on: December 02, 2023, 11:15:01 PM »
Try this one from Dennis Kirk
8.99 for set of 4 with two center carbs using longer ones so you can reach the tubes. Would need vacuum caps for these that fit snugly on them. I have a set and intend to leave them installed...

Link????
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 grcamna2

  • Not a
  • Really Old Timer ...
  • *******
  • Posts: 15,244
  • I love to restore & travel. Keep'em Going Strong !
Re: 1971 CB750 K0/K1 Hybrid
« Reply #107 on: December 02, 2023, 11:28:45 PM »
Try this one from Dennis Kirk
8.99 for set of 4 with two center carbs using longer ones so you can reach the tubes. Would need vacuum caps for these that fit snugly on them. I have a set and intend to leave them installed...

Was this set you mentioned originally intended for synch gauges? I imagine that's what they're all intended for? 
I do like how Yamaha and Kawasaki had the vacuum ports designed into their carb. rubber manifolds for hook-ups to vacuum controlled petcock,etcs.  because they work great for synch gauges also.
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

  • I feel like a really really
  • Really Old Timer ...
  • *******
  • Posts: 12,523
  • SOHC4 member # 2605
Re: 1971 CB750 K0/K1 Hybrid
« Reply #108 on: December 03, 2023, 06:47:48 PM »
Try this one from Dennis Kirk
8.99 for set of 4 with two center carbs using longer ones so you can reach the tubes. Would need vacuum caps for these that fit snugly on them. I have a set and intend to leave them installed...

Sorry

https://www.denniskirk.com/motion-pro/5mm-brass-carb-adapters-08-0013.p28276.prd/28276.sku


Carbtune in UK recommends for permanent installation you remove the seal and use a thread locking sealer and the sealer of the thread locking… Probably can do same for these but if it is not threaded to the hex in the adapter then it might not work…

Not nicely barbed like the short new MotionPro adapters they designed for permanent installation.
« Last Edit: December 03, 2023, 06:52:10 PM by RAFster122s »
David- back in the desert SW!

Offline BenelliSEI

  • Really Old Timer ...
  • *******
  • Posts: 10,248
  • 1969 cb750
Re: 1971 CB750 K0/K1 Hybrid
« Reply #109 on: December 03, 2023, 06:52:10 PM »
Try this one from Dennis Kirk
8.99 for set of 4 with two center carbs using longer ones so you can reach the tubes. Would need vacuum caps for these that fit snugly on them. I have a set and intend to leave them installed...

David….. if those are like the lengths that came with my Motion Pro unit, they are too long to leave in place and foul the choke mechanism on 1969-76 carbs.

Offline Lucien Harpress

  • Hot Shot
  • ***
  • Posts: 253
Re: 1971 CB750 K0/K1 Hybrid
« Reply #110 on: December 06, 2023, 05:27:47 PM »
Here's the one I went with.  Something like K&L was the brand, I think? 





I actually saw the type in a photo in the Clymer manual, and I was lucky enough to find an identical one for sale.  I only bought two- the ones on carb 1 and 4 are easy enough to get to with the smaller ones I already have. 

On to other parts of the bike.  I'm gradually doing what I can to mask off the cooling fins, so I can re-paint them a regular silver.  I've already got sections that are nearly brown- DON'T USE DUPLICOLOR CLEAR ON YOUR ENGINES.

-1970 CB750 K0
-1980 KZ1300
-1976 Yellow GL1000
-1965 CA77 "Dream"
-1997 Valkyrie
-1975 Velosolex

Offline BenelliSEI

  • Really Old Timer ...
  • *******
  • Posts: 10,248
  • 1969 cb750
Re: 1971 CB750 K0/K1 Hybrid
« Reply #111 on: December 07, 2023, 06:40:44 AM »
Cool bits! Thanks for posting!

Offline Kevin D

  • Old Timer
  • ******
  • Posts: 2,896
  • SE Michigan
Re: 1971 CB750 K0/K1 Hybrid
« Reply #112 on: December 07, 2023, 09:13:58 AM »
Quote
On to other parts of the bike.  I'm gradually doing what I can to mask off the cooling fins, so I can re-paint them a regular silver.  I've already got sections that are nearly brown- DON'T USE DUPLICOLOR CLEAR ON YOUR ENGINES.

Original had no clear coat on fins or cases, paint only.

Brushed/polished pieces originally had clear, and even it peeled off.
Cam cover, alternator cover, shift cover, front fork lowers
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

  • Hot Shot
  • ***
  • Posts: 253
Re: 1971 CB750 K0/K1 Hybrid
« Reply #113 on: January 03, 2024, 01:47:59 PM »
I was going to wait until I had it in-hand before posting, but it's going to be another couple weeks until I do, and I can't wait anymore.  Long story short, I got me a pretty good Christmas present this year- an ACTUAL K0 frame!





