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Bsa B40 WD Questions + progress on project #417893
02/10/12 1:50 pm
02/10/12 1:50 pm
Joined: Feb 2012
Posts: 60
Denmark
H
Hjalte Offline OP
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Hjalte  Offline OP
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Denmark
Hello

I have started on restoring a Bsa B40 WD
The Frame number is B40GD1125
And engine number B40GD237

I am having a hard time finding out how to get parts:
i can find alot of parts for b40 but not for the 67-68 version. only "pre 65"
i bought the "Haynes Bsa unit singles" owners workshop manual for information but i still have unanswered questions.

Is my danish military model just a remake of the b40 1965 model with lower compresion or a totaly different one ?
i have seen alot of simulareties with b44 and c15
but i am unsecure and dont want to risk getting the wrong part.

hope someone can help me with what parts i need
and will be very happy if you can link me to a website with a good selection of spare parts.

if you need more info let me know =)

hope you can help me

- Hjalte











Last edited by Hjalte; 02/16/12 7:54 pm.
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Re: Bsa B40 WD Questions [Re: Hjalte] #417894
02/10/12 2:13 pm
02/10/12 2:13 pm
Joined: Sep 2002
Posts: 7,813
Seattle
Alex Offline

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Alex  Offline

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Seattle
Hjalte,

The WD models share few parts with the earlier civilian models (Different bottom ends, different frame, wheels, etc.)...the engine is very similar to the B40G models, but has lower compression, a trials cam and a wide-ratio gearbox. There was one model that shares a lot of parts with the WD bikes, the B40 Rough Rider, which was mainly for the australian market, but these are even more difficult to find. There are military parts manuals out there, but they are difficult to follow.

Important resources for you are the Rupert Ratio Unit Singles Engine Repair Manual and Lee's WDB40 web page and when you have specific questions, there are lots of knowledgeable folks on here.

Cheers.


A smattering:
'53 Gold Flash
'67 Royal Star
'71 Rickman Metisse
'40 Silver Star
'37 Rudge Special
sixtyseventy Lightboltrocket road racer...and many more.
Re: Bsa B40 WD Questions [Re: ] #417897
02/10/12 2:38 pm
02/10/12 2:38 pm
Joined: Sep 2002
Posts: 7,813
Seattle
Alex Offline

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Seattle
Originally Posted By: 1968BSA
There are some other differences.

Better oil pump, and different mounting.
Bearing big end and I thing needle little end too.

I think the oil union underneath is different than a standard b40 motor.


Without getting into all the details (There could be an entire book written on the subject of parts compatibility in the unit singles line...oh wait Dave Smith wrote one, it's called the Rupert Ratio Unit Singles Engine Repair manual) but just address Alan
s statements to avoid confusion:

The WDB40 uses the same oil pump as the B40G models, B44's and B25's up to and including 1970. B40F (and earlier) models use a completely different pump, crankcases, covers, gearbox, Oil union, etc.

I am not aware of ANY BSA unit single using a needle bearing little end.


A smattering:
'53 Gold Flash
'67 Royal Star
'71 Rickman Metisse
'40 Silver Star
'37 Rudge Special
sixtyseventy Lightboltrocket road racer...and many more.
Re: Bsa B40 WD Questions [Re: Hjalte] #417901
02/10/12 2:55 pm
02/10/12 2:55 pm
Joined: Jul 2002
Posts: 604
England
Tom_dup1 Offline
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England
Hjalte,

These guys do a 1967 WDB40 parts list (it's at the bottom of the page):

http://www.british-motorcycle-parts.com/BSA_Motorcycle_manuals_C10_C15_B40.htm

HTH

Tom

Re: Bsa B40 WD Questions [Re: Hjalte] #417908
02/10/12 3:32 pm
02/10/12 3:32 pm
Joined: Jun 2002
Posts: 934
Jaffrey, NH, USA
Peter Quick Offline

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As Alex mentioned, check Lee Mitchell's WDB40 site: http://bsawdb40.com/ . You can buy the BSA CD (Kim the CD Man) links can be found on the main page of this site. In it there is a WDB40 parts manual and also an entire service manual in DANISH I think. Too bad I can't read it. I happen to have a 1967 Danish B40GD I'm restoring right now. Engine parts and many other parts actually are easy to find as they interchange with most other BSA unit singles. They use oil filters that were used on later B25's. If you are lacking fenders, tanks, or other model specific tinware then you'll have a much harder job hunting that stuff down. Luckily you can swap quite alot with other BSA unit singles, paint it green and it will look close enough. Feel free to ask specific questions.

Peter


check out: www.bsaunitsingles.com
2500 BSA part numbers with inventory in stock just for the unit singles!
Re: Bsa B40 WD Questions [Re: Hjalte] #417921
02/10/12 4:11 pm
02/10/12 4:11 pm
Joined: Sep 2002
Posts: 7,813
Seattle
Alex Offline

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Alex  Offline

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Seattle
Peter,

I think the B25 filters don't fit the WD filter body. They are a different length. Maybe the B25 filters were used on some WD's and not others?

