Author Topic: CB750 K0 Restoration - Round #3  (Read 45421 times)

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Offline markb

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Re: CB750 K0 Restoration - Round #2
« Reply #125 on: March 15, 2010, 11:34:41 am »
Wow great pics and looks great.  I love the red too.  I'm a big K0 and sandcast fan so I don't know how I missed this thread before.  I'll follow along now.
Mark
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Offline Old Scrambler

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Re: CB750 K0 Restoration - Round #2
« Reply #126 on: March 15, 2010, 01:03:38 pm »
Great build and review........I like the bags but have never liked to remove and clean after a day on the wet roads. One of these days I hope to start building my own K0. Right now its a total basket case or as someome said a "cardboard model". Guys like you are an inspiration to keep these bikes on the road.
Dennis in Wisconsin
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Offline Simpson

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Re: CB750 K0 Restoration - Round #2
« Reply #127 on: March 16, 2010, 09:58:45 pm »
I am curious to see how this works out. Id have thought it would have been more stable to connect the two bags by going under the fender (or attaching to the fender but having them connected). Looking forward to the update ;-). Still -very nice work and I am eager to try out my own bags to see if they will work for me.

cheers
Andy

Well after a small amount of testing and looking over my shoulder while riding, the additional support seemed to help neutralize the larger shakes. Meaning the large degree movement had been cut down significantly but the medium to small vibration movements are about the same. Later after wiggling each saddle bag in the garage I came to the conclusion, without changing the original cage design I might be hard pressed to smooth it out more.

-The chrome metal cage itself will flex under vibration
-The container vibrates within the cage by design

To make it better I would have to add a brace just to the cage in the back. This would be an additional supporting beam to improve the design from the cage flexing. Then tie down another point of the front side to the frame.
« Last Edit: March 16, 2010, 10:01:45 pm by Simpson »
1970 CB750 K0
1975 CL/CB 360 Mix

Offline Retro Rocket

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Re: CB750 K0 Restoration - Round #2
« Reply #128 on: March 16, 2010, 10:36:34 pm »
I am curious to see how this works out. Id have thought it would have been more stable to connect the two bags by going under the fender (or attaching to the fender but having them connected). Looking forward to the update ;-). Still -very nice work and I am eager to try out my own bags to see if they will work for me.

cheers
Andy

Well after a small amount of testing and looking over my shoulder while riding, the additional support seemed to help neutralize the larger shakes. Meaning the large degree movement had been cut down significantly but the medium to small vibration movements are about the same. Later after wiggling each saddle bag in the garage I came to the conclusion, without changing the original cage design I might be hard pressed to smooth it out more.

-The chrome metal cage itself will flex under vibration
-The container vibrates within the cage by design

To make it better I would have to add a brace just to the cage in the back. This would be an additional supporting beam to improve the design from the cage flexing. Then tie down another point of the front side to the frame.


You couldn't work some rubber into it some where to absorb the vibrations?

Mick
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Offline andy750

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Re: CB750 K0 Restoration - Round #2
« Reply #129 on: March 17, 2010, 04:26:14 am »
I am curious to see how this works out. Id have thought it would have been more stable to connect the two bags by going under the fender (or attaching to the fender but having them connected). Looking forward to the update ;-). Still -very nice work and I am eager to try out my own bags to see if they will work for me.

cheers
Andy

Well after a small amount of testing and looking over my shoulder while riding, the additional support seemed to help neutralize the larger shakes. Meaning the large degree movement had been cut down significantly but the medium to small vibration movements are about the same. Later after wiggling each saddle bag in the garage I came to the conclusion, without changing the original cage design I might be hard pressed to smooth it out more.

-The chrome metal cage itself will flex under vibration
-The container vibrates within the cage by design

To make it better I would have to add a brace just to the cage in the back. This would be an additional supporting beam to improve the design from the cage flexing. Then tie down another point of the front side to the frame.


