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Vmass
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Joined: Jun 21, 2017
Posts: 6
Location: Boston

PostPosted: Wed Jun 21, 2017 8:07 pm Reply with quote Back to top

Hi all,

I just picked up a 1981 CB750K from the original owner. The bike has been idle for 10 years plus.

I do have some experience in resurrecting bikes. This bike will need all the basic maintenance and some minor sprucing up. The carb tutorial I found here looks fantastic, looking forward to setting up the bench and getting to work.

The ugliest part of the bike is the inside of the tank. I will give it a few rounds of white vinegar and see where we stand.

Looking forward to learning my way around here.

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1981 Honda CB750K
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Vmass
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Joined: Jun 21, 2017
Posts: 6
Location: Boston

PostPosted: Wed Jun 21, 2017 8:16 pm Reply with quote Back to top

Image

Image

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1981 Honda CB750K

Last edited by Vmass on Wed Jun 21, 2017 8:28 pm; edited 2 times in total
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Vmass
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This Just In



Joined: Jun 21, 2017
Posts: 6
Location: Boston

PostPosted: Wed Jun 21, 2017 8:21 pm Reply with quote Back to top

I suspect I am going to get scolded for the large pictures. I can't seem to reduce the size in PB. I will keep trying.

Edit: Got it.

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1981 Honda CB750K
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pd750
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Joined: Aug 01, 2007
Posts: 23196
Location: Queen Creek , Arizona

PostPosted: Wed Jun 21, 2017 8:39 pm Reply with quote Back to top

Welcome to the site Vmass ... Smile

Very nice K .

And , good job on the pics . thumbs up

If you don't have good enough luck with vinegar , you might consider using wood bleach .

Here's an excerpt from : http://www.cb750c.com/modules.php?name=Forums&file=viewtopic&t=21342&highlight=bleach

pd750 wrote:

I rec'd my order of wood bleach ( Oxalic Acid ) and thought it best to test it before I subjected my fuel tank for rust removal .

I mixed a rather mild solution for the test . Here are some before and after pics :

Before :

Image

After :

Image

The parts looked almost this good after just a couple of hours bath , but I left them in over night to see if the deep reaches would be 'taken care of ' . The pulley was totally rusted .

I pulled the parts and rinsed them in a bath of hot water , then let them dry . The Oxalic acid seems to eat rust and leave a protective coating . I wiped some of that coating off the rear brake plate . Also note that the acid does not effect painted parts ( a big plus ) .

This was an experiment for me . My Simplex had a bit of rust forming in the gas tank . Not too bad considering the bike is 55 years old . I'd read that different acids worked for removing rust .

I used muriatic acid to clean my XT350 tank with decent results . That tank did flash rust and I retreated it and then neutralized the acid ASAP . It still formed a small amount of flash rust . I'm running it with an in line paper fuel filter and haven't had any problems .

The Simplex tank is a bit more rare and harder to find . I was reluctant to use muriatic acid in it for those reasons . Through research , I read about oxalic acid , sold as wood bleach . Oxalic acid is a lot safer to work with , but still requires due caution ( READ THE LABEL ) . It's not nearly as toxic as muriatic acid . It does NOT harm painted surfaces . It just eats rust and leaves a protective coating on the steel after being thoroughly rinsed with water .

I used a diluted mixture from what is suggested , which is 12 ounces to 1 gallon of water . I used 12 ounces to 2 gallons of water . Being as the solution was weaker , I left the mixture in the tank twice as long and the results are shown below .

This is what I used :

Image

Here's the rusted tank :

Image

And, here's the tank after being filled with oxalic acid for a couple of days :

Image

This stuff really does work great . I'll use it from now on when treating rust .