From the photos, the upper parts look okay.  The crossover tube concerns me, but it is what it is- I've got a welder if it's too rotted out.  It's a pretty late 1970, numbers-wise, but that's okay.  The important thing is that it didn't cost an arm and a leg- the last K0 frame I saw went for nearly $1500.  This was about a quarter of that.

I'm not dead-set on how much of the rest I'm converting to a 1970 bike.  Engine is staying a '71 since I paid a boatload to get it balanced.  The chainguard is staying metal because snapping my chain made me gunshy.  Carbs are a "maybe" if I can find a set for cheap (ha!), but getting a recessed ignition switch isn't worth doing.  Correct shocks might be nice, but those can wait.

It's a minor thing, to be sure.  But it makes me feel better knowing I have a legit (albeit pieced together) KO.
« Last Edit: January 03, 2024, 01:50:20 PM by Lucien Harpress »
-1970 CB750 K0
-1980 KZ1300
-1976 Yellow GL1000
-1965 CA77 "Dream"
-1997 Valkyrie
-1975 Velosolex

Offline BenelliSEI

  • Really Old Timer ...
  • *******
  • Posts: 10,248
  • 1969 cb750
Re: 1971 CB750 K0/K1 Hybrid
« Reply #114 on: January 03, 2024, 01:50:48 PM »
Good for you. FYI… regular key is right for that frame.

Offline Lucien Harpress

  • Hot Shot
  • ***
  • Posts: 253
Re: 1971 CB750 K0/K1 Hybrid
« Reply #115 on: January 03, 2024, 01:58:45 PM »
That's good to hear, actually.  I saw a couple threads stating that late in the 1970 production run they switched to the "standard" ignition switch, but I don't think I ever saw a specific frame number when that started.  Still, I'll take it.
-1970 CB750 K0
-1980 KZ1300
-1976 Yellow GL1000
-1965 CA77 "Dream"
-1997 Valkyrie
-1975 Velosolex

Offline BenelliSEI

  • Really Old Timer ...
  • *******
  • Posts: 10,248
  • 1969 cb750
Re: 1971 CB750 K0/K1 Hybrid
« Reply #116 on: January 03, 2024, 05:54:11 PM »
My K0 was slightly before that and it had the original, regular key set.

Offline Lucien Harpress

  • Hot Shot
  • ***
  • Posts: 253
Re: 1971 CB750 K0/K1 Hybrid
« Reply #117 on: January 15, 2024, 12:33:38 PM »
So right before Snowmageddon hit and the temperatures in my (uninsulated) garage got down into the single digits, I managed to get my newly rebuilt carbs back on and sorted.  Round one found me with some unexpected fuel leaks, so it was new float bowl gaskets and fuel line T o-rings all around.  I haven't gotten a chance to sync them yet, but I did managed to get it to run strong on all 4, at least on the mains.  Idle is wonky, but that's to be expected.



With my '70 frame hopefully showing up this weekend, I've started thinking how accurate I actually want to push this bike to.  On the one hand, I always like period-correctness.  On the other hand, it's always going to be a bit of a Franken-Yamiya bike.  So, that said, the only additional work I plan on doing is this:

-Carbs.  I'm REALLY undecided.  Not just because K0 come up so rarely.  I just feel like the later carbs are just easier to deal with.  Not to mention I'd have to switch up my bars, clutch cable, brake line, etc.  Still, if they come up for under a couple hundred bucks, maybe I'll snag a rack.  Not a priority.  (I'm kind of kicking myself for trading away the set that it originally came with, though.  :)  )

-Shocks.  I'm putting feelers out.  Mostly it's a combination of waiting for the right set to come along.  That said, I've been tempted to see if my machinist can turn down a set of K1/K2 legs to match the ridge of the K0 forks.  It's all a question of what I can do cheaper.

-Front Fender.  This is a new one.  Did any K0 ever run a double-rolled front fender?  That's what mine currently has (snagged it from a K3, and bolted to a K1/2 bracket).  However, looking at photos of 1970 bikes, it seems even the really late ones run single-cut fenders.  I'm I'm not above cutting a later fender to match.  Does anyone have any thoughts on this?

In any case, it's all pretty academic.  Hopefully once the temps climb a LITTLE bit I can get these carbs synced.  Then come spring-time I can at least ride it while I'm looking for parts.   ;D
-1970 CB750 K0
-1980 KZ1300
-1976 Yellow GL1000
-1965 CA77 "Dream"
-1997 Valkyrie
-1975 Velosolex

Offline BenelliSEI

  • Really Old Timer ...
  • *******
  • Posts: 10,248
  • 1969 cb750
Re: Potential 1970 CB750 K0/K1 Hybrid
« Reply #118 on: January 15, 2024, 04:26:12 PM »
Having built, owned, ridden every style of carb; I have to say I love my K1 the most. You should stick with a later style…..