Thank you for this! Its really very useful to me as well. I was thinking of using these types of bags/frame on a longer trip likely over some poor roads and your report confirms that its probably not the best idea. I think for the open road/tarmac they might be ok but if encountered poor road quality or hard-packed dirt road they might fall apart/flex/break at stress points.

much appreciated
Andy
Current bikes
1. CB750K4: Long distance bike, 17 countries and counting...2001 - Trans-USA-Mexico, 2003 - European Tour, 2004 - SOHC Easy Rider Trip , 2008 - Adirondack Tour 2-up , 2013 - Tail of the Dragon Tour , 2017: 836 kit install and bottom end rebuild. And rebirth: http://forums.sohc4.net/index.php/topic,173213.msg2029836.html#msg2029836
2. CB750/810cc K2  - road racer with JMR worked head 71 hp
3. Yamaha Tenere T700 2022

Where did you go on your bike today? - http://forums.sohc4.net/index.php?topic=45183.2350

Markcb750

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Re: CB750 K0 Restoration - Round #2
« Reply #130 on: March 17, 2010, 06:16:14 am »
Beautiful work on both the bike and the photos.

Mark

Offline Simpson

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Re: CB750 K0 Restoration - Round #2
« Reply #131 on: March 17, 2010, 08:15:51 am »

You couldn't work some rubber into it some where to absorb the vibrations?

Mick

The case mounts inside the cage by rubber mounts.
1970 CB750 K0
1975 CL/CB 360 Mix

Offline Simpson

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Re: CB750 K0 Restoration - Round #2
« Reply #132 on: March 17, 2010, 09:41:14 am »
Something magically seems to be happening this spring with my carb tuning... Last year I had to move the slow jet up to about #42-44 with the needle up one for the motor to run better. After my rebuild this winter it "seems" to be running better on #40 with the possibility of slightly still too rich meaning I have to move the the needles to center again. Perhaps... just perhaps I had some kind of intake leak.

This was all prompted the last week the ambient temps are going up around here and while approaching a stop the engine rpm would dive to a stall, giving the impression of a very overly rich slow jet. Additionally the air screws are also run better in the Honda spec range of about one turn.

Dang! What changed???

I did replace more of the intake boot clamps. Maybe the old ones gave an inconsistent squeeze to the rubber collars creating air passages. I guess I should replace the last 4!

Too early to tell, need more test miles.
Very excited
1970 CB750 K0
1975 CL/CB 360 Mix

Offline Simpson

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Re: CB750 K0 Restoration - Round #2
« Reply #133 on: July 03, 2010, 08:01:04 am »
AHHHHH snap!!!!  :o

Both support pieces broke on the saddle bags.
Time to fire up the mig.
1970 CB750 K0
1975 CL/CB 360 Mix

Offline Simpson

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Re: CB750 K0 Restoration - Round #2
« Reply #134 on: July 03, 2010, 08:02:30 am »
Support pieces welded and "painted".

Added additional support bar connecting cage on back side for good measure.
1970 CB750 K0
1975 CL/CB 360 Mix

Offline Simpson

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Re: CB750 K0 Restoration - Round #2
« Reply #135 on: October 04, 2010, 05:33:54 pm »
Engage full touring mode!  ;D



1970 CB750 K0
1975 CL/CB 360 Mix

Offline Simpson

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Re: CB750 K0 Restoration - Round #2
« Reply #136 on: October 06, 2010, 04:17:39 pm »
I've also added another alum beam to deaden the vibration coming from the unsupported left bottom of the saddlebags.
It's not a perfect solution but is cosmetically appealing because it is contained behind the saddlebag.

1970 CB750 K0
1975 CL/CB 360 Mix

Offline andy750

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Re: CB750 K0 Restoration - Round #2
« Reply #137 on: October 07, 2010, 07:56:18 am »
Excellent update and as always very thorough attention to detail. I like the overall look but wonder if the top box is too high. However it is very functional and thats what its all about. Notice any wind drag with the top box or adverse handling? My concern is having too much weight that far back on the rack will stress the mounting bolts. Not an issue if you just have clothes in there or lighter items. I also found a lot of vibration in the top box area - have you noticed it here as well or just in the side cases?

