testy

Author Topic: Dorothy III - CB750  (Read 47731 times)

0 Members and 1 Guest are viewing this topic.

Offline grcamna2

  • Not a
  • Really Old Timer ...
  • *******
  • Posts: 7,345
  • I love to restore & travel. Keep'em Going Strong !
Re: Dorothy III - CB750
« Reply #400 on: September 22, 2016, 04:46:14 pm »
That swingarm looks like the same one from my 1982' Suzuki GS1100E,I have a full set NOS 'in pckge.' oem swingarm bearings,sleeves and seals for that.
75' CB400F/'bunch o' parts' & 81' CB125S modded to a 'CB200S',1982' Suz. GS450TXZ
  I love the small ones too !
Do your BEST...nobody can take that away from you.

Offline calj737

  • Really Old Timer ...
  • *******
  • Posts: 19,712
  • I refuse...
Re: Dorothy III - CB750
« Reply #401 on: September 22, 2016, 04:49:03 pm »
Are you planning to shorten at the throat or along the legs?
'74 550 Build http://forums.sohc4.net/index.php?topic=126401.0
'73 500 Build http://forums.sohc4.net/index.php?topic=132935.0

*** Currently experiencing life at 60 WTFs per hour ***
I always thought getting old would take longer

Offline Retro Rocket

  • Eggs are hard due too a
  • Really Old Timer ...
  • *******
  • Posts: 19,295
  • ROCK & ROLL
Re: Dorothy III - CB750
« Reply #402 on: September 22, 2016, 05:34:48 pm »
Are you planning to shorten at the throat or along the legs?

Best done at the pivot end Cal, it won't restrict the wheel diameter  you use then... ;) I had a GSXR1100 arm shortened, I couldn't get it to the required length at the axle end, run out of room, I should have had it shortened at the pivot end for the same reason... ;)
750 K2 1000cc
750 F1 970cc
750 Bitsa 900cc
If You can't fix it with a hammer, You've got an electrical problem.

Offline calj737

  • Really Old Timer ...
  • *******
  • Posts: 19,712
  • I refuse...
Re: Dorothy III - CB750
« Reply #403 on: September 22, 2016, 07:54:51 pm »
Dunno. I'd look at shortening the leg after the bracing and before the bend to the axle. That way the leg angle remains consistent. Cutting at the pivot requires a lot more cutting, fitting and welding to my eye.
'74 550 Build http://forums.sohc4.net/index.php?topic=126401.0
'73 500 Build http://forums.sohc4.net/index.php?topic=132935.0

*** Currently experiencing life at 60 WTFs per hour ***
I always thought getting old would take longer

Offline Retro Rocket

  • Eggs are hard due too a
  • Really Old Timer ...
  • *******
  • Posts: 19,295
  • ROCK & ROLL
Re: Dorothy III - CB750
« Reply #404 on: September 22, 2016, 08:19:52 pm »
Dunno. I'd look at shortening the leg after the bracing and before the bend to the axle. That way the leg angle remains consistent. Cutting at the pivot requires a lot more cutting, fitting and welding to my eye.

Possibly, but the arm isn't the same height front to back, it gets higher all the way from the pivot to the chain adjusters, so there would be a step where its welded,  also, the pivot tube is square or flat at the back where its welded to the arm, which makes it relatively easy to reweld if the cuts are nice and square... ;)
750 K2 1000cc
750 F1 970cc
750 Bitsa 900cc
If You can't fix it with a hammer, You've got an electrical problem.

Offline 70CB750

  • Labor omnia vincit improbus.
  • Really Old Timer ...
  • *******
  • Posts: 12,623
  • Northern Virginia
Re: Dorothy III - CB750
« Reply #405 on: September 23, 2016, 09:57:28 am »
I want to make new pivot tube - fitted with bronze bushings - and weld it to the arm; shortening at the throat for sure. 

Along the legs would be easier for jigs and alignment, but as RR says, the profile is not constant.

If I oversize the pivot to say 2", I may not need to fish mouth those arms, just two positioning slots on the pivot will be enough.



Offline calj737

  • Really Old Timer ...
  • *******
  • Posts: 19,712
  • I refuse...
Re: Dorothy III - CB750
« Reply #406 on: September 23, 2016, 10:26:44 am »
I want to make new pivot tube - fitted with bronze bushings - and weld it to the arm; shortening at the throat for sure. 

Along the legs would be easier for jigs and alignment, but as RR says, the profile is not constant.

If I oversize the pivot to say 2", I may not need to fish mouth those arms, just two positioning slots on the pivot will be enough.
Dang, by that time, you're almost making a whole new swing arm... You could buy pivot tubing, box tubing, miter cut it, and transplant the axle clips over. Weld it up, brace with new plate, done.
'74 550 Build http://forums.sohc4.net/index.php?topic=126401.0
'73 500 Build http://forums.sohc4.net/index.php?topic=132935.0

*** Currently experiencing life at 60 WTFs per hour ***
I always thought getting old would take longer

Offline 70CB750

  • Labor omnia vincit improbus.
  • Really Old Timer ...
  • *******
  • Posts: 12,623
  • Northern Virginia
Re: Dorothy III - CB750
« Reply #407 on: September 23, 2016, 11:06:09 am »
You got a point  ;D

If I take it all apart, I could position legs closer together to make it fit CB750 drum wheel.  Decisions, decisions.

