Author Topic: 1970 CB750 K0 Project - Interesting Story Told By The Motorcycle  (Read 4234 times)

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Offline cfairweather

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1970 CB750 K0 Project - Interesting Story Told By The Motorcycle
« on: September 02, 2024, 04:57:52 AM »
I recently bought a 1970 CB750 from a young man in Boulder, CO and it came with a documented story from the previous owner, Ryder3 (Ken).  I had actually bid on this bike a couple of years ago, but lost to the young man in Boulder.  He tinkered with the bike, but the "project" really didn't go anywhere, so he decided to list it on Craigslist again.  I was determined not to let it slip away again and made him a fair offer which he accepted.  I promised him I would make it beautiful again.  Initially, I wanted to go back with all Honda parts, but due to the costs, I decided to do a mix of OEM and replicated parts with the goal of trying to improve the bike wherever possible.  To start this thread, I am posting the story that came with the motorcycle, written by Ryder3 from the motorcycle's perspective.  I will try and contact Ryder3 to update him on the project.  Enjoy the story:

Hello, my name is CB 750 Honda K0 and I was born in 1970.  Since bikes usually live out their owners, I want Ryder4 to know where I came from and where I have been.  Assembled in Wako, Saitama, Japan and given the VIN number CB7501034704, I was sold to Ryder1. 

Ryder1 was a young Japanese boy who bought me in Sasebo, Japan, but his feet barely touched the ground.  After only a few months, He sold me.

Ryder2 was a young American sailor and was sent back to the United States after only three months.

Ryder3, my present Ryder bought me in December of 1971 for 270,000 yen or $750.00.  Rember when it was 360 yen to 1 dollar?  His ship, the Ajax was tied to a pier in Sasebo Japan where I spent most of my nights.  We travel to Nagasaki and saw Tokyo Rose’s tower and toured the island of Kyushu.  When Ryder3 went to Vietnam, I spent months on the pier parked on the dock. 

Ryder3’s ship was going to San Diego for the first time in about 15 years and I hitched a ride in the hole with hundreds of other bikes.  We were all imports, no to be exported, but they let us in the US anyways.  I still have my original Speedometer in Kilometer per hour.

We stopped in Hawaii for a few days.  I could not believe Americans drive on the right had side.  Within the first few weeks of being in the United States, Ryder3 thought he could impress two young ladies and revved me up.  When the light turned green, the cars started to go and then stopped suddenly.  By that time my clutch was out and I rear ended the car in front of me.  Ryder3 went over the handlebars and landed on the car’s trunk.  A tow truck took me to a motorcycle repair shop where I got an American front fender.  The Japanese version had a place for a license plate.  Ryder3 learned his lesson and never looked at a woman on the side of the road again.

Spent the next six months parked at an apartment complex in San Diego.  During this time, we explore the southern California coast and went to Tijuana to watch the bullfights.

In 1972, Ryder3 was discharged from the Navy.  He bought a van and his best friend from Massachusetts flew out to do a road trip.  Sometimes I road in the back of the van, sometimes Ryder3 rode me, like into Las Vegas or into the Grand Canyon.  In Nevada, Ryder3 decided to open me up to 129 mph...I was not red lined, but Ryder3 backed off.  He also rode min into Canada and we saw Niagara Falls.  Stopped at Watkins Glen for a car race and finally made it to Massachusetts. 

That summer, made it to Hampton Beach NH so I can now say I’ve been from Mexico to Canada and from the Pacific coast to the Atlantic coast.

At Ryder3’s parents house, I was parked right outside of the bedroom window.  One winter, Ryder3 was hospitalized and I was left parked under the house’s roof overhang.  I was totally encased in ice from the dripping water from the roof turning to ice.  The spring sprang and Ryder3 zapped me with 12 volts and I started right up.

From 1972-1976, I took Ryder3 to college almost every day.  My thrill was catching air on the road leading to the school.  Ryder3’s thrill was parking next to whatever building he had a classroom.

In 1977, I moved to New Hampshire and sat out the blizzard of 1977 in a parking lot under a tarp at a housing complex. 

