Author Topic: Keihin 32 mm jet sizes (standard)  (Read 9646 times)

0 Members and 1 Guest are viewing this topic.

Offline Garn

  • Sr. Member
  • ****
  • Posts: 308
  • Karma: 1
    • Sydney, Australia
Keihin 32 mm jet sizes (standard)
« on: March 25, 2014, 05:04:22 AM »
I'm looking at asome carbs off a TX500A 1974, Keihin32's
Carb specs from "Servicing Yamaha Tx500A" Cycle serv Publications and  YAMAHA service manual [371-28197-10]
Note~ Neither manuals identifies these carbs as Keihin's
I am having trouble with nomenclature and size of jets.. please ref to diag (if you have one).
Main Jet size #140 ***********...... Item 7 points to this. My jet says #45
Main air jet #60....... Agree
Pilot jet #50 ............ Agree
Slow jet #50............. Agree
slow air jet #110 ...... Agree
Starter jet #$45....................this is the larger headed jet  ( main jet????).

Is there a mistake?  I take it the main jet is the larger headed jet at the bottom of the carbs in the float chamber! Definitely not #140.
I think Item 7 in the diag is main jet #45
Regardz.
Kawasaki Z1, Z1A, Z1B, Z900-A4 and TX500A
    Sydney, Australia

Offline guylr

  • Administrator
  • Hero Member
  • *****
  • Posts: 1087
  • Karma: 16
    • ATL in the USA
Re: Keihin 32 mm jet sizes (standard)
« Reply #1 on: March 25, 2014, 01:23:42 PM »
I'm looking at asome carbs off a TX500A 1974, Keihin32's
Carb specs from "Servicing Yamaha Tx500A" Cycle serv Publications and  YAMAHA service manual [371-28197-10]
Note~ Neither manuals identifies these carbs as Keihin's
I am having trouble with nomenclature and size of jets.. please ref to diag (if you have one).
Main Jet size #140 ***********...... Item 7 points to this. My jet says #45
Main air jet #60....... Agree
Pilot jet #50 ............ Agree
Slow jet #50............. Agree
slow air jet #110 ...... Agree
Starter jet #$45....................this is the larger headed jet  ( main jet????).

Is there a mistake?  I take it the main jet is the larger headed jet at the bottom of the carbs in the float chamber! Definitely not #140.
I think Item 7 in the diag is main jet #45
Regardz.

The main jet is the one with the o-ring on it that's pressed into the passage below the slide needle and needle jet tube.

Here are the US model specs for 1974

Main Jet  120 (125 in other markets)
Needle Jet 3.8mm (at outlet)
Jet Needle 302002
Pilot Jet  50 (under the rubber plug)
Starter Jet 45 (the large head jet)
Slow Air Jet 60 (under slide cover)
Main Air Jet 110 (under slide cover)
Air Screw 1 +/- 1/4 turn

The Keihin CV32 was used on all of the first three model years, 1973 through 1975. After that Mikuni BS38 were used for the 1976 and 1977 models and Mikuni BS34II for the 1978 model. The 1974 US model carbs will have the number 37162 stamped into them on the the top of the front flange. The 1975 carbs are 37164.

Guy
« Last Edit: March 25, 2014, 01:32:34 PM by guylr »
Now Retired Yamaha guy. Cut me and I bleed "Cinquasia Red"

Offline Garn

  • Sr. Member
  • ****
  • Posts: 308
  • Karma: 1
    • Sydney, Australia
Re: Keihin 32 mm jet sizes (standard)
« Reply #2 on: March 25, 2014, 08:05:36 PM »
Thanks Guy, I should have known that. How do I get them out against the pressure of the o-ring?
I even have these main jets on my "watch list". I'm going bonkers! confusing the starter jets for the main jets.



