Author Topic: CB550F Main Jets  (Read 3045 times)

Offline cooleronthecoast

  • SOHC Expert
  • Posts: 307
    • View Profile
Re: CB550F Main Jets
« Reply #15 on: November 14, 2019, 05:55:53 PM »
Its all interesting stuff guys and gals, but does anyone have a single 100 main jet sitting on a shelf they can sell me so I can have 4 that match?
Now where did I put that 10mm socket?

Offline cooleronthecoast

  • SOHC Expert
  • Posts: 307
    • View Profile
Re: CB550F Main Jets
« Reply #16 on: November 15, 2019, 09:47:04 AM »
Thats great mate.  I'll have those please.  I'll pm you with my address details later today and if you have Paypal let me know your addy and I'll sort out the money too. If not just let me know how you want me to pay.
Now where did I put that 10mm socket?

Offline oldboy

  • SOHC Associate
  • Posts: 86
    • View Profile
Re: CB550F Main Jets
« Reply #17 on: November 19, 2019, 08:41:10 PM »
I've just removed 98's from my 500 carbs to fit 105's. If you drop me your address you can have them.

Offline cooleronthecoast

  • SOHC Expert
  • Posts: 307
    • View Profile
Re: CB550F Main Jets
« Reply #18 on: November 20, 2019, 03:32:00 PM »
I've just removed 98's from my 500 carbs to fit 105's. If you drop me your address you can have them.

Thanks mate, I've asked Oddjob for the ones he offered so I should be fixed up shortly.
Now where did I put that 10mm socket?

Offline oldboy

  • SOHC Associate
  • Posts: 86
    • View Profile
Re: CB550F Main Jets
« Reply #19 on: November 20, 2019, 03:59:29 PM »
Sorry they were 100's. Would not surprise me if these are 550 carbs, the more I do on this "500" the more I find wrong!!

Offline Nurse Julie

  • 1977 CB550/4 Mongrel Brat. 1974 UK 500/4 K1. Honda CD250u.
  • Grogu
  • *
  • Posts: 8206
    • View Profile
Re: CB550F Main Jets
« Reply #20 on: November 20, 2019, 04:14:21 PM »
Did we not ascertain a while back that the CB500/4 and the CB550/4 F model (non PD's which are on the 550/4 K's) are exactly the same carbs, just with different jets fitted. I know both myself and Trig have had plenty of both through our hands and have never, ever found a difference.... other than the jet sizes that were fitted by Keihin at manufacture. So, a 1971 500/4 has 627A, a 1972 CB500/4 has 627B's and a CB550/4 has 069A's fitted, which are identical carbs, all but for jetting.
« Last Edit: November 20, 2019, 04:24:21 PM by Nurse Julie »
LINK TO MY EBAY PAGE. As many of you know already, I give 10% 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 cooleronthecoast

  • SOHC Expert
  • Posts: 307
    • View Profile
Re: CB550F Main Jets
« Reply #21 on: November 20, 2019, 04:31:26 PM »
Julie, do you know why the 550F has 98 size main jets whilst the 550K has 100's?   At least thats what my Haynes manual tells me.  I was thinking because of the different exhausts but I haven't got a clue really.
Now where did I put that 10mm socket?

Offline Nurse Julie

  • 1977 CB550/4 Mongrel Brat. 1974 UK 500/4 K1. Honda CD250u.
  • Grogu
  • *
  • Posts: 8206
    • View Profile
Re: CB550F Main Jets
« Reply #22 on: November 20, 2019, 04:35:32 PM »
I know diddly squat about jetting really and can only assume it has to do with the CB550/4 K having Keihin PD carbs fitted which run very, very lean. The K3 was built primarily for the USA market and the bikes had to fit in with their strict emission regulations.
« Last Edit: November 20, 2019, 04:40:08 PM by Nurse Julie »
LINK TO MY EBAY PAGE. As many of you know already, I give 10% 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 deltarider

  • SOHC Master
  • Posts: 1337
  • My kingdom for a turkey!
    • View Profile
Re: CB550F Main Jets
« Reply #23 on: November 20, 2019, 06:24:32 PM »
Maybe you like to consult this.