In 1978, I almost went to the junkyard.  We were following two cars.  Since Ryder3 thought he was the fastest thing around, he decided to cross the double yellow line and pass.  As soon as he pulled out, I saw the biggest possible thing on the road coming at us.  What do you think it could be?  It was an 18-wheeler, hauling a house, not a mobile home.  I could see the headlines now…biker run over by a house.

In 1980, Ryder3 bought a house and I had my own shed except I shared it with a lawnmower.  During this time, we took trips to Martha’s Vineyard, Boston, Maine, New Hampshire, Rhode Island and Connecticut. 

In 1994, while driving down the back roads, a tree trunk fell about 5 feet in front of me.  When I rolled over the branch, it punctured my number 2 pipe.  If it fell a second later, it would put a hole in Ryder3.

In 1995, I got sick and had low compression in my #3 cylinder and I sat in a shed for the next five years.

In 2000, an 18-wheeler took me to Colorado.  Where I sat under a tarp for two years.  Ryder3 went to three motorcycle shops looking for someone to rebuild me.  One shop said the bike is older than any of my mechanics.  Finally found a guy who worked on old Honda’s and I was rebuilt.  Also got a new #2 pipe, new tires, had all aluminum buffed out and left the shop with 63,000 KM (39,0000 miles) on my speedometer.  When I got home, I had a great spot parked in his garage.  Colorado weather was great and I was ridden almost every day until Ryder3 retired in 2014 and I had 80,000 KM (49,000 miles) on my speedometer.  The next few years, Ryder3 and I only did errands to the store.  Then he only rode me once a year until 2019, then stopped.  (Like Jacky Paper, he came no more.)  I am now looking for Ryder4.

Hello, I am Ken (Ryder3) and it is time to pass the bike on.  It’s drivable, but in rough shape. 

It has been in a storage shed in Thornton with no gas or oil and the battery disconnected since 2021.  It was running fine before I put it there.  I have a clear title from Colorado and it is still registered till June.  I am in Massachusetts and won’t be in Colorado till the end of April to show it. 

Unsure what its really worth, but would like to take a few bids and sell it when I get back.  I’ll only be there for a few days to show it.  Glad to answer any questions.

 -------------
Now for the rest of the story, as told by the motorcycle. 

Ryder4 was a young man in Boulder, Colorado that bought me for about $3000.00.  He tinkered with me for a couple of years and in 2024, he sold me to Ryder5, Cedric Fairweather.  Cedric promised to restore me to my former glory and make me beautiful again.  So far, he rebuilt my engine, painted my frame, rebuilt the speedometer and changed it to MPH using parts from a K1.  He is fixing me up like new.
Here is what I looked like when he started.




« Last Edit: September 02, 2024, 05:02:37 AM by cfairweather »

Offline newday777

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Re: 1970 CB750 K0 Project - Interesting Story Told By The Motorcycle
« Reply #1 on: September 02, 2024, 06:02:32 AM »
Mr Motorcycle you have quite the story to your life. I may have seen you in passing in NH while you rode around our roads as I spent time visiting my brother in Lee while he was going to collage at UNH during 1972-1974.
I'm sure you will be loved and your deficiencies rectified by Mr Cedric.
Sincerely
Mr Stu
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 69cb750

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Re: 1970 CB750 K0 Project - Interesting Story Told By The Motorcycle
« Reply #2 on: September 02, 2024, 06:20:36 AM »
Quote
Ryder3, my present Ryder bought me in December of 1971 for 270,000 yen or $750.00
CB750-1034704 was build in May 1970
CB750-1034704 was a year and seven months old in December 1971.
$750 was a low price.


I owned CB750-1034922


Offline denward17

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Re: 1970 CB750 K0 Project - Interesting Story Told By The Motorcycle
« Reply #3 on: September 02, 2024, 07:01:41 AM »
Nice story Cedric, enjoyed that reading.