RegardZ.
« Last Edit: March 25, 2014, 08:15:47 PM by Garn »
Kawasaki Z1, Z1A, Z1B, Z900-A4 and TX500A
    Sydney, Australia

Offline guylr

  • Administrator
  • Hero Member
  • *****
  • Posts: 1087
  • Karma: 16
    • ATL in the USA
Re: Keihin 32 mm jet sizes (standard)
« Reply #3 on: March 25, 2014, 08:37:14 PM »
Thanks Guy, I should have known that. How do I get them out against the pressure of the o-ring?
I even have these main jets on my "watch list". I'm going bonkers! confusing the starter jets for the main jets.



RegardZ.

The main jet just pulls straight down out of the passage. Lightly grab and twist a little with a pair of pliers to break to o-ring tension and it will come out. The Needle Jet (nozzle) comes down and out the bottom too. Don't try to hammer it up into the body to remove it. Remove the slide and gently tap the nozzle down.

Guy
Now Retired Yamaha guy. Cut me and I bleed "Cinquasia Red"

Offline Garn

  • Sr. Member
  • ****
  • Posts: 308
  • Karma: 1
    • Sydney, Australia
Re: Keihin 32 mm jet sizes (standard)
« Reply #4 on: March 26, 2014, 04:13:02 AM »
Anyone know where I buy Keihin carb jets and that little rubber/plastic plug, that retains the bottom clip in the float bowl? I notice there are plenty of Mikuni carb parts around, but not too many Keihin.
RegardZ.
Kawasaki Z1, Z1A, Z1B, Z900-A4 and TX500A
    Sydney, Australia

Offline Garn

  • Sr. Member
  • ****
  • Posts: 308
  • Karma: 1
    • Sydney, Australia
Re: Keihin 32 mm jet sizes (standard)
« Reply #5 on: March 30, 2014, 09:47:16 PM »
Still having trouble locating carb parts jets etc for Keihin32mm
I found this...


Anyone confirm the number written on package is that lille plug, in the bottom of the carb body that supports the clip [371-14937-60]
I make this plug 371-14966-60 Cap, rubber? Has it had an update maybe?
RegardZ
Kawasaki Z1, Z1A, Z1B, Z900-A4 and TX500A
    Sydney, Australia

Offline dean

  • Global Moderator
  • Sr. Member
  • *****
  • Posts: 474
  • Karma: 8
    • Highland Park, IL
Re: Keihin 32 mm jet sizes (standard)
« Reply #6 on: March 30, 2014, 10:15:53 PM »
That's not it. That is just a little fastener hole plug 90338-09012.. look at it's applications on the various diagrams. It is not intended to seal a fuel passage:

http://www.partzilla.com/parts/detail/yamaha/YP-90338-09012-00.html


Some time back, Guy identified a carb plug that will work that is still available from Yamaha , 22V-14968-00-00 ( for VMX XVC carbs etc. ) . It is slightly longer, however can be trimmed to the 4mm spec

http://www.xs500forum.com/index.php?topic=859.msg4484#msg4484

Offline Garn

  • Sr. Member
  • ****
  • Posts: 308
  • Karma: 1
    • Sydney, Australia
Re: Keihin 32 mm jet sizes (standard)
« Reply #7 on: April 01, 2014, 09:19:06 AM »
Thanks Dean, I guess I'll have to live with that buy of the wrong parts. I'll let the forum know if I can modify them to suit.
Now, I need some main jet o-rings? .......[93210-04228] (1.1 - 4.2)
Any source. size etc.
RegardZ
« Last Edit: April 01, 2014, 09:30:09 AM by Garn »
Kawasaki Z1, Z1A, Z1B, Z900-A4 and TX500A
    Sydney, Australia

Offline johnmurphy

  • Jr. Member
  • **
  • Posts: 15
  • Karma: 1
    • Baton Rouge, Louisiana USA
Re: Keihin 32 mm jet sizes (standard)
« Reply #8 on: April 01, 2014, 02:21:59 PM »
Garn,

I can't remember which ones I used but I had bought both 1.0 x 4.5 and 1.0 x 4.0 Viton Orings for the main jets in my 32CV Keihins and whichever one I used has been sealing fine. Source is The Oring Store.
http://www.theoringstore.com/index.php?main_page=product_info&cPath=368_65_70&products_id=2973

Also, I haven't tried using the main jets offered by Jets R Us but the overall length and outside diameter matches those used in a TX500A. These apparently include an Oring.
http://www.jetsrus.com/a_jets_by_carburetor_type/jets_keihin_99202-601_main_secondary.html

Hope this is of some help.