Anyway thanks for the update and cant wait to hear more road test stories -I have a vested interest in this!

thanks
Andy

Current bikes
1. CB750K4: Long distance bike, 17 countries and counting...2001 - Trans-USA-Mexico, 2003 - European Tour, 2004 - SOHC Easy Rider Trip , 2008 - Adirondack Tour 2-up , 2013 - Tail of the Dragon Tour , 2017: 836 kit install and bottom end rebuild. And rebirth: http://forums.sohc4.net/index.php/topic,173213.msg2029836.html#msg2029836
2. CB750/810cc K2  - road racer with JMR worked head 71 hp
3. Yamaha Tenere T700 2022

Where did you go on your bike today? - http://forums.sohc4.net/index.php?topic=45183.2350

Offline Simpson

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Re: CB750 K0 Restoration - Round #2
« Reply #138 on: October 07, 2010, 06:40:02 pm »
This week I head for the mountains for 2up touring with a couple vintage buddies (78 BMW, 76 550). I'll be in a better position to answer these questions Monday.

After about 100 miles testing, here's my findings.
The added beam helps reduce saddle bag vibration. Its still not perfectly solid due to the nature of the mounts.
There is just no satisfactory place to tie down the front bottom parts securely without it detracting from aesthetics or consuming passenger leg space.
The saddle bags, alum supports, top case are pretty light. The top rack is by far the heaviest item.
All the cases are super light almost to the point of being too fragile.
I got the small top case on purpose because I didn't want it to be a disturbance.
I haven't noticed additional vibration, whistling or strange handling characteristics yet.
It all feels solid. To judge the saddlebag vibration, I have to reach back and touch the cases while cruising.
Usually the biggest change is just riding with another person. My stopping distance get much longer of course.
That one disk brake heats up easy with all the extra energy to consume.

I did notice updating the swing arm bearing and steering needle bearing helps the bike dance the extra weight better.
I'll have more to report as this is my substitute Goldwing now. ;D

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1975 CL/CB 360 Mix

Offline andy750

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Re: CB750 K0 Restoration - Round #2
« Reply #139 on: October 10, 2010, 07:42:57 pm »
Thanks for the further comments Simpson. Very much appreciated.

I had a rack disaster this weekend while in the Adirondacks and while trying my new Hardigg im2300 top case (which is light at only 5lbs). The rack has been used before for a 2-up trip to the Adirondacks in 2008 and was loaded with heavier gear then.

Rack loaded and ready to go



Here is what happened...



The support bar snapped at the place just above the indicator light and the supporting bar from the top part of the rack also separated.



Now its worth noting that this weekend I met a long time CB750 rider from Montreal - he has been riding since the 70s on the same CB750 with his high school friends who also had CB750 (there are 4 of them) - each has about 100,000 miles on the bikes. His rack was also broken at exactly the same spot as mine had - he had used a splint to repair it and that worked ok...however now the other side was starting to show sign of wear. So to me this is evidence of a weak spot in the rear rack design.

Just something to keep in mind Simpson. He recommended that I add a support bar to the OEM rear rack and connect it to the added rear rack. Mine probably broke due to vibration at the back and rough roads that I was on. Maybe not enough weight on their to keep the vibrations down?

Anyway just thought Id update you on my rack experiences. Hope you have better luck!

cheers
Andy

Current bikes
1. CB750K4: Long distance bike, 17 countries and counting...2001 - Trans-USA-Mexico, 2003 - European Tour, 2004 - SOHC Easy Rider Trip , 2008 - Adirondack Tour 2-up , 2013 - Tail of the Dragon Tour , 2017: 836 kit install and bottom end rebuild. And rebirth: http://forums.sohc4.net/index.php/topic,173213.msg2029836.html#msg2029836
2. CB750/810cc K2  - road racer with JMR worked head 71 hp
3. Yamaha Tenere T700 2022

Where did you go on your bike today? - http://forums.sohc4.net/index.php?topic=45183.2350

Offline MRieck

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Re: CB750 K0 Restoration - Round #2
« Reply #140 on: October 11, 2010, 05:33:05 am »
Put a steel tube inside and have it welded.
Owner of the "Million Dollar CB"

Offline Simpson

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Re: CB750 K0 Restoration - Round #2
« Reply #141 on: July 24, 2011, 04:16:48 am »
I've got about 23k on the clock now and it just gets better and better. I have so many great adventures already.
The wife and I load this bike up and take it on some long trips.
This year we took it from NY to the Maine coast for lobster.
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1975 CL/CB 360 Mix