Offline MauiK3

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Re: 1970 CB750 K0 Project - Interesting Story Told By The Motorcycle
« Reply #4 on: September 02, 2024, 07:38:27 AM »
Keep us posted on progress.
1973 CB 750 K3
10/72 build Z1 Kawasaki

Offline RAFster122s

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Re: 1970 CB750 K0 Project - Interesting Story Told By The Motorcycle
« Reply #5 on: September 02, 2024, 08:08:05 AM »
Welcome and entertaining story
David- back in the desert SW!

Offline cfairweather

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Re: 1970 CB750 K0 Project - Interesting Story Told By The Motorcycle
« Reply #6 on: September 02, 2024, 10:11:54 AM »
When you look at that picture of the bike in the first post, you might get the idea that this bike was in pretty good shape, and you would be very wrong.  This bike was in terrible shape including the engine which supposedly was "rebuilt" about 13,000 miles ago.  The mechanic did not have a clue about what he was doing.  The engine was very close to self destruction because the cam chain tensioner was totally shot and was wobbling inside.  One interesting thing about this CB750 was apparently unique to the Japan version.  Look at the picture below and you will see a red indicator light mounted in the top triple tree brace.  I think this light was a warning light that came on if the rider went beyond a certain speed.  If you look at the wiring harness, you will see a silver component next to the flasher that is part of the warning system.  I may not be correct about this, so maybe someone has more information about this unique system. 

Offline BenelliSEI

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Re: 1970 CB750 K0 Project - Interesting Story Told By The Motorcycle
« Reply #7 on: September 02, 2024, 10:41:47 AM »
Cedric…… Great tale, thanks for sharing! Will be following your progress. Best wishes for total success.

Offline Johnie

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Re: 1970 CB750 K0 Project - Interesting Story Told By The Motorcycle
« Reply #8 on: September 02, 2024, 10:48:05 AM »
Following for sure! Great story...
1970 CB750K0 - Candy Ruby Red
1973 CB750K3 - Candy Bacchus Olive or Sunflake Orange
1970 Chevy Chevelle SS396 - Cortez Silver
1976 GL1000 Sulphur Yellow

Oshkosh, WI  USA

Offline 69cb750

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Re: 1970 CB750 K0 Project - Interesting Story Told By The Motorcycle
« Reply #9 on: September 02, 2024, 11:13:30 AM »
Quote
One interesting thing about this CB750 was apparently unique to the Japan version.  Look at the picture below and you will see a red indicator light mounted in the top triple tree brace.
Speed warning light - http://forums.sohc4.net/index.php?topic=138254.0

Offline HondaMan

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Re: 1970 CB750 K0 Project - Interesting Story Told By The Motorcycle
« Reply #10 on: September 02, 2024, 02:18:31 PM »
Boy, you've got a handful of fun there, Mr. C.! :D
See SOHC4shop@gmail.com for info about the gadgets I make for these bikes.

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Blood is thicker than water, but motor oil is thicker yet...so, don't mess with my SOHC4, or I might have to hurt you.
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Link to Hondaman Ignition: http://forums.sohc4.net/index.php?topic=67543.0

Link to My CB750 Book: https://www.lulu.com/search?adult_audience_rating=00&page=1&pageSize=10&q=my+cb750+book

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Offline cfairweather

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Re: 1970 CB750 K0 Project - Interesting Story Told By The Motorcycle
« Reply #11 on: September 03, 2024, 04:22:51 AM »
Thank you for your comments and information about the red speed light indicator.  This is a great forum and you guys have a ton of information to help people get and keep these old classics on the road.  You should be very proud of yourselves.  I am not going to use the light or harness, but will keep it with the bike for historical reasons. 

Before I get started posting about the project, let me tell you a little bit about myself.  I have been riding motorcycles since I was about 8 years old and I am currently 68 years old.  I grew up working in my dad's TV shop and he taught me to do any and everything without fear of failure.  So, I took many things apart and sometimes got them back together :).  My brother and I once took the engine out of his new 71 Volkswagen just to see how hard it would be.  Crazy, right...  I broke a lot of stuff along the way, but I also learned a lot about how things work.  I spent 20 years in the Airforce and was an IT Manager for 25 years after that.  I also have developed a lot of software along the way, but my passion for motorcycles has always been part of my life.  I have restored over 20 motorcycles, mostly GL1000s, but this bike is my 7th CB750 restoration.  I had two CB750s while in high school in the early 70s.  The first one was a new 1972 model that I wrecked and it is a miracle that I survived the accident. The next one was a used 1970 sand cast, but I did not realize what I had at the time.

