Author Topic: Sprocket nuts hitting lower shock nuts after rear brake changed out  (Read 4129 times)

0 Members and 1 Guest are viewing this topic.

Offline gbal06

  • Hot Shot
  • ***
  • Posts: 289
I changed out the rear brakes and everything went back fine.  As I was spinning the wheel I heard what I thought was the brake pads against the drum, but would only happen every 1/4 turn or so.  That's when I saw this (see Pic)  any ideas why they would be hitting.  I thought I may have missed a spacer or something, but that is not the case.  Thanks

Offline 754

  • Really Old Timer ...
  • *******
  • Posts: 29,046
Re: Sprocket nuts hitting lower shock nuts after rear brake changed out
« Reply #1 on: July 21, 2017, 12:29:57 PM »
The stock shocks Dont use nuts for that reason. Try grinding back your sprocket nuts, or change the shocks.
You might be able to find a jam nut for the shock. Hope that is a spacer on the other side where the gap is.
« Last Edit: July 21, 2017, 12:33:25 PM by 754 »
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 innovativems

  • Expert
  • ****
  • Posts: 1,028
    • Innovative MotoSports
Re: Sprocket nuts hitting lower shock nuts after rear brake changed out
« Reply #2 on: July 21, 2017, 12:40:50 PM »
What shocks are you running? Those springs look really close to the chain. Was it fine before you changed the brake shoes?


Sent from my iPhone using Tapatalk
2007 KTM 990 adv
2003 Honda RC51
2000 Yamaha YSR50
1978 Honda Express
1975 Honda CB400f
1974 Honda CB350f
1974 Kawi H2
1974 Honda CB550f
1971 Kawi h1
1973 Kawi h1
1974 gt 550
1974 gt550

Offline flybox1

  • My wife thinks I'm a
  • Really Old Timer ...
  • *******
  • Posts: 14,289
Re: Sprocket nuts hitting lower shock nuts after rear brake changed out
« Reply #3 on: July 21, 2017, 12:44:12 PM »
flip the bolt around.  put it in from the chain side.
'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline PeWe

  • Really Old Timer ...
  • *******
  • Posts: 16,498
  • Bike almost back to the 70's 2015
Re: Sprocket nuts hitting lower shock nuts after rear brake changed out
« Reply #4 on: July 21, 2017, 12:53:35 PM »
Shock lower mount look too wide for the swing arm mount. Look like wrong shock for the bike in question
CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline gbal06

  • Hot Shot
  • ***
  • Posts: 289
Re: Sprocket nuts hitting lower shock nuts after rear brake changed out
« Reply #5 on: July 21, 2017, 01:16:41 PM »
that is a spacer.  My question is it was running fine until the brake job

Offline gbal06

  • Hot Shot
  • ***
  • Posts: 289
Re: Sprocket nuts hitting lower shock nuts after rear brake changed out
« Reply #6 on: July 21, 2017, 01:17:29 PM »
flip the bolt around.  put it in from the chain side.


Ya running great without a problem

Offline innovativems

  • Expert
  • ****
  • Posts: 1,028
    • Innovative MotoSports
Re: Sprocket nuts hitting lower shock nuts after rear brake changed out
« Reply #7 on: July 21, 2017, 01:20:00 PM »
I would make sure you have the right spacers on each side.  Might have them flip flopped


Sent from my iPhone using Tapatalk
2007 KTM 990 adv
2003 Honda RC51
2000 Yamaha YSR50
1978 Honda Express
1975 Honda CB400f
1974 Honda CB350f
1974 Kawi H2
1974 Honda CB550f
1971 Kawi h1
1973 Kawi h1
1974 gt 550
1974 gt550

Offline Don R

  • My Sandcast is a
  • Really Old Timer ...
  • *******
  • Posts: 21,661
  • Saver of unloved motorcycles.
Re: Sprocket nuts hitting lower shock nuts after rear brake changed out
« Reply #8 on: July 21, 2017, 01:27:04 PM »
What he said^.
No matter how many times you paint over a shadow, it's still there.
 CEO at the no kill motorcycle shop.
 You don't need a weatherman to know which way the wind blows.