Forgot about the military manual on the CD...that thing is even harder to follow than the pre-war manuals, but I guess it's better than nothin'.


A smattering:
'53 Gold Flash
'67 Royal Star
'71 Rickman Metisse
'40 Silver Star
'37 Rudge Special
sixtyseventy Lightboltrocket road racer...and many more.
Re: Bsa B40 WD Questions [Re: Hjalte] #417953
02/10/12 7:56 pm
02/10/12 7:56 pm
Joined: Feb 2012
Posts: 60
Denmark
H
Hjalte Offline OP
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Hjalte  Offline OP
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Denmark
Okay thank you guys

i orderd Rupert Ratio Unit Singles manual thing from the local libary.

The parts i need are stuff like pushrods , gasket set and other minor things.
but the things i need to be carefull with is things like oil pump.
so the engine is the same as the b44 just with shorter stroke ?
and other oil pump ofc. ?

Re: Bsa B40 WD Questions [Re: Hjalte] #418034
02/11/12 10:08 am
02/11/12 10:08 am
Joined: Feb 2012
Posts: 112
Brum, West Midlands, UK
SmoothPierre Offline
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Brum, West Midlands, UK
Hi Try this http://www.auto-cycle.co.uk/parts.htm link they have tons of spares, but they are in UK.

Re: Bsa B40 WD Questions [Re: SmoothPierre] #418039
02/11/12 11:27 am
02/11/12 11:27 am
Joined: Mar 2011
Posts: 836
derby england
wak Offline
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oil pump is the same as B44, all B40 push rods are the same,most engine stuff is the same as B44 with a mix of b40, most cycle parts come from a mix of B25/B44.


BSA lightning
BSA B50MX
TRIUMPH TR6C
BSA BUSHMAN
BSA Gold Star Daytona
BSA Gold Star Scrambler
BSA Rocket Gold Star
BSA C15S
BSA Cyclone
Triumph T120
Triumph T100 Daytona
Triumph 5TA Trials
Triumph T100 Scrambles
Cheney 560 TT
Re: Bsa B40 WD Questions [Re: Hjalte] #418045
02/11/12 12:15 pm
02/11/12 12:15 pm
Joined: Dec 2004
Posts: 9,551
Scotland
kommando Online content
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kommando  Online Content
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Scotland
Quote:
I am not aware of ANY BSA unit single using a needle bearing little end.


The B50 had a needle roller big end, when the B50 was introduced the B40 also went to a needle roller big end to simplify production, the B40 was made using the crankcases and major engine parts of the B25/B44/B50 that was being made at the time plus some B40 carry over parts such as head, barrel, pushrods etc.

I have the B40WD factory technical manual from 67 in PDF if anyone wants it, PM me with email addy

Re: Bsa B40 WD Questions [Re: Hjalte] #418286
02/12/12 9:58 pm
02/12/12 9:58 pm
Joined: Aug 2006
Posts: 193
Sverige
Pelle Offline
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Pelle  Offline
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Sverige
The Danish BSA OC sells a printed Danish army manual for the WDB40. It's much more useful (to a Scandinavian) than the confusing Haynes. You will find Rupert Ratio essential too.

Generally the Danish club can probably assist with a lot of info, as there are relatively many ex army bikes about.

The mentioned BSA DVD contains a user handbook, a parts list and the Danish manual, all for the WDB40. Get one.

Pelle

Re: Bsa B40 WD Questions [Re: Hjalte] #418775
02/15/12 6:08 am
02/15/12 6:08 am
Joined: Feb 2012
Posts: 60
Denmark
H
Hjalte Offline OP
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Denmark
i am having a hard time finding a oil filter
the external one , i can find lots of filters around the web but no housings

Re: Bsa B40 WD Questions [Re: Hjalte] #418848
02/15/12 4:40 pm
02/15/12 4:40 pm
Joined: Aug 2006
Posts: 193
Sverige
Pelle Offline
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Pelle  Offline
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The filter you have seen is probably a British Filters element, not suited for the Vokes housing fitted to most WDB40s. I think the Vokes filter element is unobtainable. So look for the later BF housing or just fit one of the many aftermarket filters.

Pelle

Re: Bsa B40 WD Questions [Re: Hjalte] #418870
02/15/12 6:08 pm
02/15/12 6:08 pm
Joined: Feb 2012
Posts: 60
Denmark
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Hjalte Offline OP
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Denmark


This is what i need

Re: Bsa B40 WD Questions [Re: Hjalte] #418878
02/15/12 6:40 pm
02/15/12 6:40 pm
Joined: Dec 2004
Posts: 9,551
Scotland
kommando Online content
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kommando  Online Content
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Scotland
That is the Vokes E37 filter, had to find and original filter elements impossible to find but a filter for a YAMAHA YZ400-F may fit, I just have to buy one to try.

Re: Bsa B40 WD Questions [Re: Hjalte] #418879
02/15/12 6:42 pm
02/15/12 6:42 pm
Joined: Sep 2002
Posts: 7,813
Seattle
Alex Offline

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Alex  Offline

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Seattle
Pelle, is this the difference between the B25 and the WDB40 filter? I always wondered what that was about since they do look very, very similar but the elements wouldn't interchange. Lee eventually found a source for the correct filters.