Now, I will try and share some of the highlights as I restore this special motorcycle.  I have always wanted to restore a 1970 K0 model since I previously had one.  I usually do the paint myself, but since the body parts on this bike were in such bad shape, I decided to buy a complete body set from Yamiya.  His parts are top quality and I bought the red set so this bike will look like it did when it was new.  I also purchased a set of no number pipes from Yamiya because the pipes were not in good shape. I have already rebuilt and tested the engine, so today I will tell you what I did to it. 

I replaced the primary chains with the Cycle-x cryo treated primary chains and installed a new Honda tensioner.  Ken at Cycle-X recommended that I use his 8% stronger spring with the tensioner, so I took his advice.  Ken also sold me a new cam chain,  tensioner parts, higher compression pistons, heavy duty cylinder studs, a premium gasket set with a MLS head gasket.  I replaced the cush drive with a low milage used one.  At some point, someone installed an R7 cam in the engine, so I used a low milage R1 that I had from a previous K1 project.  Cycle-X did a great job with the head and cylinder machine work.  I usually use copper coat on the head gasket, but I installed the MLS gasket dry as recommended by the manufacturer.  The head and cylinder were freshly milled, so I was confident there would be no leaks.  The pistons have a ceramic coating on the top and some other protective coating on the sides.  They also have a small dome on top to increase compression.  I rebuilt the oil pump with the springs included in the Cycle-X gasket set.  The oil pressure is higher than a stock pump with this modification. 

Here is a picture of the engine on my “test stand.”  I just bolted it down to my motorcycle stand and started it.
« Last Edit: September 03, 2024, 04:30:47 AM by cfairweather »

Offline newday777

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Re: 1970 CB750 K0 Project - Interesting Story Told By The Motorcycle
« Reply #12 on: September 03, 2024, 05:13:27 AM »
We lived similar lives through the 70s Cedric. I also pulled a 71 vw motor out, myself..and rebuilt it...probably the beginning of why my back is the way it is today...
Keep the story going.
I plan to cut up a rusted frame I have to build a motor test/run in mule. I've brought back to life 3 goldwings and am working on my 3rd 750(and 7 in the que line up)
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 cfairweather

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Re: 1970 CB750 K0 Project - Interesting Story Told By The Motorcycle
« Reply #13 on: September 03, 2024, 06:26:53 AM »
One thing that I wanted to share as a tip... after I torque the head bolts up to 18lbs, I use a portable propane heater and heat up the engine to operating temperature.  It takes about 30 minutes to heat it up.  Then I let it cool down and use the same setting, 18lbs, to see if any of the bolts turn.  Every time I have used this procedure, some of the bolts will turn.  Then I did the final torque to 21lbs.  I probably should have heated it up again after the final torque and retorqued it again, but it will be fine.  I think this heat cycle procedure is important and will reduce the possibility of leaks.

Offline cfairweather

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Re: 1970 CB750 K0 Project - Interesting Story Told By The Motorcycle
« Reply #14 on: September 03, 2024, 06:47:33 PM »
Today, I also completed the gauges.  I restored the gauges using replacement faces and new plastic cases.  The speedometer was a bit of a challenge because I wanted to change it to a MPH gauge.  I bought a used K1 speedometer and converted it to a K0 version, but I had to use the metal bottom from the original K0 gauge.  The metal bottom on the K1 is different from the K0.  I bought all new rubber and chrome parts to make them look brand new.

Offline newday777

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Re: 1970 CB750 K0 Project - Interesting Story Told By The Motorcycle
« Reply #15 on: September 03, 2024, 06:50:23 PM »
Those look good. We'll done.
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 cfairweather

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Re: 1970 CB750 K0 Project - Interesting Story Told By The Motorcycle
« Reply #16 on: September 03, 2024, 07:06:31 PM »
Thanks Stu.  These K0 gauges were easy to restore because the only thing I had to paint was the orange on the needle.  The original chrome K0/K1 back plates are getting very hard to find, but JT Marks had one last set for about 150.00 bucks. 