Offline gbal06

  • Hot Shot
  • ***
  • Posts: 289
Re: Sprocket nuts hitting lower shock nuts after rear brake changed out
« Reply #9 on: July 21, 2017, 01:30:06 PM »
I would make sure you have the right spacers on each side.  Might have them flip flopped


Sent from my iPhone using Tapatalk

Does anyone have a pic of how the spacers should be?  There was 1 on the right side about 2-3 inches that looks like a column and I don't remember seeing one on the left

Offline innovativems

  • Expert
  • ****
  • Posts: 1,028
    • Innovative MotoSports
Re: Sprocket nuts hitting lower shock nuts after rear brake changed out
« Reply #10 on: July 21, 2017, 01:42:43 PM »
What model is your bike?  Typically the left spacer will have a line around it from the seal since it fits inside it. 


Sent from my iPhone using Tapatalk
2007 KTM 990 adv
2003 Honda RC51
2000 Yamaha YSR50
1978 Honda Express
1975 Honda CB400f
1974 Honda CB350f
1974 Kawi H2
1974 Honda CB550f
1971 Kawi h1
1973 Kawi h1
1974 gt 550
1974 gt550

Offline gbal06

  • Hot Shot
  • ***
  • Posts: 289
Re: Sprocket nuts hitting lower shock nuts after rear brake changed out
« Reply #11 on: July 21, 2017, 01:50:29 PM »
What model is your bike?  Typically the left spacer will have a line around it from the seal since it fits inside it. 


Sent from my iPhone using Tapatalk

1974 cb550

Offline gbal06

  • Hot Shot
  • ***
  • Posts: 289
Re: Sprocket nuts hitting lower shock nuts after rear brake changed out
« Reply #12 on: July 21, 2017, 01:54:42 PM »
do you have a pic of the left spacer?

Offline CycleRanger

  • No comment about being an
  • Really Old Timer ...
  • *******
  • Posts: 5,803
  • Central Texas Shop Manual Advocate
Re: Sprocket nuts hitting lower shock nuts after rear brake changed out
« Reply #13 on: July 21, 2017, 02:09:08 PM »
Do you have a copy of the shop manual?
You can get one here if you don't.
http://www.honda4fun.com/materiale-documentazione-tecnica/shop-manual
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 gbal06

  • Hot Shot
  • ***
  • Posts: 289
Re: Sprocket nuts hitting lower shock nuts after rear brake changed out
« Reply #14 on: July 21, 2017, 03:40:08 PM »
why would that change if it was working before fine and was not removed during the installation of the new rear shoes?

Offline 754

  • Really Old Timer ...
  • *******
  • Posts: 29,046
Re: Sprocket nuts hitting lower shock nuts after rear brake changed out
« Reply #15 on: July 21, 2017, 04:22:36 PM »
Something changed..we were not there  .
Did you have sprocket carrier out of the hub...one spacer in there.
Did your chain move ahead? Something  right in front of you.
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 gbal06

  • Hot Shot
  • ***
  • Posts: 289
Re: Sprocket nuts hitting lower shock nuts after rear brake changed out
« Reply #16 on: July 21, 2017, 08:30:13 PM »
I agree.  The carrier did not come off of the wheel, I made note of where the chain adjusters were and placed them back on at the same mark.The only thing I can think of is that I may have put the collar(#17 in the manual) with the smaller side going into the wheel and not having the "larger" side going towards the wheel.  Is that where the issue is?

