R26 Carb Query?

[guest1680]

Hi,

I have just acquired a 1957 R26, in the UK. It appears to have a dellorto carburettor [PHB maybe?] fitted (some sort of "bing" is in a box of bits). Has/does anyone else 'run' with such a carb?

Apart from 'lack of originality' assume this will not effect the operation/running of the bike.

Regards

Mark

[guest1680]

[sigi_rs]

Hi Mark,

wellcome to our board and congrats to your R26. I think nobody on this board has a dellorto carburettor at a R26. I only know that our member hannes55 has a dellorto at his R25/2 but it is fitted with a tuned engine. And Hannes told me that he needed a lot of work to get this carburettor aligned. But now the bike is running very well. 

My experience is that the original Bing type is the best for a standard engine. You need the 1/26/55 type for R26, but there are some more numbers which are mounted at earlyer R26 I don't remember.

Good luck with your R26

Joerg

[guest1680]

Hi,

I believe the Dellortto fitted is either a PHBH or PHBL. Waiting to get it home to see how it runs. As I say I believe a BING carb is supplied with the bike, and at this stage don't know why this isn't fitted - once I have seen it this may become clear.

Looking fwd to getting the single, have always had a facination for these. Had thought of the R27 - because of the rubber mounting but they seem pretty scarce in the UK, and this R26 has been restored (apart from the carb I gather) and held by a 'collector' who also has an R69 (and I believe has aquited a NIMBUS) hence needing space and letting the '57 R26 go.

Hopefully it will be running well/fine - time will tell. If the 'old' BING is not salvagable, and the Dellortto is not right are there any 'alternatives' that are available - I'd rather use the R26 than have it as a 'static' display.

Mark

[rolf.soler]

If the 'old' BING is not salvagable, and the Dellortto is not right are there any 'alternatives' that are available - I'd rather use the R26 than have it as a 'static' display.

A Bing can ALWAYS be saved  You can get every single spare part for them (in contrast to the SAWE or Amal carbs used on older BMW's) - this is why most uf us would always try to get a Bing. The biggest problem is if the threads for screws / caps are worn out, but there are people who repair this (e.g. Faak Tillmanns in Germany), or you can always find a carb case at ebay. I for instance found a complete R26 Bing carb for about 50 Euro (it goes usually higher that that). Justb post a few fotos of your Bing and we will tell you what you can do. When repairing your old Bing, make sure you exactly the spares (jets, needles, etc.) needed for your carb. Check the Bing .pdf table here (see Tipps -> Handbücher)
For R26, there are 7 different Bings that can be used without problems or necessary adaptations:
the 1/26/46 ; 1/26/52 and 1/26/55* were originally on R26
the 1/26/68* ; 1/26/79 ; 1/26/83 and 1/26/93 were originally on R27, but fit also the R26
All have a inlet diameter of 26 mm, hence the number 26 in the Type number (has nothing to do with R26, the same carbs work also on R27's)
the * (...55 and ...68) have 7 g floaters, the others 11 g floaters. But thats not very important.
There are of course ways to use other carbs, e.g. a Dellorto, but the BMW singles are very sensitive...even a wrong main jet or carb needle (in the proper carb !) can cause serious power loss...Those people driving with non standard carbs are engine freaks who spent months or years tuning their single, usually with a 350 Isetta engine, high compression piston, tuned crankshaft etc....real experts . Maybe the seller is one of those ?
However: just go and drive it. If it runs 120 km/h, the carb is just fine. A good R26 must make at least 110 km/h. If it doesn't, it's probably the wrong carb (and many other things
congratulations !
]btw: of course the R27 is nicer    but only because I have one. The R26 is just as fast; it shakes maybe a bit more, but the R27 is more sensitive and difficult to adjust

[berndsp]

Hi Mark,
There are different oppinions about the 26 and 27 in this forum, but most agree that the 27 runs a bit smother due to the rubbers, is not really faster than the 26 although it has 3 more horsepowers and can be a bit more difficult to set up right. So the 26 is not a bad choice (I say, as I have one myself
You find carbs on ebay.de, the original 1/26/55 and alternatively 1/26/111 or 112 or 1/26/123 which originally belong to the /5 or /6 twins. Those look differently due to the central float chamber, but function well. Another possible choice you find here

Good luck
BerndSP

[rolf.soler]

alternatively 1/26/111 or 112 or 1/26/123 which originally belong to the /5 or /6 twins. Those look differently due to the central float chamber, but function well

I'm not so sure about that...some do, but some owners have despaired with those carbs....same for the Blitz carb
My advice: if you have or can get one of the 7  types mentioned above, stick with it

[Taz]

Hello Mark.

welcome to our board and congrats to that new bike of yours...good decision

Regarding "which part belongs to which model": we are running a table (sort of an ongoing project) that concentrates on easy association of parts to specific models...among other things covering the carbs

Best regards, Tas

[rolf]

Hallo Bernd,
if he use a Bing of the /5 instead of the Del Orto....that's from pan into the fire...do you know somebody who knows really what he had to adjust if he use a "modern"  bing?
Rolf P(idgin)

[rolf.soler]

Oui ! (Créole) 

[rolf]

A quién?

