Have I got the right carbs for the model/year?

Bonzo

Bonzo

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My bike is a 1974 (built 09/73) 850 mk2.

The numbers on the side of my carbs are: L - 932/30 & R - 932/29.

According to this link these carbs are for/from a mk1.

Would this be right, or has there been some swapping from the previous owners?
 
Bonzo said:
The numbers on the side of my carbs are: L - 932/30 & R - 932/29.

Would this be right, or has there been some swapping from the previous owners?
Click to expand...

The Mk2/2A parts supplement lists 932/29 & /30 so they most likely are the correct carbs for an early Mk2 (but not Mk2A) as the Amal list order date for the later Mk2 932/35 & /36 carbs was 10/73.

Both pairs had the same specification (same main jet, needle jet, needle, slide, spray tube) according to the Amal list.
 
Roy Bacon’s restoration book shows ‘73 850 Mk1 and ‘74 850 Mk2 roadsters with those carb numbers originally fitted.
 
I definitely need to grab a copy of the Roy Bacon book.

Thanks for the confirmation & reassurance gents.

I love this forum.
 
If you were closer I could make you a good deal on an extra new copy of that book. Shipping from California would likely cost more than the book is worth.
 
Bonzo said:
My bike is a 1974 (built 09/73) 850 mk2.

The numbers on the side of my carbs are: L - 932/30 & R - 932/29.

According to this link these carbs are for/from a mk1.

Would this be right, or has there been some swapping from the previous owners?
Click to expand...
That list is useful, but can cause confusion. Amal essentially goes by calendar year and when they received orders from manufacturers. A "1974" Commando is not like others. Norton had no "model year" and often dates have shown up in marketing documents, part lists, or workshop manuals that add to the confusion.

For instance, Amal lists R932/42, L932/43 (PACK 114) for a 1974 MKIII. There is no evidence that Norton ever actually bought/used R932/42, L932/43 and the MKIII, although they were being built in 1974 are not considered to be 1974 bikes - again, marketing. You'll also find that Amal does not list the carbs actually used on MKIIIs.
 
L.A.B. said:
Both pairs had the same specification (same main jet, needle jet, needle, slide, spray tube) according to the Amal list.
Click to expand...
I don't have that supplement. Could you share a link so that I can get the parts numbers for these?
 
marshg246 said:
That list is useful, but can cause confusion. Amal essentially goes by calendar year and when they received orders from manufacturers. A "1974" Commando is not like others. Norton had no "model year" and often dates have shown up in marketing documents, part lists, or workshop manuals that add to the confusion.

For instance, Amal lists R932/42, L932/43 (PACK 114) for a 1974 MKIII. There is no evidence that Norton ever actually bought/used R932/42, L932/43 and the MKIII, although they were being built in 1974 are not considered to be 1974 bikes - again, marketing. You'll also find that Amal does not list the carbs actually used on MKIIIs.
Click to expand...
Confusion is right :rolleyes:
 
marshg246 said:
That list is useful, but can cause confusion. Amal essentially goes by calendar year and when they received orders from manufacturers. A "1974" Commando is not like others. Norton had no "model year" and often dates have shown up in marketing documents, part lists, or workshop manuals that add to the confusion.

For instance, Amal lists R932/42, L932/43 (PACK 114) for a 1974 MKIII. There is no evidence that Norton ever actually bought/used R932/42, L932/43 and the MKIII, although they were being built in 1974 are not considered to be 1974 bikes - again, marketing. You'll also find that Amal does not list the carbs actually used on MKIIIs.
Click to expand...
Which Amals were actually used by the factory for the MkIII?
 
Bonzo said:
I don't have that supplement. Could you share a link so that I can get the parts numbers for these?
Click to expand...

Note that the Mk2/2A supplement has no diagrams so the ones included are from the Mk1 parts book, therefore, not completely accurate for either the Mk2 or Mk2A.

Mart UK said:
Which Amals were actually used by the factory for the MkIII?
Click to expand...

932/33 & /34* (same as Mk2A).

*(/'24' in the Mk3 parts book which is obviously an error.)
 
The last table on this page: https://www.gregmarsh.com/MC/Norton/CommandoID.aspx shows the carbs by models along with details and footnotes. AFAIK, it is correct- at least no one has disputed anything in a long time. In the details, the jets are what Amal says was right originally and what they deliver today. There may be differences in what parts books say.

Keep in mind that your "1974 MK2" could have easily started life as a MK2A and is now a MK2 - except for the mufflers, my rider did before I got it.
 
marshg246 said:
Keep in mind that your "1974 MK2" could have easily started life as a MK2A and is now a MK2 - except for the mufflers, my rider did before I got it.
Click to expand...

It looks like a Mk2 probably back home from the USA.
 
marshg246 said:
The last table on this page: https://www.gregmarsh.com/MC/Norton/CommandoID.aspx shows the carbs by models along with details and footnotes. AFAIK, it is correct- at least no one has disputed anything in a long time. In the details, the jets are what Amal says was right originally and what they deliver today. There may be differences in what parts books say.

Keep in mind that your "1974 MK2" could have easily started life as a MK2A and is now a MK2 - except for the mufflers, my rider did before I got it.
Click to expand...
Thanks very much for that link.

Great info :)
 
Bonzo
I have a 74 850 which was built 12/73 but registered and sold as a 74 when it got to a showroom here in Canada. The carbs are L30 and R29 932 Amals.
Cheers,
Tom
 
Bonzo said:
My bike is a 1974 (built 09/73) 850 mk2.

The numbers on the side of my carbs are: L - 932/30 & R - 932/29.

According to this link these carbs are for/from a mk1.

Would this be right, or has there been some swapping from the previous owners?
Click to expand...

Those are the same numbers as per the originals off my 12/73 Mk2A.
 
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