38mm Dellorto Pumper carbs

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rd400f
Posts: 17
Joined: Thu Apr 24, 2014 3:20 am

38mm Dellorto Pumper carbs

Post by rd400f »

Hi
I need suggestions on how to remove the carb insulation bushings as show as part number 4 on parts list.
Carb bushing.JPG
You can see on my carbs one is stuck in along way and one is almost out.
I want to put these in an ultrasonic cleaner so I am thinking I must remove these
plastic bushings first.
Carb bushings stuck.jpg
But how?

Also where can you get rebuild kits for these 38mm pumper Dellorto's

Thanks
Richard

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schrader7032
Posts: 7873
Joined: Fri Oct 27, 2006 3:00 am
Location: San Antonio, TX

Re: 38mm Dellorto Pumper carbs

Post by schrader7032 »

Have you tried a penetrant? Time and soaking may help somewhat.
Kurt in S.A.
'78 R100/7 '69 R69S '52 R25/2

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srankin
Posts: 351
Joined: Fri Jul 14, 2017 8:45 pm
Location: Spencerport, NY USA

Re: 38mm Dellorto Pumper carbs

Post by srankin »

As far as I can tell, Max BMW lists parts as well as Boxer two valve for rebuild. Delorto is still in business if I recall. St.
Owner of a 84, R80RT and 78, R100RS

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vechorik1373
Posts: 14
Joined: Fri Oct 27, 2006 3:00 am

Re: 38mm Dellorto Pumper carbs

Post by vechorik1373 »

Everything is available for the carbs.
This is what Bench Mark Works had in stock, on the shelf.
MAX BMW has all of my stock, you can get any of this from them.

13 11 1 260 800----gasket and O ring set Dellorto R90S This set have everything O rings, gaskets, fiber washers for one carb
13 11 1 260 848----spring accelerator pump arm Dellorto R90S
13 11 1 260 849----lever accelerator pump R90S
13 11 1 260 850----o-ring air mix screw Dellorto R90S13 11 1 260 855--$3.70--Dellorto fiber seal ring
13 11 1 260 856----screw slide stop Dellorto R90S
13 11 1 260 857----Dellorto spring slide stop R90S
13 11 1 260 858----Dellorto flat washer slide stop R90S
13 11 1 260 859----Dellorto o-ring R90S
13 11 1 260 861----Dellorto jet o-ring
13 11 1 260 863----Dellorto o-ring R90S
13 11 1 260 870---- accelerator pump diaphragm Dellorto R90S
13 11 1 260 871----pre atomizer Dellorto
13 11 1 260 873----main jet R90s
13 11 1 260 874----rubber sleeve throttle cableR90S
13 11 1 260 875----dellorto adjuster screw
13 11 1 260 876----jam nut choke cable adjuster Dellorto
13 11 1 260 877----bent cable tube Dellorto R90S
13 11 1 260 880----slide needle clip Dellorto R90S
13 11 1 260 881----throttle slide R90S
13 11 1 260 882----slide needle R90S
13 11 1 260 883---- Dellorto o-ring slide lid R90S
13 11 1 260 885----isolation sleeve Dellorto carb R90S this is what you are trying to get out, you can always get a new one
13 11 1 260 888----Dellorto filter screen R90S
13 11 1 260 889-----fuel inlet cover Dellorto R90S
13 11 1 260 890----Dellorto washer fiber inlet R90S
13 11 1 260 893----idle jet dellorto R90S no 60
13 11 1 260 894----fiber washer under float needle seat R90S
13 11 1 260 895---- float needle assembly Dellorto R90S
13 11 1 260 896---- float Dellorto R90S
13 11 1 260 898----Dellorto float bowl o-ring gasket R90S
13 11 1 260 900----washer fiber for late bowl drain plug 27 x 20 x 1 R90S Dellorto
13 11 1 260 900.A----washer fiber for early bowl drain plug 23 x 18 x 1 R90S Dellorto
13 11 1 260 901----nut float bowl new shape 20 mm diameter R90S dellorto
13 11 1 260 901A----nut float bowl old shape 18 mm diameter R90S dellorto
Vech
Technical Adviser Former owner, Bench Mark Works
662 312 2838 cell 9 am to 4pm CST PLEASE!

rd400f
Posts: 17
Joined: Thu Apr 24, 2014 3:20 am

Re: 38mm Dellorto Pumper carbs

Post by rd400f »

Hi
Thanks for the info.

I have ordered replacement sleeves and other parts.
But what about replacement float bowls?
This is from the Eurocarb site.

"There are 2 versions on the PHF/PHBE/PHM float bowl, the choice is determined by the float bowl nut.
p/n 7881 Uses nut part number 8551 & 9676 with a 14 or 17mm spanner size"

Mine are the 17mm size and Eurocarb say that they are no longer made.
Plus the p/n 10557 Uses nut part number 10238 with a 21mm spanner size , that is available, will not fit.

Suggestion as to replacements for the 1974 R90S PHM float bowl with 17mm nut ?

Thanks
Richard

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vechorik1373
Posts: 14
Joined: Fri Oct 27, 2006 3:00 am

Re: 38mm Dellorto Pumper carbs

Post by vechorik1373 »

Screenshot_2021-11-26_08-39-08.png
Screenshot_2021-11-26_08-39-08.png (31.87 KiB) Viewed 264 times
BMW never did activate a new part number for the new replacement bowl.
But they did active the larger nut and crush washer for whatever reason.
So, you would need the new larger nut crush washer, and you will have to source the bowl from Bevel Heaven, here in the USA.
You need to go here:
https://www.bevelheaven.com/stuff-for-sale-dellorto.htm
They show the new replacement bowl, their part number is dellorto 10557 Which uses, (I believe) the new larger nut and crush washer. see the photo above.
Vech
Technical Adviser Former owner, Bench Mark Works
662 312 2838 cell 9 am to 4pm CST PLEASE!

rd400f
Posts: 17
Joined: Thu Apr 24, 2014 3:20 am

Re: 38mm Dellorto Pumper carbs

Post by rd400f »

Hi
Thanks for helping with this.

What I wanted to do was swap out the old 17mm nut style bowls and nuts for the new 21mm style bowls and nuts.

Eurocarb replied..."Unfortunately there isn't an available replacement float bowl for that carburettor, my apologies.
The 10557 isn't suitable due to the difference in the float bowl nut size"

So are you saying that if I change to the 21mm nuts then the 21mm style float bowls will fit my old carb bodies?
Thanks
Richard

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vechorik1373
Posts: 14
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Re: 38mm Dellorto Pumper carbs

Post by vechorik1373 »

Richard


So are you saying that if I change to the 21mm nuts then the 21mm style float bowls will fit my old carb bodies?
Thanks

Yes, that is what I am saying...........
Vech
Technical Adviser Former owner, Bench Mark Works
662 312 2838 cell 9 am to 4pm CST PLEASE!

rd400f
Posts: 17
Joined: Thu Apr 24, 2014 3:20 am

Re: 38mm Dellorto Pumper carbs

Post by rd400f »

Hi
That is just what I need to know.
Thanks a lot for confirming that.
Richard

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