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#541553 - 05/06/14 11:52 am AMAL carb - specification number chart?  
Joined: May 2014
Posts: 4
Scotian Starfire Offline
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Scotian Starfire  Offline
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Joined: May 2014
Posts: 4
NOVA SCOTIA
Hi all,

I have a July 1970 BSA Starfire 250 (US make) that has an AMAL MK1 RB 928/15 carb on it. I have just finished reading the excellent webpage that AMAL has created that explains just about everything about these carbs.



I know that the 15 part of the ID is the "specification number", but I can't find any chart telling me what 15 corresponds to.

From the AMAL Website:

Quote:
The Specification Number stamped below the three digit number identifies the jetting and the original model of bike the carburetter was fitted to, e.g. 62 below 930, read as 930/62 identifies a 30mm 900 Series carburetter for a 1971-72 BSA B50SS.


Does anyone know what bike this carb was originally made for? (i.e. what does the 15 mean?)

Last edited by Scotian Starfire; 05/06/14 11:53 am.
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#541558 - 05/06/14 12:13 pm Re: AMAL carb - specification number chart? [Re: Scotian Starfire]  
Joined: Dec 2004
Posts: 8,885
kommando Online content
kommando  Online Content


Joined: Dec 2004
Posts: 8,885
Scotland
Well they have the info somewhere as when you ask to buy a B25 Starfire carb they offer

http://amalcarb.co.uk/cf/vehicle/list/?manufacturer=B.S.A&vehicle=B25+Starfire

B.S.A B25 Starfire 247cc O.H.V. 1968 to 1970 928/8
B.S.A B25 Starfire 247cc O.H.V. 1969 onwards 928/5

So somewhere you will find the model the 15 spec version fitted, looked up the 71 B25 and that is 928/20

Rupert Ratios book may have it.

Also the US spec B25's did have variations in carb spec's from the UK versions so that may be the issue.

#541965 - 05/07/14 4:17 pm Re: AMAL carb - specification number chart? [Re: Scotian Starfire]  
Joined: Sep 2008
Posts: 131
Phil Beresford Offline
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Phil Beresford  Offline
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928/15 is listed in the AMAL records as being for a 1970 TR25W. The jetting is recorded as a 170 Main Jet, .106" Needle Jet and a 3 cutaway throttle slide. Needle position is 1. There is an earlier spec 928/9 which has the same jetting and is also listed for a TR25W. The float chamber with the drain plug was introduced in 1970 and 928/15 is one of the specifications given a new number as a result. For 1971 it became 928/20 with a 200 Main Jet and a 3 1/2 Slide for the OIF Models.

#542040 - 05/08/14 4:30 am Re: AMAL carb - specification number chart? [Re: Scotian Starfire]  
Joined: Dec 2004
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kommando Online content
kommando  Online Content


Joined: Dec 2004
Posts: 8,885
Scotland
For the TR25W AMAL give you the 928/20 currently, would love to know their thought processes as the exhaust and silencer are not the same 69/70 to 71.

#699749 - 06/27/17 2:09 am Re: AMAL carb - specification number chart? [Re: Phil Beresford]  
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Scotian Starfire Offline
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Scotian Starfire  Offline
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NOVA SCOTIA
Originally Posted by Phil Beresford
928/15 is listed in the Amal records as being for a 1970 TR25W. The jetting is recorded as a 170 Main Jet, .106" Needle Jet and a 3 cutaway throttle slide. Needle position is 1. There is an earlier spec 928/9 which has the same jetting and is also listed for a TR25W. The float chamber with the drain plug was introduced in 1970 and 928/15 is one of the specifications given a new number as a result. For 1971 it became 928/20 with a 200 Main Jet and a 3 1/2 Slide for the OIF Models.


Long time since you posted this but....

How did you find this information?

#699792 - 06/27/17 12:24 pm Re: AMAL carb - specification number chart? [Re: Scotian Starfire]  
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Irish Swede Online content
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Irish Swede  Online Content
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Elburn, Ill. USA
The "15" stamped into the carb's lozenge indicates the original motorcycle model application for which this carburetor was produced, by AMAL.
That code identifies the jetting, slide and other internals of that carburetor. Also, "TR25W" or "BSA Starfire 250"
it makes no difference, as both use the same engine, with a few external 'badge' changes.

#699921 - 06/28/17 3:28 pm Re: AMAL carb - specification number chart? [Re: Scotian Starfire]  
Joined: Aug 2001
Posts: 1,486
Al Eckstadt Online content
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Al Eckstadt  Online Content
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Posts: 1,486
Jordan, NY
"How did you find this information?"

I am not certain but I think Phil works at AMAL.

I once tried to look up the first and second applications for the 930 ( so, 930/1 and 930/2), being interested because the '67 Interceptor used /3 and /4. I was able to find that a BSA Victor Special was the first 930 application.

You can - for certain carbs - type the number in on the AMAL site and get results. Unfortunately the results for 928/15 bring up a car carburetor AUC928. Try entering just 928/.

Al


Al Eckstadt
#699937 - 06/28/17 5:40 pm Re: AMAL carb - specification number chart? [Re: Scotian Starfire]  
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AngloBike Online content
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AngloBike  Online Content
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UK Berks
http://porklips.org/~mason/moto/amal_specs.html

Bear in mind that just because a carb has a factory stamp on it doesn't mean that a super keen teenager didn't "improve" it with a mate in a shed and random parts from another carb. Check everything

Yes afaik Phil is from AMAL

#699947 - 06/28/17 6:54 pm Re: AMAL carb - specification number chart? [Re: Scotian Starfire]  
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Tridentman Online content
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Tridentman  Online Content

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New Jersey USA
Very useful list---thanks for posting it.
Is there a similar list for Concentrics?

#699950 - 06/28/17 7:04 pm Re: AMAL carb - specification number chart? [Re: Scotian Starfire]  
Joined: Jul 2012
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AngloBike Online content
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AngloBike  Online Content
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UK Berks
I have not found one....yet!


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