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Goldstar GP carburetor question #709305
09/22/17 6:35 pm
09/22/17 6:35 pm
Joined: Sep 2017
Posts: 1
La Jolla CA
G
grand prix class Offline OP
New poster
grand prix class  Offline OP
New poster
G
Joined: Sep 2017
Posts: 1
La Jolla CA
We recently acquired a BSA goldstar fully restored by Len Haggis. It has the giant AMAL GP competition carburetor on it.
The problem I am having is as soon as the fuel taps are turned on and the float chamber fills the petrol continues to run and flows from the carburetor top.
I assumed this to be a failure of the needle and seat assembly, but upon removing the carburetor top I find that it has no such mechanism.
I am now scratching my head wondering how this unit is supposed to function, what keeps the fuel flow from running continuously?
Anyone have any information that can help me out with this?

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Re: Goldstar GP carburetor question [Re: grand prix class] #709308
09/22/17 6:58 pm
09/22/17 6:58 pm
Joined: Aug 2009
Posts: 951
gastonia .. NC
L
limeyrider Online content
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limeyrider  Online Content
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L
Joined: Aug 2009
Posts: 951
gastonia .. NC
Hi, welcome to the GS forum ....you should find inside the FLOAT chamber, on top of the float itself a VITON tipped float needle which effectively shuts off the flow of petrol, the original float needles did not have the VITON tip and leaked like a sieve .... . It has been several years since I last had a GP Carb in hand so if I am in error one of the guru's will guide us. I can't imagine that Peter ( Len Haggis ) would have omitted the needle .... but who knows ??

Good luck.

James.

Re: Goldstar GP carburetor question [Re: grand prix class] #709319
09/22/17 8:23 pm
09/22/17 8:23 pm
Joined: Aug 2001
Posts: 1,869
Elko, Nevada USA
dave - NV Offline
BritBike Forum member
dave - NV  Offline
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Joined: Aug 2001
Posts: 1,869
Elko, Nevada USA
I believe Phil Pearson in England offers a conversion of the GP float needle to a Viton float needle. I don't know the details and I've not 'yet' had a problem.


dave - NV
Re: Goldstar GP carburetor question [Re: dave - NV] #709330
09/22/17 9:05 pm
09/22/17 9:05 pm
Joined: Aug 2009
Posts: 951
gastonia .. NC
L
limeyrider Online content
BritBike Forum member
limeyrider  Online Content
BritBike Forum member
L
Joined: Aug 2009
Posts: 951
gastonia .. NC
On my last Goldie I had the big GP carb., the float chamber leaked like a sieve, I bought a VITON tipped needle direct from AMAL and that cured the leaking immediately, the original needle was machined aluminium .... metal to metal contact ... did not work or me ...or many other I suspect.
Prior to fitting the VITON tipped needle I lapped the seat with a mixture of toothpaste and silver polish to get a good seal .... worked fine.

James.

Re: Goldstar GP carburetor question [Re: grand prix class] #709707
09/26/17 10:21 am
09/26/17 10:21 am
Joined: Sep 2015
Posts: 294
Kent, England
J
John Alexander Online content
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John Alexander  Online Content
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J
Joined: Sep 2015
Posts: 294
Kent, England
By memory, if the float chamber has had a Phil Pearson conversion, then this is meant to eliminate this problem. I had this problem and sent my float chamber to Phil, he calls it a webber conversion, but can't remember if the flat bowl was retained.


Moderated by  Rich B 


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