Offline calj737

  • Really Old Timer ...
  • *******
  • Posts: 19,712
  • I refuse...
Re: Dorothy III - CB750
« Reply #408 on: September 23, 2016, 12:35:15 pm »
Its the very reason I decided to make my own instead of modify a stop or donor arm... A wee bit of machine time, some birds mouth cuts, and fire up the welder.
'74 550 Build http://forums.sohc4.net/index.php?topic=126401.0
'73 500 Build http://forums.sohc4.net/index.php?topic=132935.0

*** Currently experiencing life at 60 WTFs per hour ***
I always thought getting old would take longer

Offline Retro Rocket

  • Eggs are hard due too a
  • Really Old Timer ...
  • *******
  • Posts: 19,295
  • ROCK & ROLL
Re: Dorothy III - CB750
« Reply #409 on: September 23, 2016, 03:55:59 pm »
You got a point  ;D

If I take it all apart, I could position legs closer together to make it fit CB750 drum wheel.  Decisions, decisions.

If you are only using stock wheels that could work, make sure you measure at the shock mounts though , they have to line up with the frameto prevent stiction, if my memory serves me well, the GS shock mounts are 5mm a side wider than the 750 arm, I think you'd still have to make custom spacers for the wheel.
750 K2 1000cc
750 F1 970cc
750 Bitsa 900cc
If You can't fix it with a hammer, You've got an electrical problem.

Offline 70CB750

  • Labor omnia vincit improbus.
  • Really Old Timer ...
  • *******
  • Posts: 12,623
  • Northern Virginia
Re: Dorothy III - CB750
« Reply #410 on: September 23, 2016, 04:09:35 pm »
You are right, I think I will make new top shock mounts, just like I made one for Red - weld them in the frame.

Offline Retro Rocket

  • Eggs are hard due too a
  • Really Old Timer ...
  • *******
  • Posts: 19,295
  • ROCK & ROLL
Re: Dorothy III - CB750
« Reply #411 on: September 23, 2016, 04:11:02 pm »
You are right, I think I will make new top shock mounts, just like I made one for Red - weld them in the frame.

Thats what I'm doing... ;)  Interested to see what you end up with here, I never considered a new pivot but now you have me thinking....
I would use the roller bearings though, there is a kit for the Honda sized pivot bolt...

https://www.z1enterprises.com/product/KL31-6923
« Last Edit: September 23, 2016, 04:14:09 pm by Retro Rocket »
750 K2 1000cc
750 F1 970cc
750 Bitsa 900cc
If You can't fix it with a hammer, You've got an electrical problem.

Offline 70CB750

  • Labor omnia vincit improbus.
  • Really Old Timer ...
  • *******
  • Posts: 12,623
  • Northern Virginia
Re: Dorothy III - CB750
« Reply #412 on: December 21, 2018, 03:35:41 am »
Yesterday I put the bottom half of Dorothy's engine on the stand and dug out the box with transmission gears. 

It is time to bring Dorothy back to life  :)
« Last Edit: December 21, 2018, 02:33:07 pm by 70CB750 »

Offline 70CB750

  • Labor omnia vincit improbus.
  • Really Old Timer ...
  • *******
  • Posts: 12,623
  • Northern Virginia
Re: Dorothy III - CB750
« Reply #413 on: December 21, 2018, 04:11:14 am »
I guess this will come handy  ;)

Offline seanbarney41

  • not really that much younger than an
  • Really Old Timer ...
  • *******
  • Posts: 8,510
Re: Dorothy III - CB750
« Reply #414 on: December 21, 2018, 06:11:57 am »
Hell yeah
If it works good, it looks good...

Offline RAF122S

  • I feel like a very very
  • Really Old Timer ...
  • *******
  • Posts: 7,153
  • SOHC4 member # 2605
Re: Dorothy III - CB750
« Reply #415 on: December 21, 2018, 11:40:15 am »
Glad to hear Dorothy will fly again ;)
David
David- back in the desert SW!

Offline 70CB750

  • Labor omnia vincit improbus.
  • Really Old Timer ...
  • *******
  • Posts: 12,623
  • Northern Virginia
Re: Dorothy III - CB750
« Reply #416 on: December 31, 2018, 04:06:27 am »
With my oldest daughter we played a bit with transmission gears.   I think i will keep all original bearings, replace gears and use the old output shaft.  Keeping it simple.

Chrysler Fiat put Magdalena  through mechanic's training and they assembled 6 speed jeep transmission - I had to show her what a real transmission looks like :)

Offline Gurp

  • I'm no.......
  • Expert
  • ****
  • Posts: 1,007
Re: Dorothy III - CB750
« Reply #417 on: February 23, 2019, 08:09:02 am »
Just re-read your thread this was one of my Favs too keep up with the first time I was on the forum in 2012.
Took a screenshot of your airbox setup as well.
Mankinds Greatest enemy has and always be itself.


slow Progress 74 cb550.

Poor boy chop 73 CB500 chop

Offline 70CB750

  • Labor omnia vincit improbus.
  • Really Old Timer ...
  • *******
  • Posts: 12,623
  • Northern Virginia
Re: Dorothy III - CB750
« Reply #418 on: February 23, 2019, 12:05:53 pm »
Just re-read your thread this was one of my Favs too keep up with the first time I was on the forum in 2012.
Took a screenshot of your airbox setup as well.

Thank you :)

 

;