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Author Topic: from cardboard boxes to a cb750  (Read 6167 times)

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Offline KirkBurner

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from cardboard boxes to a cb750
« on: July 17, 2014, 12:25:01 PM »
Well.. I was "lucky" to come a cross a project at the quarter of the cost of a running bike.
Story behind this was that the guy had 6 other projects and this one had stalled and he needed to get it out of sight.

The fist goal here now is to get it running, and getting plates on it. Goal is March for the plates with a running motor.
Then to see if it will get modified in any way or passed on for new projects.

the worst thing about this project is.. its summer and I have two bikes with engines open...
« Last Edit: July 17, 2014, 12:27:16 PM by KirkBurner »
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Offline KirkBurner

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Re: from cardboard boxes to a cb750
« Reply #1 on: July 17, 2014, 12:53:07 PM »
Golden parts?

the PO got replacements.. but when would people get these parts...?
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Offline KirkBurner

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Re: from cardboard boxes to a cb750
« Reply #2 on: July 17, 2014, 01:30:25 PM »
Painting beeing done....

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Offline KirkBurner

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Re: from cardboard boxes to a cb750
« Reply #3 on: July 17, 2014, 01:32:08 PM »
Came this far the other day,

I have been reading up on afew of the threads here, getting inspired...

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Offline greenjeans

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Re: from cardboard boxes to a cb750
« Reply #4 on: July 17, 2014, 01:42:52 PM »
I think this is the best way to really learn the ins and outs of your CB.  The first motorcycle I ever had came just like yours.  I sorted through the parts,
picked the best looking of the parts and put it together following my trusty manual.

Good progress - at least with a roller, it looks like a motorcycle.  Keep it going.
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Yep, I'm the kid that figured out how to put things back together...eventually.

Offline KirkBurner

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Re: from cardboard boxes to a cb750
« Reply #5 on: July 17, 2014, 02:26:00 PM »
Mr GreenJeans.. its my second... but this one is original..

I started to tread the wires through the handlebars today but forgot to take a picture
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Offline calj737

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Re: from cardboard boxes to a cb750
« Reply #6 on: July 17, 2014, 04:06:54 PM »
You would be very wise to install a frame kit now. It will make install, service, and future removal a lot easier! Especially, if upon assembly, you discover  a problem in the top end.
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Offline Tews19

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Re: from cardboard boxes to a cb750
« Reply #7 on: July 17, 2014, 04:20:59 PM »
Subscribed and good luck on the build. Looks to be an early 750 with a unicorn triple tree.
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Offline KirkBurner

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Re: from cardboard boxes to a cb750
« Reply #8 on: July 21, 2014, 11:09:26 AM »
So today I put on the gauges... And rear fender...

I also found out that the cheap paint remover I got works wonders.. So it seems I can get this project done even cheaper

I am missing alot of bolts so.. Its slow getting there...

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Offline edwardmorris

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Re: from cardboard boxes to a cb750
« Reply #9 on: July 21, 2014, 11:16:23 AM »
Quote from: KirkBurner on July 21, 2014, 11:09:26 AM
I am missing alot of bolts so.. Its slow getting there...
There is a thread around here with a spreadsheet of all the hardware listed, see if you can find it, will come in handy...
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Offline KirkBurner

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Re: from cardboard boxes to a cb750
« Reply #10 on: November 09, 2014, 02:17:42 AM »
Things slowed down abit.. and I am getting back into the groove..

I started to move into a new facility, with more people to hang out with in the garage.

I moved onto the engine... I have some rust issues with the crank bearings...

since this all came from cardboard boxes... I am missing afew parts here and there.... so one rebuild to check for all parts then .. a proper one....
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Offline dhall57

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Re: from cardboard boxes to a cb750
« Reply #11 on: November 09, 2014, 04:38:35 AM »
Now that's the true meaning of a bike in a box ;D How did you find this assortment of goodies and how did you know it was all there to make a complete bike. Must of been a super deal for you to go that route. Good luck KB and I'll been watching this thread as you progress.
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Offline 754

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Re: from cardboard boxes to a cb750
« Reply #12 on: November 09, 2014, 09:38:40 AM »
What year did they call it? I see 72 headlight ears, 71 taillight, 73 or later motor....nice combination actually.
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Kelowna B.C.       Canada

My next bike will be a ..ANFOB.....

It's All part of the ADVENTURE...

73 836cc.. Green, had it for 3 decades!!
Lost quite a few CB 750's along the way

Offline MickB

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Re: from cardboard boxes to a cb750
« Reply #13 on: November 09, 2014, 10:05:16 AM »
Go Kirk, I bought a pallet load of parts with lots missing, but it's slowly turning into a bike.
Keep at it a little each day and you'll have a bike before you know it.
The blokes here are the brains trust, any questions will be answered.
You'll know the bike inside and out.
All the best.
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Offline KirkBurner

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Re: from cardboard boxes to a cb750
« Reply #14 on: November 09, 2014, 10:39:22 AM »


The guy said he was making a k2, but then again.. I dont plan on making a period correct one as of now.

the Frame is a k2 ... new harness is a k2...  engine atleast the serial number is a 73 I think..

it was imported from Sweden to Norway in parts so.. I guss I will be missing afew.