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sunshine New members , Please read and understand :

Please put the year and model of your bike in the signature section on your profile page and set "Always attach signature " to YES .
NOTE : In order for your signature to show up in posts you also have to check the box that's labeled "Attach signature (signatures can be changed in profile)" , just below the Quick Reply box at the bottom of threads , when making your next post . This only has to be done once . Thanks

New Members Read This Thread :
http://www.cb750c.com/modules.php?name=Forums&file=viewtopic&p=98405#98405

Picture Posting :
http://www.cb750c.com/modules.php?name=Forums&file=viewtopic&t=11546

Checklist :
http://www.cb750c.com/modules.php?name=Forums&file=viewtopic&p=68384
* *
Every man makes his own chains .
* *
A candle loses nothing by lighting another candle ...

"The only thing that you have which can never be replaced or recovered is your time. Use it well." Author Unknown .
* *
1982 CB750C - Sold > Looking for my next one .
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Vmass
This Just In
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Joined: Jun 21, 2017
Posts: 6
Location: Boston

PostPosted: Wed Jun 21, 2017 8:47 pm Reply with quote Back to top

Thanks, pd750. I will certainly consider wood bleach as an option. Sounds familiar, must have seen it used on another forum but have no experience with it. Thanks again.

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genesound
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Joined: Jul 24, 2007
Posts: 41234
Location: Studio City, CA

PostPosted: Wed Jun 21, 2017 10:44 pm Reply with quote Back to top

Welcome to here wave

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NMT - New Member's Thread, a Must Read, click here!!! - Information For New and Veteran Members.
Contains SITE RULES, how to enter required bike information in your signature, thread and picture posting...
Also some important DOHC wrenching tips, and some other information.
Kindly read this linked thread with the rules before posting
pictures or asking lots of questions that are already answered in it.

ŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻ
For Honda Shop Manuals (FSM), Click Here.
Click here to go fiche at Parts Pit Stop.
Click here to go fiche at Partzilla.
Sean's Bike Maintenance Checklist Click!
MacGregor Carb Rebuilding Manual, Click Here.
⊳⊳⊳⊳Learn to use the Search Engine Click Here.⊲⊲⊲⊲
Be sure to use Copper Anti-Seize on your Spark Plug Threads!
To Fix and Better Understand Your DOHC Honda Charging System, Click Here.

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___ImageCB1000C __ Image ___ CB1100FImage__
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holysmokes
Admin



Joined: Jul 25, 2007
Posts: 35635
Location: ridge road springfield nova scotia

PostPosted: Thu Jun 22, 2017 8:30 am Reply with quote Back to top

Hello

_________________
On a steel horse i ride
.mm to inch conversion chart
http://www.carolynrelei.com/inchchart.htm
picture posting
http://www.cb750c.com/modules.php?name=Forums&file=viewtopic&t=127
link to manuals + tech threads>
http://www.cb750c.com/modules.php?name=Forums&file=viewforum&f=5
valve adjust thread>
http://www.cb750c.com/modules.php?name=Forums&file=viewtopic&t=12173&highlight=shim
check charging video
https://www.youtube.com/watch?v=YvRe9g_2gyM
carb cleaning thread>
http://www.cb750c.com/modules.php?name=Forums&file=viewtopic&t=13611&highlight=carb
verifying ground
https://www.youtube.com/watch?v=SyNYlaoInUE
checking stator
https://www.youtube.com/watch?v=5v2LtHlvcqI
checking r/r
https://www.youtube.com/watch?v=kDx3zgOLShY
checking rotor ohms thread>
http://www.cb750c.com/modules.php?name=Forums&file=viewtopic&t=1477&highlight=ohms
torque values thread >
http://www.cb750c.com/modules.php?name=Forums&file=viewtopic&p=81382#81382

http://www.cb750c.com/modules.php?name=Forums&file=viewtopic&t=52
http://www.cb750c.com/modules.php?name=Forums&file=viewtopic&t=6935&highlight=shadow
http://www.weather.com/weather/extended/l/CAXX1175
People are just as happy as they make up their
minds to be.” ― Abraham Lincoln
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