Offline Simpson

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Re: CB750 K0 Restoration - Round #2
« Reply #142 on: July 24, 2011, 05:31:17 am »
Some other shots. This was a trip to the Appomattox house in Virginia from the beach.  We followed the General Lee civil war trail. Very pretty ride.
« Last Edit: July 25, 2011, 09:33:20 am by Simpson »
1970 CB750 K0
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Offline hoodellyhoo

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Re: CB750 K0 Restoration - Round #2
« Reply #143 on: July 24, 2011, 07:14:12 am »
I'm glad to see such a gorgeously restored bike getting out there and really being USED. You have done a fantastic job.
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Offline brewsky

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Re: CB750 K0 Restoration - Round #2
« Reply #144 on: July 24, 2011, 05:40:31 pm »
Looking Good!

One question on your bag mounts.......do you not have a strut from the bottom front bag support to the passenger peg?

I have a the same set on my '78 and they do.
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Offline Greggo

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Re: CB750 K0 Restoration - Round #2
« Reply #145 on: July 24, 2011, 05:53:42 pm »
Wow.  What a bike!

Offline andy750

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Re: CB750 K0 Restoration - Round #2
« Reply #146 on: July 24, 2011, 06:49:44 pm »
I'm glad to see such a gorgeously restored bike getting out there and really being USED. You have done a fantastic job.

+1 great photos especially the one in the coffee shop window!

thanks
Andy
Current bikes
1. CB750K4: Long distance bike, 17 countries and counting...2001 - Trans-USA-Mexico, 2003 - European Tour, 2004 - SOHC Easy Rider Trip , 2008 - Adirondack Tour 2-up , 2013 - Tail of the Dragon Tour , 2017: 836 kit install and bottom end rebuild. And rebirth: http://forums.sohc4.net/index.php/topic,173213.msg2029836.html#msg2029836
2. CB750/810cc K2  - road racer with JMR worked head 71 hp
3. Yamaha Tenere T700 2022

Where did you go on your bike today? - http://forums.sohc4.net/index.php?topic=45183.2350

Offline Johnie

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Re: CB750 K0 Restoration - Round #2
« Reply #147 on: July 25, 2011, 06:09:52 am »
Nice pics and great job on the KO. Must never rain over there...
1970 CB750K0 - Candy Ruby Red
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Offline Simpson

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Re: CB750 K0 Restoration - Round #2
« Reply #148 on: July 25, 2011, 09:31:27 am »
Looking Good!

One question on your bag mounts.......do you not have a strut from the bottom front bag support to the passenger peg?

I have a the same set on my '78 and they do.

I've got 3 of the four back corners supported to the frame (shock bolt, fender/rear blinker bolt, and bottom side rear stop light bolts. Two support beams cross over from the last bottom corner which is favorable to the peg. I just could never figure out a graceful way of anchoring down that corner. If you could post a picture of that, I'd be very appreciative. 

Nice pics and great job on the KO. Must never rain over there...

I carefully plan around weather for all my trips. We take the cover and would pull over if a rain event would occur. To date i have not been caught too far away from home. Coming back from Vermont last month, I had severe thunderclouds forming around us. Mountain tops were continually getting lightening strikes and we ran the bike hard to beat it. After getting to our check point in New York, the rain caught us and hit hard about 10 minutes after arriving.
The wife so tired of my talking about it, she turned her mic off. "WOW, we gotta move, did you see how close that lightening was???!" 
« Last Edit: July 25, 2011, 09:39:09 am by Simpson »
1970 CB750 K0
1975 CL/CB 360 Mix

Offline Simpson

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Re: CB750 K0 Restoration - Round #2
« Reply #149 on: July 25, 2011, 09:38:00 am »
I actually originally got the top case for heavy items particularly wine.  The requirement to to safety carry 6 bottles.
Which it does nicely. Here is a shot of a ride to Kent Winery this spring a couple hours north of us.
Great place for a picnic.
1970 CB750 K0
1975 CL/CB 360 Mix