Offline bek1966

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Re: 1970 CB750 K0 Project - Interesting Story Told By The Motorcycle
« Reply #17 on: September 04, 2024, 08:02:36 AM »
Great story, following!
1971 CB750 K1 - Candy Gold
1971 CB500 K0 - Star Light Gold
1974 CB350 F1 - Glory Blue Black

Pleasant Prairie, Wisconsin

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Re: 1970 CB750 K0 Project - Interesting Story Told By The Motorcycle
« Reply #18 on: September 04, 2024, 08:11:57 AM »
Terrific story and a very nice bike.
Too often the story is long lost on an old bike.
Although I would have left the JDM parts on it.
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 Stev-o

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Re: 1970 CB750 K0 Project - Interesting Story Told By The Motorcycle
« Reply #19 on: September 05, 2024, 08:47:41 AM »
Great story...thx for sharing.
'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline CBJoe

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Re: 1970 CB750 K0 Project - Interesting Story Told By The Motorcycle
« Reply #20 on: September 05, 2024, 08:51:32 AM »
Very cool story!  Super unique thing to get with a purchase
'07 Bonneville Black
'15 Moto Guzzi California 1400
CB750K2 Hot Rod Revival http://forums.sohc4.net/index.php/topic,171693.0.html
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Offline cfairweather

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Re: 1970 CB750 K0 Project - Interesting Story Told By The Motorcycle
« Reply #21 on: September 05, 2024, 06:41:27 PM »
Today, I rebuilt the oil hoses.  I put them together and had a local hydraulic company crimp them.  You can barely see the crimp marks. 

Offline cfairweather

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Re: 1970 CB750 K0 Project - Interesting Story Told By The Motorcycle
« Reply #22 on: September 07, 2024, 06:43:46 PM »
I worked on the front brakes today and wanted to show you a few things.  I have taken many brake calipers apart over the years, but I never saw RTV used and I would not recommend it ;D .  The master cylinder has a threaded hole for the mirror and unfortunately, it was stripped out.  I typically use Time-Sert threads to fix this type of problem, but I didn't have any 10mm threads.  No problem, I will be creative and come up with a solution...  Take a look at the picture of the stainless steel nut, with the modified nut and the drilled out mirror hole.  I used my lathe to modify the nut.  The nut flange was just the right diameter.   I used JB Weld and pressed the modified nut into the hole.   See the picture with the final results.  I will be painting the master black and the concave cap silver.

« Last Edit: September 07, 2024, 06:48:22 PM by cfairweather »

Offline cfairweather

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Re: 1970 CB750 K0 Project - Interesting Story Told By The Motorcycle
« Reply #23 on: September 07, 2024, 07:12:35 PM »
I painted most of the black parts but still have a few to spray.  When I did the frame, I removed all the paint using paint remover and sand paper.  Then I sprayed epoxy primer over the bare metal followed with Jet Black Urethane paint from The Coating Store.  Great paint and great price.  I used an activator with the black to make it very hard. 
« Last Edit: September 07, 2024, 07:18:01 PM by cfairweather »

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Re: 1970 CB750 K0 Project - Interesting Story Told By The Motorcycle
« Reply #24 on: September 07, 2024, 09:54:30 PM »
I worked on the front brakes today and wanted to show you a few things.  I have taken many brake calipers apart over the years, but I never saw RTV used and I would not recommend it ;D .  The master cylinder has a threaded hole for the mirror and unfortunately, it was stripped out.  I typically use Time-Sert threads to fix this type of problem, but I didn't have any 10mm threads.  No problem, I will be creative and come up with a solution...  Take a look at the picture of the stainless steel nut, with the modified nut and the drilled out mirror hole.  I used my lathe to modify the nut.  The nut flange was just the right diameter.   I used JB Weld and pressed the modified nut into the hole.   See the picture with the final results.  I will be painting the master black and the concave cap silver.

Nice solution for the master cylinder. It's good to have a lathe.
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