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#593191 - 04/02/15 6:35 pm '55 CB/DB TT racer  
Joined: Dec 2005
Posts: 527
BritTwit Online content
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BritTwit  Online Content

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Kansas City area
Another project that is now under way. I chose to put this on the Gold Star forum in hopes of getting more detailed feed back from my knowledgeable Gold Star brothers.
This is definitely not a restoration project, more of a preservation project. Details to follow.

BSA Gold Star eBay items

BSA Gold Star forum This board is dedicated to BSA Gold Star motorcycles.

#593203 - 04/02/15 7:26 pm Re: '55 CB/DB TT racer [Re: BritTwit]  
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Kansas City area
First some background:
I purchased this back in 1994 when I lived in Dallas. It was raced in SoCal originally and wound up in Texas in the early '90's. The original bill of sale stated Frame CB32.1788 and engine as CB34.GS.365. Later while cleaning, I found the engine was stamped DB34.GS.365.
Fourteen years later, I declared the bike with the GSOC. Ian Jackson, the GSOC machine registrar, sent the following:
Engine# CB34.GS.365
Frame # CB32.1788
Talley # 2665
Consignee Hap Alzina, USA
Equipment SA (Swing Arm)
Consignment note # 58835
Date Dispatched 13 December 1954
The engine test sheet with the preprinted Engine number C.B.34 G.S 365, the C was crossed out and a D hand written above it. Making it DB.34GS.365. The test sheet was for Hap Alzina and dated 28.6.55. almost six months after the dispatch date. The date stamp on the cases show 17.5.55. The first on many puzzles with this bike.
I talked with Gold Star Ron a few years ago about his Jim Hunter Goldie. His numbers and dispatch date were very close to mine (same week).
I have always felt this bike had a "Jim Hunter" connection but have so far been unable to document it. All circumstantial and hearsay. I posted a picture on the Vintage Flat Track Forum seeking information. Dave Aldana sent a reply and said he thought it was one of many bikes that Jim built. I know, I know, my bike is the one Dick Mann raced. How many times have we heard this? Another claimed "Jim Hunter" bike showed up for sale a few years ago, and it did have what appeared to be the same blue metal flake paint.
The tank is quite unusual. Sectioned and narrowed with a tube inserted inside for the throttle cable. A good friend and gold star guy in SoCal said he remembers seeing at least the tank in Jim's shop. Hey, could this be the Gold Star that James Dean bought new and sold to Marlon Brando and then wound up with Lee Marvin and was latter sold to Elvis and latter wound up with Jim Hunter??

Stay tuned for more.

#593260 - 04/03/15 4:26 am Re: '55 CB/DB TT racer [Re: BritTwit]  
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Peter R Online content
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Netherlands
Good looking machine, congrats. bigt
When you bought that bike back in 1994, the prices for a Goldie had probably not risen yet to the insane level of today.
Coming to think of it, when I bought my Goldie, back in the 1970's, I payed Hfl 750- for it , the equivalent of 350-US$.
If I only knew then what I know now..


Peter.
1974 Commando 850
1972 Trident T150T
1961 Goldie DBD34
1969 Benelli 250 sport special
#593267 - 04/03/15 7:12 am Re: '55 CB/DB TT racer [Re: BritTwit]  
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Kansas City area
We all wish for a time machine. Unfortunately for most of us, it would need to be the size of a rather large caravan.

#593324 - 04/03/15 3:37 pm Re: '55 CB/DB TT racer [Re: BritTwit]  
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Boomer Online content
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Orygone
I would concur that it looks like a Jim Hunter concoction.

Was this the other one you were referring to? This was claimed to be a Jim Hunter bike but the seller, from Southern Oregon, has a rather dubious reputation. I think Julian that is on this site from Europe ended up with it. The tank paint does look similar. Jim Hunter, as much as he hated Jap bikes, liked to use a small Honda front brake.




Bill B...


Boomer
#593623 - 04/05/15 2:23 pm Re: '55 CB/DB TT racer [Re: BritTwit]  
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Kansas City area
Plate 1 rocker Box

A lot of bench time spent on this

A useful tool? Came from a SoCal race shop. I guess for setting up valve train?

more oil flow

No valve lifter. Tapped hole on the In/Ex for better breathing?

#593821 - 04/06/15 6:08 pm Re: '55 CB/DB TT racer [Re: BritTwit]  
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Kansas City area
Plate 1 Head
Maybe this is where BSA got the idea for the DBD head


appears to have been opened up over the stock head

CB and DB valves are very close in size

Super light Webco lifters

Old racer trick

#594344 - 04/10/15 4:10 pm Re: '55 CB/DB TT racer [Re: BritTwit]  
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Kansas City area
Plate 1 Cylinder

Lots of oil holes and feathered edge on piston skirt

1/2" diameter alloy push rods

A good way to keep track of everything

#594609 - 04/12/15 11:39 am Re: '55 CB/DB TT racer [Re: BritTwit]  
Joined: Dec 2005
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Kansas City area
Plate 2 Lower end

Oval flywheels and new Alpha Bearing


Timing chest. Scrambles cams 65-2446 x 2. Webco aluminum idler gear. Drilled timing gear plate. Surprised it didn't have the needle bearing conversion.


I guess it seemed a good idea at the time. Sludge trap or a remedy for pump cavitation?



Time to breath some life back into this old war horse. Off to Jake at Halls Custom Vintage. Lots of Band-Aids to remove from this old racer.
I think this project will answer the question I've often asked myself.
Which is harder, restoration or preservation?

#594618 - 04/12/15 1:44 pm Re: '55 CB/DB TT racer [Re: BritTwit]  
Joined: Mar 2014
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Jerry Roy Online content
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Denver CO
Does anyone know what the extended intake tract does to torque curve? I would think that it lowers the RPM at which ram effect is greatest, but how does that change the shape of the curve? Do you gain enough mid range so that you don't miss the loss at the higher RPM range?
CZ


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