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#538047 - 04/15/14 1:46 am Odd BB head.  
Joined: Aug 2010
Posts: 46
LightningPower Offline
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LightningPower  Offline
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Joined: Aug 2010
Posts: 46
North of 49
Has anyone else ever seen a BB34GS head, but only only equipped to have five studs instead of the usual 8? The only marking on the head is: EX D5.

Any thoughts?


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#538097 - 04/15/14 11:00 am Re: Odd BB head. [Re: LightningPower]  
Joined: Sep 2001
Posts: 2,766
Gordo in Comox Offline
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Gordo in Comox  Offline
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Posts: 2,766
Comox BC Canada
Sounds interesting for sure. Can you post a photo?

Gordo


Without frequent roadside repairs there is no fun in riding!
#538212 - 04/15/14 10:33 pm Re: Odd BB head. [Re: Gordo in Comox]  
Joined: Dec 2010
Posts: 89
Don P. Offline
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Don P.  Offline
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Joined: Dec 2010
Posts: 89
san jose,ca.
Hi,I purchased what I thought was a BB gold star head
on eBay a while back.It was as you described using only
five studs.Also on closer inspection there were other
differences such angle of carb inlet and number of fins.It had
the same lettering(EX) as you mention.I returned it and got a
refund.I really think this particular head must be from
an early B34 competiton model and not a gold star.May even
be late ZB competition.Did you get it on eBay?If so probably
same head.

#538215 - 04/15/14 10:48 pm Re: Odd BB head. [Re: LightningPower]  
Joined: Sep 2001
Posts: 2,766
Gordo in Comox Offline
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Gordo in Comox  Offline
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Joined: Sep 2001
Posts: 2,766
Comox BC Canada
LightningPower: Here are your photos. I am of the opinion that this head is some sort of B33/34 conversion to alloy to match the B33 normal four stud pattern with an extra bolt up through the barrel to pull down the head onto the part that replace the pushrod tube of the iron top end. I would love to see the barrel it used. Actually the normal barrel would work if you kept the five bolts tight. I have heard of GS folks who do not always install all the bolts.

Gordo





Without frequent roadside repairs there is no fun in riding!
#538217 - 04/15/14 11:30 pm Re: Odd BB head. [Re: Gordo in Comox]  
Joined: Aug 2010
Posts: 46
LightningPower Offline
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LightningPower  Offline
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Joined: Aug 2010
Posts: 46
North of 49
I bought the head on eBay awhile ago. I'm guessing it was the same head that you bought. I don't have another BB head to compare it to, but looking at pics of other BB heads, both GS and Comp. share the same finning and use 8 studs.

So why the five stud head? Save weight? (but add to the risk of stretching the bolts) Early attempt at making this style of head? (which is unlikely because my earlier ZB heads are all 8 stud).


ZB34GS
BB34GS
DBD34GS
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#538221 - 04/16/14 12:11 am Re: Odd BB head. [Re: LightningPower]  
Joined: Mar 2013
Posts: 291
robcurrie Online content
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robcurrie  Online Content
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Posts: 291
Irene, South Africa
Do you think "EX" could be "experimental"?

Rob C

#538225 - 04/16/14 12:38 am Re: Odd BB head. [Re: LightningPower]  
Joined: Sep 2001
Posts: 2,766
Gordo in Comox Offline
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Gordo in Comox  Offline
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Joined: Sep 2001
Posts: 2,766
Comox BC Canada
Some looks at a BB head. One fewer fin, finer fins and the plug hole maybe lower on the head in the normal BB version.

Gordo





Without frequent roadside repairs there is no fun in riding!
#538227 - 04/16/14 12:49 am Re: Odd BB head. [Re: LightningPower]  
Joined: Feb 2012
Posts: 1,210
Kerry W Offline
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Kerry W  Offline
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Joined: Feb 2012
Posts: 1,210
Middle East,
Pretty sure it's a genuine GS head - they did experiment with 4 and 5 studs. I seem to remember sing a 350 version at Phil Pearson's a while ago.


No generalisation is wholly true, not even this one.
Oliver Wendell Holmes
#538246 - 04/16/14 3:06 am Re: Odd BB head. [Re: Kerry W]  
Joined: Dec 2010
Posts: 89
Don P. Offline
BritBike Forum member
Don P.  Offline
BritBike Forum member

Joined: Dec 2010
Posts: 89
san jose,ca.
Hi,This is the same head I purchased.I had a BB gold star
head in my possession to compare it to.There were many
differences but it probably could be made to work.I
remember it was much more robust and heavier.I think
both the exhaust and the intake were angled differently
than my BB head.

#538865 - 04/19/14 1:29 pm Re: Odd BB head. [Re: Don P.]  
Joined: Aug 2010
Posts: 46
LightningPower Offline
BritBike Forum member
LightningPower  Offline
BritBike Forum member

Joined: Aug 2010
Posts: 46
North of 49
I just found a picture of a Gold Star motor with the same fins as on my head. It was on a documented 1954 350 Goldie that was built for the ISDT. Mine is 500 and not a 350, but at least the fins are the same! It can be seen on the link below "Retrorides"


Retrorides

Last edited by LightningPower; 04/19/14 1:29 pm.

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