r25/3 Carburator

[nasosmer]

Hello everyone.
I'm Nasos from Crete-Greece.
I own a BMW R25/3 from my grandfather.
I had some problems with my carburator Blitz from Ullis and i started to look for a BING original for my bike.
Unforunately i couldn't find a 1/24/42 brand new except a bike store from capital Athens which had a new one but for r25/2. I asked a couple of mechanics and they told me that it would be ok.
Finaly i took the decission and ordered it.
Today i took it to an old local mechanic who repairs BMW's for 50 years now.
He was very upset and told me that it wouldn't do. It would just fit on the bike but it wouldn't go well because of different style, cylinder, becks etc.
I don't know what to do yet and i don't know if the store in Athens is willing to take it back and refund me or i lost 330€...

What's your opinion?
Thanks in advance.

[nasosmer]

[Taz]

Hello Nasos.

Welcome to the forum...and congratulations, a bike with a family history...wow!

Regarding your carb problem: what type is the new one exactly? According to our table (http://monos.r25-bike.de/#vergaser_EN) there are three different options that would work well with the R25/3 engine and bike setup (especially the long intake tube through the tank, if that's still in use on your bike).

Please let us know some more details (which carb do you have now, is your bike equipped with the right tank so the intake tube is present, which diameter has the cylinder head on the carb side)...then we could give you an advice...

Best regards, Tas

[nasosmer]

Thanks for the quick reply.
The new BING that i have is 1/22/44 which was originaly for the r25/2.
I used to have the 1/24/42 which was working good but the body worn out..
the tank is ok and the tubes also.
unfortunately i don't know the cylinder diameter but i believe it's the original one.

[Taz]

Hello Nasos.

Well, the mechanic is right, that carb might do, but not very well and you machine will most probably not perform as well as it could...the guys at the dealer told you crap! Of course it's ok, bt not more than a MZ-tank for your bike or a BMW-driver's seat for your Volkswagen Golf (if you own one, that is )...given enough time and effort almost everything can be made "working", but that's not a way to do business IMHO...

I would suggest that you talk to the shop staff in a friendly way, tell them that the carb is not the right one and that you would like to return it and get your money back ... but this depends on the time since the purchase and local laws...

Best regards, Tas

[Karl]

Hello Nasosmer,

you are right - 1/22/44 is for a R25/2. It works with a R25/3, but you will have a loss of power.
Why? The inlet-diameter of the 1/22/44-carb is 22mm and thus means ist is smaller than the one for a R25/3 (1/24/42 has 24mm).
The larger the diameter ist, the more fuel reaches the combustion chamber > more power.

I´d try to find a new carb with 24mm diameter.

Regards,
Karl

[sigi_rs]

Hi Nasos,

the main problem with your new carburator is, that the /2 normally has the air filter directly at the carb inlet. The /3 has it under the fuel tank, connected with a long pipe and the rubber hose.

You have to use different nozzles to get nearly the full power (of a /2!). The different of 22 to 24 mm diameter at the air intake is a minor problem, you get a little less air flow and some turbulences.

I have the same problem with my R25/3, which will be restored in future and after a long time of thinking, I decided to search a 1/24/42 and the air filter. It's worth.

Greetings
Jörg

[nasosmer]

thanks for all the replies.
you all put some thoughts in my head...
as i told before i have a blitz carburator at the time which is a replica of the original BING but it's not exactly the same.
i have two problems.
the first is that the main body is seperated in two parts. The main and the "fuel chamber".
There is a screw to keep them tight together but it leaks sometimes gas on the motor and if you push the screw too hard....bye bye threads....
(i tell you that because it's the second time that i own a blitz carburator...) 
The second problem is how it fits on the cylinder.
There are also two different parts.
The one that has screws for the cylinder and a 3-4 cm tube to fit in the main body.
The carb set has an aluminium clamp to keep them together which if it also gets too tight it breaks.....
Then i boufht a ring with a screw to tight it but it doesn't do much.
If i get a false start, the carburator goes out and not only that. The throtle cable goes out of the slide and you have to get your tools to make it all one again...

I hope you get the picture now

[sigi_rs]

Hi Nasos,

Blitz is well-known here in germanys BMW mono community. And everybody tries to get an original one. Of course not from Blitz, but Bing.

Greetings
Jörg

[Ben Friedl]

Hi Nasos,
I wish you would have posted your problem about the carburetor before you bought the blitz or the new r25/2 carb. Your old one can be repaired, I did this with mine and it seems perfect.

http://bensbmw-r25-3.freeservers.com/Recon%20Carby.htm

Ben

[nasosmer]

Hi Ben.
The truth is that i've visited your webpage several times before and i studied what you did which is realy great. I also read that you live in Santorini so we're kind of neighbours (I live in Chania).
It seems that when i read your article about the carb i thought that it would be much more difficult to ship it to Canada and don't know what to expect and what would be the ammount of the price etc.
So that was the time i took the wrong decisions...
The other unfortunate thing is that i no longer possess the old 1/24/42 

[Ben Friedl]

Naso,Yes that's a pity
It was very easy. You must mark the package clearly, that it is for repair only and will be returned, and that's about it. It was a couple of years ago but i think it all cost me about 100Euros.
Maybe you could sell your R25/2 carb on ebay, I'm sure there would be a few people that would be interested in a NEW carburetor. If you are patient, the R25/3 carb quite often come up on ebay.

Chania, you know in all the years i have lived in Greece i have never been to Crete and as you said it is practically next door to me, maybe we can meet up one day.

Ben

[BenW]

Chania, you know in all the years i have lived in Greece i have never been to Crete and as you said it is practically next door to me, maybe we can meet up one day.

Chania is a nice place, I've been there a few years ago in the beginning of May and always wanted to come back for a bike trip all over Crete (especially the mountains). In case I'll ever get around doing so, I'll let you guys know...

Cheers,
BenW

[rolf]

Hey Nasos,
have you read your PM's?
I have sent you a PM.
Rolf

[Ben Friedl]

So would you trust the reliability of your R26 from Germany to Greece
Come past Santorini on your way and I might join you.

Ben

Chania is a nice place, I've been there a few years ago in the beginning of May and always wanted to come back for a bike trip all over Crete (especially the mountains). In case I'll ever get around doing so, I'll let you guys know...

Cheers,
BenW

[nasosmer]

Hey Nasos,
have you read your PM's?
I have sent you a PM.
Rolf

I've sent you an email Rolf....

[nasosmer]

Finally guys i think everything is ok.
I went once again to my local mechanic and he fixed some stuff.
he placed an iron ring to keep my blitz carb on the cylinder, adjusted the valves, changed oil & valvoline, fixed the throttle cable (it was long) and the bike now goes very smoothly! 
He also told me that i have to fix a ring on the top of the fork which seems to have a problem and i;m willing to do it before 2010.
As for the bing carb i called the shop in Athens that i bought it and tried to be as much friendly as i could.
the owner was very upset because he insisted that the 1/22/44 is more than ok for the r25/3 and that the mechanic who told me it's not ok is crap and told me to go to another mechanic here who knows.......
i kept telling him about the diameters and all the other things and he hung up the phone telling me if i want to return it, to go and return it!
i'm thinking of buying other stuff i need instead of getting the money back so that we're both happy. (tires, original speed meter etc.)

but thank you all for your precious advice!