Author Topic: CB500 K2 Carb linkage flimsy flat link thing?  (Read 1307 times)

Offline TimS-Orby

  • Newbie
  • Posts: 21
    • View Profile
CB500 K2 Carb linkage flimsy flat link thing?
« on: August 11, 2025, 07:08:04 PM »
So.. CB500 K2…, this flat bar/link that joins each pair of throttle actuators and sits beneath the synchronisation locknuts (pointed at in the pic)… what’s its purpose? I can’t see that it plays any direct roll in the synchronisation of each pair of carbs, because they still adjust individually via the screws and locknuts. Does it simply hold the two brackets/actuators parallel, vertically.. and essentially, for want of a better term, stop them waggling around on those tiny ball joints?
I’m asking because despite the greatest of care in handling, whilst reassembling the carbs this afternoon one of those flat, flimsy “links” fell apart in my hand… clean down the middle.. like a carrot… and I didn’t even shout at it!
I can locate it in the parts list, but it seems that it’s part of a “set”, which would mean even if they are available they would cost a squillion quids… so I’m in the process of making a new one (Yeah, Right, Tim!), but I’d really like to know what they actually do, and how accurate my replica needs to be.
Anyone have any idea about all of that?
Any help much appreciated. And honestly, it wasn’t my fault!
T



Offline Nurse Julie

  • 1977 CB550/4 Mongrel Brat. 1974 UK 500/4 K1. Honda CD250u.
  • Grogu
  • *
  • Posts: 8586
    • View Profile
Re: CB500 K2 Carb linkage flimsy flat link thing?
« Reply #1 on: August 11, 2025, 07:14:12 PM »
They are carb sync links, they help prevent lateral and vertical movement. If you can't make any, I have a few sets available out of the 500 pairs I had made a few years back.
LINK TO MY EBAY PAGE. As many of you know already, I give discount and do post at cost to forum members if you PM me direct.
https://www.ebay.co.uk/sch/julies9731/m.html?item=165142672569&rt=nc&_trksid=p2047675.m3561.l2562

LINK TO MY CB400/4 ENGINE STRIP / ASSESSMENT AND REBUILD...NOW COMPLETE
http://www.sohc.co.uk/index.php/topic,14049.msg112691/topicseen.html#new

Offline TimS-Orby

  • Newbie
  • Posts: 21
    • View Profile
Re: CB500 K2 Carb linkage flimsy flat link thing?
« Reply #2 on: August 11, 2025, 07:28:52 PM »
Thanks, Julie. It’s great to know that I could purchase from you if my attempt fail! It turns out that I have  an equally flimsy old steel rule that’s the exact same thickness… so I’ll have a go using that as my material, and give you a shout if I mess up!
Thanks again,
T

Offline deltarider

  • SOHC Master
  • Posts: 1529
  • My kingdom for a turkey!
    • View Profile
Re: CB500 K2 Carb linkage flimsy flat link thing?
« Reply #3 on: August 12, 2025, 09:20:10 AM »
Make your own out of a feeler gauge. Nursie Julie can infrom you on the thickness.

Offline OZZYSBIKES

  • SOHC Associate
  • Posts: 67
    • View Profile
Re: CB500 K2 Carb linkage flimsy flat link thing?
« Reply #4 on: August 12, 2025, 09:52:22 AM »
Hi

To nurse Julie
If you have a set available I would like one please

Regards Jeff

Offline taysidedragon

  • SOHC Master
  • Posts: 1696
    • View Profile
Re: CB500 K2 Carb linkage flimsy flat link thing?
« Reply #5 on: August 12, 2025, 10:27:43 AM »
I made a set out of aircraft aluminium sheet. Still going strong after 6 years of use. I'm still not convinced that they need to be there.
Gareth

1977 CB400F
1965 T100SS

Offline deltarider

  • SOHC Master
  • Posts: 1529
  • My kingdom for a turkey!
    • View Profile
Re: CB500 K2 Carb linkage flimsy flat link thing?
« Reply #6 on: August 12, 2025, 12:15:23 PM »
I made a set out of aircraft aluminium sheet. Still going strong after 6 years of use. I'm still not convinced that they need to be there.
No, not really.

Offline Nurse Julie

  • 1977 CB550/4 Mongrel Brat. 1974 UK 500/4 K1. Honda CD250u.
  • Grogu
  • *
  • Posts: 8586
    • View Profile
Re: CB500 K2 Carb linkage flimsy flat link thing?
« Reply #7 on: August 12, 2025, 02:38:23 PM »
Hi

To nurse Julie
If you have a set available I would like one please

Regards Jeff
I'll PM you later Jeff.
LINK TO MY EBAY PAGE. As many of you know already, I give discount and do post at cost to forum members if you PM me direct.
https://www.ebay.co.uk/sch/julies9731/m.html?item=165142672569&rt=nc&_trksid=p2047675.m3561.l2562

LINK TO MY CB400/4 ENGINE STRIP / ASSESSMENT AND REBUILD...NOW COMPLETE
http://www.sohc.co.uk/index.php/topic,14049.msg112691/topicseen.html#new