Offline scottly

  • Global Moderator
  • Really Old Timer ...
  • *****
  • Posts: 17,616
  • Humboldt, AZ
Re: Sprocket nuts hitting lower shock nuts after rear brake changed out
« Reply #17 on: July 21, 2017, 08:54:35 PM »
Is it possible that the nuts were always hitting, but you never noticed it when riding? How many miles have been put on the bike since it was put together? The chain looks like it's never been lubed?
Don't fix it if it ain't broke!
Helmets save brains. Always wear one and ride like everyone is trying to kill you....

Offline 754

  • Really Old Timer ...
  • *******
  • Posts: 29,046
Re: Sprocket nuts hitting lower shock nuts after rear brake changed out
« Reply #18 on: July 21, 2017, 09:20:05 PM »
Is the chain new and o ring, if it is it is probably touching/grinding your cases ahead of front sprocket.
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 gbal06

  • Hot Shot
  • ***
  • Posts: 289
Re: Sprocket nuts hitting lower shock nuts after rear brake changed out
« Reply #19 on: July 22, 2017, 08:22:34 AM »
I bought the bike used and has been a daily rider w/o issue.  So its a possibilty

Offline gbal06

  • Hot Shot
  • ***
  • Posts: 289
Re: Sprocket nuts hitting lower shock nuts after rear brake changed out
« Reply #20 on: July 22, 2017, 08:23:41 AM »
Chain and o-ring are not new and have been opn the bike since I have had it.  It has about1500 miles on it

Offline innovativems

  • Expert
  • ****
  • Posts: 1,028
    • Innovative MotoSports
Re: Sprocket nuts hitting lower shock nuts after rear brake changed out
« Reply #21 on: July 22, 2017, 10:04:42 AM »
Trace your steps when you did the brakes. Something isn't correct then


Sent from my iPhone using Tapatalk
2007 KTM 990 adv
2003 Honda RC51
2000 Yamaha YSR50
1978 Honda Express
1975 Honda CB400f
1974 Honda CB350f
1974 Kawi H2
1974 Honda CB550f
1971 Kawi h1
1973 Kawi h1
1974 gt 550
1974 gt550

Offline gbal06

  • Hot Shot
  • ***
  • Posts: 289
Re: Sprocket nuts hitting lower shock nuts after rear brake changed out
« Reply #22 on: July 22, 2017, 10:42:54 AM »
I agree, I am going to take it back apart tomorrow and look at everything.  Can someone tell me which way #17 goes on?  is it the big side toward the wheel or the small size (that slides in to the wheel)  Thanks

Offline gbal06

  • Hot Shot
  • ***
  • Posts: 289
Re: Sprocket nuts hitting lower shock nuts after rear brake changed out
« Reply #23 on: July 22, 2017, 10:44:10 AM »
Also why is there two different schematics for the rear wheel?

Offline gbal06

  • Hot Shot
  • ***
  • Posts: 289
Re: Sprocket nuts hitting lower shock nuts after rear brake changed out
« Reply #24 on: July 22, 2017, 10:44:52 AM »
And this one

Offline CycleRanger

  • No comment about being an
  • Really Old Timer ...
  • *******
  • Posts: 5,803
  • Central Texas Shop Manual Advocate
Re: Sprocket nuts hitting lower shock nuts after rear brake changed out
« Reply #25 on: July 22, 2017, 10:50:00 AM »
Also why is there two different schematics for the rear wheel?

The one I posted is from the parts list. The other is from the manual.
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 gbal06

  • Hot Shot
  • ***
  • Posts: 289
Re: Sprocket nuts hitting lower shock nuts after rear brake changed out
« Reply #26 on: July 22, 2017, 10:59:51 AM »
gotcha thanks

Offline Airborne 82nd

  • Expert
  • ****
  • Posts: 828
Re: Sprocket nuts hitting lower shock nuts after rear brake changed out
« Reply #27 on: July 22, 2017, 11:49:22 AM »
I agree, I am going to take it back apart tomorrow and look at everything.  Can someone tell me which way #17 goes on?  is it the big side toward the wheel or the small size (that slides in to the wheel)  Thanks

17 is the inner tube goes inside the tire ;D

Offline 754

  • Really Old Timer ...
  • *******
  • Posts: 29,046
Re: Sprocket nuts hitting lower shock nuts after rear brake changed out
« Reply #28 on: July 22, 2017, 11:56:51 AM »
There may be 500 and 550 versions.
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 gbal06

  • Hot Shot
  • ***
  • Posts: 289
Re: Sprocket nuts hitting lower shock nuts after rear brake changed out
« Reply #29 on: July 22, 2017, 12:31:15 PM »
so for the 550k version which way should it go?  Currently the smaller side is going towards the wheel.