I will be trying to update as much as possible here, cause I will have questions never done a lower end rebuild before
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Offline 70CB750

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Re: from cardboard boxes to a cb750
« Reply #15 on: November 10, 2014, 03:15:06 AM »
Subscribed.

Good luck!
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Offline KirkBurner

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Re: from cardboard boxes to a cb750
« Reply #16 on: November 13, 2014, 03:17:59 AM »
I have slowly started to inspect the parts that i have... Finding alot of rust in parts of the engine and some wear on the gears... And there seems to be missing som bearing retainers...
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Offline KirkBurner

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Re: from cardboard boxes to a cb750
« Reply #17 on: November 13, 2014, 12:52:34 PM »
Lucky me... I have been searching for weeks for one missing box with parts.... Now I may not have flesh out cash for all these parts....

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Offline KirkBurner

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Re: from cardboard boxes to a cb750
« Reply #18 on: November 23, 2014, 11:52:34 AM »
So I have been going back and forth to the shop... and it seems I have managed to find almost all the parts that I need.

I feel the need to replace the golden parts, so there will have to be some shoping.

so to do something productive I honed the cylinders,
Hopefully within this week I will have gone to the machineshop to get some plasticgauge.

and the question is.. replace the rod connector bolts or not...

And I need to figure out a way to tackle a crank rod bearing that is rusted all away...
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Offline ekpent

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Re: from cardboard boxes to a cb750
« Reply #19 on: November 24, 2014, 05:44:37 AM »
Please make sure that you have the correct size spacer washer in the tube clamp area on your upper tree so that fragile part does not crack, may be expensive to replace over there  ;)
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Offline KirkBurner

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Re: from cardboard boxes to a cb750
« Reply #20 on: November 26, 2014, 01:30:14 PM »
today was plastigauge time...

main bearings and rod bearings..

they have some ugly wear and rust and disintegration ..

the spesification on the crankshaft was ABAAA 13333

Crank
                 1            2               3             4              5
lower     d7e std  d6e std     d7e std    d6e-a std     partially disintegrated
Top       d7e std                   d7e std    d7e std       d7e std
Clearing >0,05                    0,05           >0,05

Rods
             Low      high    clearance ... comment
1     d7h    d7d std      <0,038       
2     d7j   d7h                <0,038    really worn
3     d7j   d7h              0,05       green bearing little wear marks
4     d7j   d7h              <0,038         worn



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Offline 754

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Re: from cardboard boxes to a cb750
« Reply #21 on: November 26, 2014, 04:15:22 PM »
Is the journal. As bad looking as the bearing?
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Maker of the WELDLESS 750 Frame Kit
dodogas99@gmail.com
Kelowna B.C.       Canada

My next bike will be a ..ANFOB.....

It's All part of the ADVENTURE...

73 836cc.. Green, had it for 3 decades!!
Lost quite a few CB 750's along the way

Offline KirkBurner

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Re: from cardboard boxes to a cb750
« Reply #22 on: November 26, 2014, 09:38:16 PM »
There is wear but not like the wear on the bearing... I doing this for the first time so feedback is nice
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Offline MidnightLamp

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Re: from cardboard boxes to a cb750
« Reply #23 on: November 26, 2014, 10:07:22 PM »
Get it polished at an engine machine shop, get it mic'd and check to make sure it's within the allowance in the manual. The bearing grades/tolerances are pretty tight, not much room to take out gouges. That looks like an awful lot of scoring (but it's always difficult to judge that by pic).
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Offline KirkBurner

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Re: from cardboard boxes to a cb750
« Reply #24 on: December 11, 2014, 01:15:52 PM »
So I finely got around to the workshop...

I got these pictures after I cleaned it with the degreaser, so.. some polishing needs to be done or.. its time to source something new.

or.. I could go about and move the crank from my other bike, and get a racing one from Ape or Cyclex or something..
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Offline MickB

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Re: from cardboard boxes to a cb750
« Reply #25 on: December 11, 2014, 03:44:36 PM »
Kirk good luck I know exactly what it's like as I got it all on a pallet, but by bit you'll get there.
Subscribed.
Mick


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Offline KirkBurner

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Re: from cardboard boxes to a cb750
« Reply #26 on: February 14, 2015, 11:19:05 PM »
I am a Slow MOfo....

I had the crank shipped to sweden to get the work done to like half the price I would get it for in Oslo.
Micropolished and measured....

Lucky me, it is still within specs.

so now its on to ordering bearings .. 

during the "downtime" I installed a framekit on my other cb....
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Offline KirkBurner

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Re: from cardboard boxes to a cb750
« Reply #27 on: February 14, 2015, 11:25:48 PM »
Yesterday....

so instead of hitting ebay for a small little pin...

so I made one on the lathe...


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Offline KirkBurner

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Re: from cardboard boxes to a cb750
« Reply #28 on: March 23, 2015, 09:07:13 AM »
After getting my other CB up and running (better to have one running than none running)

Slowly but surely

engine rebuild starts next week...
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