Hjalte, I think you will have to keep your eyes peeled on eBay and at autojumbles. Particularly the B25 ones come up from time to time and they are hard to tell from the WDB40 one.


A smattering:
'53 Gold Flash
'67 Royal Star
'71 Rickman Metisse
'40 Silver Star
'37 Rudge Special
sixtyseventy Lightboltrocket road racer...and many more.
Re: Bsa B40 WD Questions [Re: Alex] #418907
02/15/12 9:49 pm
02/15/12 9:49 pm
Joined: Aug 2006
Posts: 193
Sverige
Pelle Offline
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Pelle  Offline
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Alex, I don't know much more than that the early (Vokes) and late (BF) elements are similar but not interchangeable. I have no personal experience as I went for a Norton type spin-on filter whithout really trying to find a Vokes element. However, I'm pretty sure that all the filters sold as "WDB40/B25" must be the BF type. According to Rupert Ratio, on Lee's website, the BF type was introduced on the Mk2 WDB40.

Very nice if Lee has found a Vokes replacement.

Pelle

Re: Bsa B40 WD Questions [Re: Hjalte] #418977
02/16/12 12:06 pm
02/16/12 12:06 pm
Joined: Feb 2012
Posts: 60
Denmark
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Hjalte Offline OP
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Denmark
Well i think i will put the oil filter a side for a bit , i am going to a guy with alot of 2nd hand parts next week hopefully i will get lucky smile
Today i started on "lose" assebly to find out what parts i need, as i bought it unassembled and with quite a few parts missing but for 500 you can live with that.

I tought i would put up some pictures to show how it looks atm.




i spent alot of time polishing the inlet and exaust ports as there where lot of soot in BOTH ports! So some houers of serious valve grinding was put in it too

Before





After


Re: Bsa B40 WD Questions [Re: Hjalte] #419061
02/16/12 8:24 pm
02/16/12 8:24 pm
Joined: Aug 2006
Posts: 193
Sverige
Pelle Offline
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Pelle  Offline
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Seems to be in better shape than some bikes on the road. I'm sure it will turn out fine. Keep the pictures coming as you move along.

Pelle

Re: Bsa B40 WD Questions [Re: Hjalte] #419797
02/20/12 5:00 pm
02/20/12 5:00 pm
Joined: Feb 2012
Posts: 60
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Hjalte Offline OP
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What carburator would you recomend for my b40 ?

i thoght Monobloc but some say Concentric is better ?

Re: Bsa B40 WD Questions [Re: Hjalte] #419826
02/20/12 6:39 pm
02/20/12 6:39 pm
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Posts: 193
Sverige
Pelle Offline
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Concentric. If you keep the engine standard, 26 mm will be fine. Main jet 130, needle jet .106 and throttle cutaway 3 to start with.


Pelle

Re: Bsa B40 WD Questions [Re: Hjalte] #419831
02/20/12 7:00 pm
02/20/12 7:00 pm
Joined: Feb 2012
Posts: 60
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Hjalte Offline OP
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like this ?


Mk1 Concentric
Specification No: 626/301
Bore Size: 26mm
Engine Type: 4 stroke
Fuel Type: petrol
Location: LH
1. Lid and Adjusters -to fit 2 ajusters 622/064
2.Throttle Slide - no 3. cutaway zinc 622/0603
3. Pilot Jet - non chanceable 622/107
4. Needle Jet - 4 stoke size 106 622/122-106
5. Main Jet - size 130 376/100-130
6. Banjo - no banjo

Re: Bsa B40 WD Questions [Re: Hjalte] #419834
02/20/12 7:24 pm
02/20/12 7:24 pm
Joined: Dec 2004
Posts: 9,551
Scotland
kommando Online content
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kommando  Online Content
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Scotland
Go for a non zinc throttle slide as otherwise the carb will wear out too quickly, they do chrome plated (maybe as they did have shortages) or anodised. You only need 2 adjusters if you are fitting a choke (which I would for cold starts in winter). Plus get an extended throttle stop screw for easier starting.

Re: Bsa B40 WD Questions [Re: kommando] #419854
02/20/12 8:28 pm
02/20/12 8:28 pm
Joined: Aug 2006
Posts: 193
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Pelle Offline
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Pelle  Offline
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I guess Hjalte has visited Burlen's (AMAL) site. The specification seems about right for a WDB40. I think the carb can be ordered with a replaceable pilot jet (size 20, as a suggestion) instead of the fixed. And it comes with a choke, much needed now.

Yes, the anodised alloy throttle slide will be a wise choice. But you can use the standard slide to determine that the cutout is correct and then order the anodised one.

Pelle

Re: Bsa B40 WD Questions [Re: Pelle] #419873
02/20/12 9:43 pm
02/20/12 9:43 pm
Joined: Sep 2007
Posts: 1,127
Ottawa, Canada
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I've brought in several hard anodized slides from Burlen, and I like them a lot. Interestingly, when I asked about the plated slides, they told me that they now make only the hard anodized ones.

... Gregg


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