Offline Nurse Julie

  • 1977 CB550/4 Mongrel Brat. 1974 UK 500/4 K1. Honda CD250u.
  • Grogu
  • *
  • Posts: 8206
    • View Profile
Re: CB550F Main Jets
« Reply #24 on: November 20, 2019, 06:47:28 PM »
I don't think that's correct, never seen or heard of a #78 main jet on any Honda, let alone a CB500/4 🤔🤔🤔🤔
LINK TO MY EBAY PAGE. As many of you know already, I give 10% 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 deltarider

  • SOHC Master
  • Posts: 1337
  • My kingdom for a turkey!
    • View Profile
Re: CB550F Main Jets
« Reply #25 on: November 20, 2019, 07:29:32 PM »
I don't think that's correct, never seen or heard of a #78 main jet on any Honda, let alone a CB500/4 🤔🤔🤔🤔
Except for France, all CB500s on continental Europe had the #78 main jets. Again, see the parts lists. Also Honda listed the #78 main jets as a possible alternative for the standard #75 on the CB400F. See the CB400F parts list, p.17 http://www.honda4fun.com/pdf_parts_list/pdf_spac400/CB400F-F1-F2/CB400F-F1-F2.pdf
« Last Edit: November 20, 2019, 07:34:48 PM by deltarider »

Offline K2-K6

  • Grogu
  • *
  • Posts: 5236
    • View Profile
Re: CB550F Main Jets
« Reply #26 on: November 20, 2019, 07:34:46 PM »
That doc,  linked above,  shows different id for needle set,  idle screw and filter to be paired with the #98 main jets.

Whether the carb set designated number changes for the whole bank setup,  and without body casting changes, is not apparent.  But I suppose it would be logical on production line and feed stock to identify the different spec externally if they where in production at the same time but destined for different markets.

Offline Nurse Julie

  • 1977 CB550/4 Mongrel Brat. 1974 UK 500/4 K1. Honda CD250u.
  • Grogu
  • *
  • Posts: 8206
    • View Profile
Re: CB550F Main Jets
« Reply #27 on: November 20, 2019, 07:49:23 PM »
I don't think that's correct, never seen or heard of a #78 main jet on any Honda, let alone a CB500/4 🤔🤔🤔🤔
Except for France, all CB500s on continental Europe had the #78 main jets. Again, see the parts lists. Also Honda listed the #78 main jets as a possible alternative for the standard #75 on the CB400F. See the CB400F parts list, p.17 http://www.honda4fun.com/pdf_parts_list/pdf_spac400/CB400F-F1-F2/CB400F-F1-F2.pdf
You're just confusing the issue Delta. It was a simple thread that has got stupidly complicated for no reason.
LINK TO MY EBAY PAGE. As many of you know already, I give 10% 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 deltarider

  • SOHC Master
  • Posts: 1337
  • My kingdom for a turkey!
    • View Profile
Re: CB550F Main Jets
« Reply #28 on: November 21, 2019, 10:03:39 AM »
I don't think that's correct, never seen or heard of a #78 main jet on any Honda, let alone a CB500/4 🤔🤔🤔🤔
Except for France, all CB500s on continental Europe had the #78 main jets. Again, see the parts lists. Also Honda listed the #78 main jets as a possible alternative for the standard #75 on the CB400F. See the CB400F parts list, p.17 http://www.honda4fun.com/pdf_parts_list/pdf_spac400/CB400F-F1-F2/CB400F-F1-F2.pdf
You're just confusing the issue Delta. It was a simple thread that has got stupidly complicated for no reason.
That's not fair, Julie. I did not start about the #78 jets that just happen to be in my overview  that was modestly attached as a PDF in reply #26. It was you yourself that opened it and then commented:
I don't think that's correct, never seen or heard of a #78 main jet on any Honda, let alone a CB500/4 🤔🤔🤔🤔.
That compelled me ofcourse to correct that again because, what is not corrected, lives on as truth eternally on the internet. Except for France, all CB500s*, no matter what year, on continental Europe had the #78 main jets and we're talking tens of thousands of bikes here, some of which may even have surfaced in the UK nowadays.
* The CB500K3 model being an exception ofcourse. That model had the PD carbs.

Offline deltarider

  • SOHC Master
  • Posts: 1337
  • My kingdom for a turkey!
    • View Profile
Re: CB550F Main Jets
« Reply #29 on: November 21, 2019, 10:32:35 AM »
...So, a 1971 500/4 has 627A, a 1972 CB500/4 has 627B's...
Does anybody know what may have been the difference between the 627A and the 627B carbs? Has anyone actually seen 627A carbs in real life?

 

SimplePortal 2.3.5 © 2008-2012, SimplePortal