1970 CB750 K0 engine -Need a frame

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cfairweather
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1970 CB750 K0 engine -Need a frame

#1

Post by cfairweather »

I came upon a 1970 CB750 K0 engine yesterday and need a K0 frame. If you know of someone that has one, please let me know. It is rare to find an engine these days, but this guy had it stored in a shed for 35 years. He even forgot he had it but the wind blew the roof off the shed and he discovered it. He then put a tarp over the engine and left it out in the weather for years and of course, the tarp blew away and the engine filled up with dirt, spiders, pine needles, etc. The engine was partially disassembled so I am sure everything inside is too rusty to use; however, the case looks fine and that is the important part. I am going to replace the inside parts with a K3 engine that I bought and get it running. Then will either sell the engine or if I find a frame, make a K0 motorcycle. The engine is a die cast.
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Lucien Harpress
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Re: 1970 CB750 K0 engine -Need a frame

#2

Post by Lucien Harpress »

If you haven't already, I'd check with the SOHC/4 guys. It's probably going to take some doing to get what you want, but if there's any leads out there, they're a great group to start with.

http://forums.sohc4.net/index.php
1997 Valkyrie- Light Cutomization, but Too Busy Riding
1980 KZ1300- Bike's Haunted
1976 GL1000 (Yellow)- It Runs (Poorly) and Doesn't Leak (Mostly)
1974 Velosolex 3800- Better Than Walking
1972 CB750- Broke the Chain And Ate the Motor
1969 CT90- The Most Fun You Can Have on 90ccs.
1965 CA77 Dream- Needs a Full Teardown, but Complete

All advice I give is only valid until an expert corrects me.
cfairweather
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Re: 1970 CB750 K0 engine -Need a frame

#3

Post by cfairweather »

Thanks. I am a member on that forum and put a post there too. Yes, it is a great forum for the CB750s.
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desertrefugee
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Re: 1970 CB750 K0 engine -Need a frame

#4

Post by desertrefugee »

Geez, a die cast motor. Great find.
- Life is not about waiting for the storms to pass. It's about learning to ride in the rain.
cfairweather
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Re: 1970 CB750 K0 engine -Need a frame

#5

Post by cfairweather »

Here is what I found inside the K0 case and I had already vacuumed a lot out before taking this picture.
DSCN4170.JPG
DSCN4170.JPG (217.75 KiB) Viewed 1469 times
I now have everything out of the case and will begin cleaning it.
Paola Zago
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Re: 1970 CB750 K0 engine -Need a frame

#6

Post by Paola Zago »

incredible! in Germany an incomplete, unblocked sand cast engine was sold for 5000 euros!
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flyin900
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Re: 1970 CB750 K0 engine -Need a frame

#7

Post by flyin900 »

Paola Zago wrote: Thu May 26, 2022 4:33 am incredible! in Germany an incomplete, unblocked sand cast engine was sold for 5000 euros!
Paola
IMO….The sad part is younger newbies to the classic car or bike world have no background or interest in many of these cars or bikes from the 60’s or 70’s. One day this will all end as everything does, so just like musical chairs, someone Is left holding a lot of expensive stuff that no one wants.

I cannot understand the interest in these SOHC CB 750 early bikes. I get the nostalgic stuff for sure, yet the DOHC models from the late 70’s are so much better in every way.

BTW I owned an early CB750 back in the late 60’s and they were both ground breaking, yet long in the tooth by 1972, when the Kawasaki KZ900 or Suzuki DOHC bikes appeared on the scene. crossy.gif
Current Bikes:

1966 CL77 - Honda 305cc - Dual purpose - "Gentleman's Scrambler" was a period moniker.
1967 CL175K0 - Low production number with #802 engine serial- winter 2019/2020 full restoration.
1972 CB350F - Baby Four with low mileage - Cosmetic refresh to the next level 2021/2022.
1978 CB550K - Very original bike with only 7499 Km. from new - light cleanup and refresh done.
1983 CB1100F - Canadian model - DOHC Supersport in pristine low kilometre condition from new.
1984 GL1200 - Standard model in showroom condition - two owner bike from new.
1984 CX650E - Restored summer 2017 - a rare Eurosport model - excellent one owner bike.
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Lucien Harpress
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Re: 1970 CB750 K0 engine -Need a frame

#8

Post by Lucien Harpress »

Yeah, strange things happen when things become "collectable". I get that the SOHC 750s were groundbreaking at the time, but as an owner and a rider (at least when I'm not breaking it), they are very average bikes. Revolutionary in the 70s, but painfully "okay" today. But by now it's definitely nostalgia, but a nostalgia that drove prices up enough that they hit a point to be self-sustaining. This is expensive, so it has to be good, which makes other examples more expensive. Heck, the prices for my little Trail 90 are through the roof for what's in essence a throw-away moped.

But there IS a difference between owning a bike because it's a quality product and because of something else (be it nostalgia, an example of quirky engineering, or what have you), isn't there? All my stuff I own for different reasons.

The Valk? I need a "normal" bike. GL1000? A Goldwing without a fairing and a motorcycle with a car motor are both deeply weird. CB750? I rebuilt it (relatively) cheap. KZ1300 and my Honda Dream? I'm a masochist. The Solex? ....listen, we all have bad days, okay? :lol:

Point is, sometimes the heart just wants what it wants.
1997 Valkyrie- Light Cutomization, but Too Busy Riding
1980 KZ1300- Bike's Haunted
1976 GL1000 (Yellow)- It Runs (Poorly) and Doesn't Leak (Mostly)
1974 Velosolex 3800- Better Than Walking
1972 CB750- Broke the Chain And Ate the Motor
1969 CT90- The Most Fun You Can Have on 90ccs.
1965 CA77 Dream- Needs a Full Teardown, but Complete

All advice I give is only valid until an expert corrects me.
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Liam
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Re: 1970 CB750 K0 engine -Need a frame

#9

Post by Liam »

Lucien Harpress wrote: Sun Sep 04, 2022 2:52 pm

Point is, sometimes the heart just wants what it wants.
And long may that continue. The coolest people that ever lived are alive right now or have passed in my lifetime.
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