Regards

Offline johnmurphy

  • Jr. Member
  • **
  • Posts: 15
  • Karma: 1
    • Baton Rouge, Louisiana USA
Re: Keihin 32 mm jet sizes (standard)
« Reply #9 on: April 01, 2014, 04:17:14 PM »
Garn,

I went out to the workshop and checked which main jet Orings I had used on the 32CV keihins, it was the 1.0 x 4.5 Vitons.

Regards

Offline Garn

  • Sr. Member
  • ****
  • Posts: 308
  • Karma: 1
    • Sydney, Australia
Re: Keihin 32 mm jet sizes (standard)
« Reply #10 on: April 04, 2014, 06:17:58 PM »
John, thanks for the help/ leads to these Keihin CV32 o-ring & jets.  a great help, I'm still looking and shall order soon.
At the moment, I'm waiting delivery of my "bad buy" (pictured above approx post 7) to see if I can modify them to replace the little rubbers I'm after.
RegardZ.
« Last Edit: April 04, 2014, 06:22:28 PM by Garn »
Kawasaki Z1, Z1A, Z1B, Z900-A4 and TX500A
    Sydney, Australia

Offline CrouchyUK

  • Administrator
  • Hero Member
  • *****
  • Posts: 1023
  • Karma: 19
    • Brigg, Lincolnshire, UK
Re: Keihin 32 mm jet sizes (standard)
« Reply #11 on: April 04, 2014, 06:35:45 PM »
Hi Garn- sorry I missed your post about your bungs above.

What you have found is 90338-09012 updated from part number 341-26329-00.  Fits about the whole Yamaha range including our bikes, but is just a blanking plug to fit to either master cyl or clutch lever mount in place of a mirror.  Purely cosmetic in function.

I always thought a one-winged bike looked stupid in any situation, but there you go....
1975 Honda CB200T (2) - 1975 Yamaha XS500B (2) - 1976 Yamaha XS500C
1977 Yamaha RD400D - 1977 Yamaha XS500D - 1978 Honda CB550K - 1980 Honda CB400N
1980 Honda CB900FA - 2000 Kawasaki ZX6-RG2 - 2002 Suzuki GSX-R1000K2

Offline Garn

  • Sr. Member
  • ****
  • Posts: 308
  • Karma: 1
    • Sydney, Australia
Re: Keihin 32 mm jet sizes (standard)
« Reply #12 on: April 04, 2014, 09:54:35 PM »
Thanks Crouchy. Well, those plugs are going to be handy! Might use them to keep those wasps out of carb cavities.
The cruel part is, I ordered an extra set! Lucky it's not urgent.
Perhaps, I'll pursue Guy's recommendation from Yamaha , 22V-14968-00-00 (for VMX XVC carbs etc.) via Dean.
RegardZ
Kawasaki Z1, Z1A, Z1B, Z900-A4 and TX500A
    Sydney, Australia

Offline Garn

  • Sr. Member
  • ****
  • Posts: 308
  • Karma: 1
    • Sydney, Australia
Re: Keihin 32 mm jet sizes (standard)
« Reply #13 on: April 09, 2014, 05:16:03 AM »
Crouchy, you were correct that item i ordered thinking it was a little "Top hat" for the carb CV32 was as you said.
There is no way I could modify that! That'll learn me!
RegardZ.
Kawasaki Z1, Z1A, Z1B, Z900-A4 and TX500A
    Sydney, Australia

Offline U000dsr

  • Newbie
  • *
  • Posts: 3
  • Karma: 0
Re: Keihin 32 mm jet sizes (standard)
« Reply #14 on: March 24, 2015, 02:58:59 PM »
What are the purpose of those black little plugs on the bottom of the carbs?  Is it suppose to be a snug fit because right now they just fall out from old age.