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#419966 - 02/21/12 1:01 pm Re: Bsa B40 WD Questions [Re: Hjalte]  
Joined: Feb 2012
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Hjalte Offline
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Hjalte  Offline
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Denmark
My intake port is 27,5mm so ill go for 28mm ? with same settings ? or ?

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#419971 - 02/21/12 1:50 pm Re: Bsa B40 WD Questions [Re: Hjalte]  
Joined: Sep 2002
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Alex Offline
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Alex  Offline

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Posts: 7,812
Seattle
I don't think you'll get anything more out of the 28 mm carb. While I don't think it'll hurt anything, the WD cam and small inlet valve is just not going to allow for enough breathing to justify it. They really run well with the 626 Concentric and it's pretty easy to set up.


A smattering:
'53 Gold Flash
'67 Royal Star
'71 Rickman Metisse
'40 Silver Star
'37 Rudge Special
sixtyseventy Lightboltrocket road racer...and many more.
#419973 - 02/21/12 2:06 pm Re: Bsa B40 WD Questions [Re: Hjalte]  
Joined: Feb 2012
Posts: 60
Hjalte Offline
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Hjalte  Offline
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Posts: 60
Denmark
okay thank you

#419993 - 02/21/12 4:08 pm Re: Bsa B40 WD Questions [Re: Hjalte]  
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Peter Quick Online content
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Jaffrey, NH, USA
One could always put in a 8.75 compression piston, a Victor cam, and a B44 round barrel head that takes a bigger carb and has a bigger intake valve. All pretty easy things to do. That should give you some more pep!

Peter


check out: www.bsaunitsingles.com
2500 BSA part numbers with inventory in stock just for the unit singles!
#419997 - 02/21/12 4:25 pm Re: Bsa B40 WD Questions [Re: Hjalte]  
Joined: Sep 2002
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Alex Offline
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Alex  Offline

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Seattle
^^^True dat^^^

But then it wouldn't really be a WD anymore, would it?

BTW, this may be of interest: http://www.ebay.com/itm/NOS-BRITISH-OIL-...ies&vxp=mtr


A smattering:
'53 Gold Flash
'67 Royal Star
'71 Rickman Metisse
'40 Silver Star
'37 Rudge Special
sixtyseventy Lightboltrocket road racer...and many more.
#420148 - 02/22/12 12:04 pm Re: Bsa B40 WD Questions [Re: Alex]  
Joined: May 2004
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BSA_WM20 Offline
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BSA_WM20  Offline
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Sydney Australia
The WD B40s had a long spacer between the carb & the head . These were not needed with an alloy head but the WD still had memories of M20's boiling fuel in the carb.
Now these spacers have a hole in them to allow fuel to drain out instead of running into the pot and causing a hydraulic lock ( or worse).
To compensate for the regulated "Air Leak" the WD's were jetted very rich.
Fit a 626 and you are laughing. Put a 900 series float bowl with the drain plug in it and you will be laughing even louder.


Bike Beesa
Trevor
#420160 - 02/22/12 2:06 pm Re: Bsa B40 WD Questions [Re: Hjalte]  
Joined: Sep 2002
Posts: 7,812
Alex Offline
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Alex  Offline

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Joined: Sep 2002
Posts: 7,812
Seattle
Trevor, I don't see how this spacer could have been installed on the GB bikes as the original carb is quite long and it really couldn't be much closer to the airbox. Maybe models for other militaries were different?

Also, I think all the newer 600 and 900 carbs use the drain plug style float bowl.


A smattering:
'53 Gold Flash
'67 Royal Star
'71 Rickman Metisse
'40 Silver Star
'37 Rudge Special
sixtyseventy Lightboltrocket road racer...and many more.
#420161 - 02/22/12 2:10 pm Re: Bsa B40 WD Questions [Re: Hjalte]  
Joined: Feb 2012
Posts: 60
Hjalte Offline
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Hjalte  Offline
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Posts: 60
Denmark
i just orderd a 626 from brand new so hope it will run good, and still a 350cc bike is not one you "race" on its just for transport and style not for preformance if i wanted preformance i would have bought myself a kawazaki 9000000cc with trippel OCH or somthing hehe

#420197 - 02/22/12 5:58 pm Re: Bsa B40 WD Questions [Re: Hjalte]  
Joined: Aug 2006
Posts: 188
Pelle Offline
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Pelle  Offline
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Posts: 188
Sverige
And you will have the bike running in Alingåbro on June 1-3, perhaps? (If so, I guess it will not be the only WDB40 there...)

Pelle

#421586 - 02/29/12 11:44 am Re: Bsa B40 WD Questions [Re: Hjalte]  
Joined: Feb 2012
Posts: 60
Hjalte Offline
BritBike Forum member
Hjalte  Offline
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Joined: Feb 2012
Posts: 60
Denmark
Thanks so far guys wink

got my new carburator today from burlen, very good service and fast. Can be recomended wink



i orderd some more parts hopefully they will come in the close future , then i can sum up on the last thins i need and order them.
progress so far is going a bit slow mostly grinding down old paint, flattning it ready for painting.

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