Offline innovativems

  • Expert
  • ****
  • Posts: 1,028
    • Innovative MotoSports
Re: Sprocket nuts hitting lower shock nuts after rear brake changed out
« Reply #30 on: July 22, 2017, 12:34:20 PM »
so for the 550k version which way should it go?  Currently the smaller side is going towards the wheel.
Like cal said


Sent from my iPhone using Tapatalk
2007 KTM 990 adv
2003 Honda RC51
2000 Yamaha YSR50
1978 Honda Express
1975 Honda CB400f
1974 Honda CB350f
1974 Kawi H2
1974 Honda CB550f
1971 Kawi h1
1973 Kawi h1
1974 gt 550
1974 gt550

Offline gbal06

  • Hot Shot
  • ***
  • Posts: 289
Re: Sprocket nuts hitting lower shock nuts after rear brake changed out
« Reply #31 on: July 22, 2017, 12:50:03 PM »
so for the 550k version which way should it go?  Currently the smaller side is going towards the wheel.
Like cal said


Sent from my iPhone using Tapatalk

ok tomorrow I will take the wheel off and switch the collar to larger toward the wheel to see if that changes the spacing

Offline gbal06

  • Hot Shot
  • ***
  • Posts: 289
Re: Sprocket nuts hitting lower shock nuts after rear brake changed out
« Reply #32 on: July 22, 2017, 02:51:08 PM »
Here is what the spacing looks like with the current collar

Offline 754

  • Really Old Timer ...
  • *******
  • Posts: 29,046
Re: Sprocket nuts hitting lower shock nuts after rear brake changed out
« Reply #33 on: July 22, 2017, 03:26:10 PM »
Is that a nylon on the shockbolt, if so remove the washer behind it.
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 gbal06

  • Hot Shot
  • ***
  • Posts: 289
Re: Sprocket nuts hitting lower shock nuts after rear brake changed out
« Reply #34 on: July 22, 2017, 03:55:45 PM »
I don't believe it is but I am at work and will take a look at it tomorrow

Offline Airborne 82nd

  • Expert
  • ****
  • Posts: 828
Re: Sprocket nuts hitting lower shock nuts after rear brake changed out
« Reply #35 on: July 23, 2017, 12:44:58 PM »
I agree, I am going to take it back apart tomorrow and look at everything.  Can someone tell me which way #17 goes on?  is it the big side toward the wheel or the small size (that slides in to the wheel)  Thanks

17 is the inner tube goes inside the tire ;D
In his first linked picture, it's the collar. Fat end towards wheel-

Don't see why or how there are two different pic for same year and model something is not correct I thought cmsl uses the manual for there site pic. I think we are looking at two different bikes or models.
cal that was my poor attempt at humor

Offline CycleRanger

  • No comment about being an
  • Really Old Timer ...
  • *******
  • Posts: 5,803
  • Central Texas Shop Manual Advocate
Re: Sprocket nuts hitting lower shock nuts after rear brake changed out
« Reply #36 on: July 23, 2017, 02:06:00 PM »
The diagrams are the same only the part numbering is different.
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 754

  • Really Old Timer ...
  • *******
  • Posts: 29,046
Re: Sprocket nuts hitting lower shock nuts after rear brake changed out
« Reply #37 on: July 23, 2017, 02:29:53 PM »
I think you mean  the part illustration numbers are different .
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