I may have a decent “single slash cut” front fender left over. I’ll have a look this week, if you are interested?

Offline Lucien Harpress

  • Hot Shot
  • ***
  • Posts: 253
Re: Potential 1970 CB750 K0/K1 Hybrid
« Reply #119 on: January 15, 2024, 06:34:10 PM »
For sure, let me know what you've got.  We might be able to make something work.  Thanks!
-1970 CB750 K0
-1980 KZ1300
-1976 Yellow GL1000
-1965 CA77 "Dream"
-1997 Valkyrie
-1975 Velosolex

Offline BenelliSEI

  • Really Old Timer ...
  • *******
  • Posts: 10,248
  • 1969 cb750
Re: Potential 1970 CB750 K0/K1 Hybrid
« Reply #120 on: January 16, 2024, 10:23:56 AM »
Checked this morning and none left. Sorry about that! J.

Offline Lucien Harpress

  • Hot Shot
  • ***
  • Posts: 253
Re: Potential 1970 CB750 K0/K1 Hybrid
« Reply #121 on: January 16, 2024, 03:03:08 PM »
No worries.  Thanks for checking!

I've been doing a bit of research in the meantime, and it seems that, while the double-cut fenders for the '69s are more desirable, the single cuts seem oddly harder to find.  I still haven't ruled out trimming the back of the one I have, but I've got plenty of time to figure out what I want to do.  Replacements for both the rolled and double-cut seem easy enough to find, albeit a bit spendy.  So I really can't screw things up too badly.

At the end of the day, it's a pretty minor issue anyway.
-1970 CB750 K0
-1980 KZ1300
-1976 Yellow GL1000
-1965 CA77 "Dream"
-1997 Valkyrie
-1975 Velosolex

Offline BenelliSEI

  • Really Old Timer ...
  • *******
  • Posts: 10,248
  • 1969 cb750
Re: Potential 1970 CB750 K0/K1 Hybrid
« Reply #122 on: January 16, 2024, 05:38:14 PM »
“At the end of the day, it's a pretty minor issue anyway”

I agree…..The fender you have looks pretty good.


Offline jakec

  • Master
  • *****
  • Posts: 2,081
Re: Potential 1970 CB750 K0/K1 Hybrid
« Reply #123 on: January 21, 2024, 02:34:30 PM »
My bike has a later style fender on it. I have the original single cut fender that is messed up from PO's crash. I got a quote for $400 to have it repaired. I've heard the repop ones available on ebay are a nightmare and not worth the hassle. So I am in the same boat considering if the front fender being incorrect matters to me. To me, it looks very wrong and annoying to see the incorrect fender, but I know literally NO ONE else has a clue or cares.

As for the ignition I would save your money, my bike has the recessed ignition and the VIN is 18,000. I have a 1970 CL350 and the VIN is also 18,000s. It has a normal ignition. It's a tossup.

Regarding the carbs I would use the later style and just run a single cable, so you can keep using the normal switch pod. I have K1 carbs on my chopper and run a single cable. The correct carbs will never show up for cheap unless someone is really dumb.. Not to mention the hassle of setting them up. Mine are good now but it took weeks whereas K1 carbs were plug and play.

Finally for the shocks personally I wouldn't go to any lengths or $$$ on shocks unless it was to get nice IKON shocks. I looked into it and correct looking ones are $550.
1970 CB750 K0
1977 CB750 Chop
1997 XR650L

Offline Lucien Harpress

  • Hot Shot
  • ***
  • Posts: 253
Re: Potential 1970 CB750 K0/K1 Hybrid
« Reply #124 on: January 21, 2024, 05:02:13 PM »
Well, bit of good news coming from my end.

-First thing first, I finally got eyes on my '70 frame.  The good news is that the rust is a LOT better than the initial photo showed.  A bit of the loose, scaly stuff on the inner rear fender tabs, but nothing that goes deep.  There's some pitting on the neck, and a small hole I'll need to weld up on the left bottom runner, but nothing too bad.  It's more solid than my current K1, frame, in fact.

-I also managed to find a correct set of K0 forks.  Now, while they weren't cheap, at the same time they weren't THAT much more expensive than what CB750 forks usually go for.  And now I've got a set of K1/K2 forks that will probably be for sale, so that might help recouping some of the cost.

-As a last little bonus, I also managed to grab a K0 correct battery box.  Now, the differences from the one I have is EXCEEDINGLY minor (straight cut edges rather than scalloped), but I also managed to grab it for much cheaper than I've see them go for.

I'll have to wait for the weather to warm up before I get to painting all my new stuff, but and least now I got the stuff to do it.
-1970 CB750 K0
-1980 KZ1300
-1976 Yellow GL1000
-1965 CA77 "Dream"
-1997 Valkyrie
-1975 Velosolex