[rolf.soler]

to all Pidgin speakers 
by the way: do you know what a tyre / Reifen is called in Pidgin ?
motofut (moto-foot)

[Taz]

Holy moly.

That's well and truly impressive...even in foreign tongues the built-in pressure to start "aloisling" latest after post 5 can not be suppressed.

What a great place to be

Best regards, Tas

[† Knut]

Hey Tassilo

what a great translation "aloisling". Sorry, but I would prefer "aloising"

In fact, the declination of "to alois" is very easy:

I alois
he / she / it alois
we alois
you alois...

....I guess that it should be an irregular verb

Knut A(lways aloising)

[Taz]

Hi Knut.

Agreed-I can live with "to alois" as well. But-if you take the forum culture into account there's one huge advantage: none of us will live long enough to ever see a requirement for a past form of that verb-as there will simply be no end to aloising around here

Best regards, Tas

[rolf]

Thank God ( Knut) for this explainment!!....every guineapig knows what he means!!
Rolf B(oeing free trade)

[† Knut]

Every guinea-pig but you!  Don't palter with me

Knut A(irbus fair trade  )

[mekgyver]

Von was redet ihr eigendlich ?

[cledrera]

Soviel ich mitbekommen habe vom Handel mit fliegenden Kleinschweinen; muss am örtlichen Schlick liegen.
Sollte man nicht rauchen.

D&W

[rolf]

nanana.... .. Tagespolitik kannst du nur Schlickrauchend ertragen....hat noch keinen geschadet...es ging um die Tankflugzeugausschreibung der Amis, bei der sich Airbus beleidigt zurückgezogen hatte, weil die Ausschreibung voll auf Boeing (ihr wisst ja-> freier Welthandel steht auf der Fahnen der Amis) zugeschnitten war /ist....es ging um ein Volumen von zig Milliarden.
Rolf r(aucht weiter!)

[cledrera]

Ah soo,
könntest Du etwas Schlick nach hier schicken?
Könnten wir auch gebrauchen.

Clemens 

[guest1680]

Incidently the Dellorto is a PHBH 26mm and the bike seems to run ok. Have posted another question to assess performance and if this is having any effect.

Only tricky thing is the flip up choke....but investigating a cable instead, seems this carb is used on various other machines (Ducati, MotoGuzzi and Lambretters etc which have a cable operated choke).

Regards

Mark

[rolf]

and Morinis!

[isie]

and Schlicks I assume ? (sort of a joke..)

[cledrera]

 
Oh great burning mud

[euro518]

Hello again from western Canada. While you're on the subject of carbs, do R26s prefer to run a bit rich or lean? How much discolouration of the header pipe is normal? Thanks.

-Kevin

P.S. Knut, your instructions on setting up the clutch play worked. I took the bike out for its first (short) run this afternoon. I found all gears and with not much work (even first). Thanks again.

[† Knut]

Mornin' Kevin,

the question of the "discolouration" of the exhaust-manifold depends mainly on the exhaust gas temperature (EGT), which is in directly linked to the air-fuel ratio (AFR) mainly during full-throttle level. Main influencing parameter of this AFR is the size of the main jet (120 for the wet air-cleaner on the R26). But even if a good mixture is installed, a discolouration will occur due to the heat of the exhaust gases. Some modern bikes have double-walled manifold to avoid the colouration but not our bikes.

To get an ideal mixture of your bike it is useful to try stepwise other main jets like 115 and 125 and watch out the max. speed at full-throttle. Surely all other parameter like ignition timing and valve clearance etc. must be OK.
After finding the ideal mixture at full-throttle you can adjust the mid-range area with the needle-jet to get a smooth transition between both ranges. I know that this is a longer adjustment but it's worth to be done and it's only necessary one time. If you got it, it's valid for this configuration for a long time.

Coming back to your initial question: I personaly prefer to adjust a bit rich at full throttle and a bit lean in the mid-range. This allows me to have most power and high cooling effect of the additional fuel with full tightend cable and more economic while crusing.

Congratulations for your first ride - probably you can send pictures from you and your bike giving us an impression of the region where you're living?!

Cheers

Knut

[euro518]

Thanks, I'll give that a try.

-Kevin

P.S. As requested, I'm attaching an image of the R26 sans rider.

[cledrera]

Kevin,

but what`s about the elks? 

Clemens

[euro518]

Very funny. I don't believe any have been spotted in Saskatoon but 2 hours north you'll find lots of them. We do see deer along the river frequently and lately the odd moose just south and east of the city. No one is quite sure why moose have moved this far south but it is a recent phenomenon. Antelope are also quite common west of Saskatoon.

-Kevin

[euro518]

One more question about my R26 carb. What setting should the dusennadel be on? I have four holes to choose from and am currently at the second from the top. Thanks.