Topic: 1975 cb550k with 069A carbs

[7]

I know the standard carb set up on the 1975 cb550k was the 022A but does anyone know if some came with  the 069A setup? My '75 cb550k has seemed to be stock up to this point and the engine code at least matches the year for the frame VIN. However, the carbs are stamped with 069A. Also, any advice on determining what the needle valve is? Something to measure?

[Bankerdanny]

069A is correct for the 550K though '76 and all years of the 550F. The 022A was used on the 500.

[7]

069A is correct for the 550K though '76 and all years of the 550F. The 022A was used on the 500.

Do you have a sourse for that information? I've been using the image in this post as a reference. http://forums.sohc4.net/index.php?topic=147468.0

I've seen this image around other places as well.

[Bankerdanny]

http://manuals.sohc4.net/cb500/service_manual/HSM500550_14.pdf

Page 13.

[TwoTired]

069A is correct for the 550K though '76 and all years of the 550F. The 022A was used on the 500.

No sir. The 069a refers to internal set up config and is appropriate for only the F models and their high pressure pipe.

Now, you can use carbs stamped 069a and use all internal jets a parts from an 022a carb, and it will work just fine on  K model.  But, putting carbs configured for the F on a K will make it run quite lean.


The 022a was NOT used on the 500, only the 550s   Cb500s used 627B carbs in the US.  The Honda manual misprinted the differences from a 550K to 550F.  The column marked CB500 Should be marked CB550.  That's the only way it makes sense, since the prior chapter outlines most changes from the 500 to the 550 in 74.  The F model was introduced in 1975, and therefore needed another chapter for those differences from the K model.

Cheers,

[seanbarney41]

My totally untouched original 75 550k has 022a

[Gurp]

My 73 500 came with 627B
One of my 75 550s came with 022a
The other 069a

[7]

Thanks for the clarification TT. Most the internals look to be of the 022A setup. Main jet and idle jet were sized appropriately. I don't know how to check the needle as nothing is stamped on it.

[Deltarider]

The OEM needle should either have the number 272304 (in carbs 022A, 087A)* or 273004** (the latter hardly readable) stamped in.
* carbs on: CB550K, CB550K1, CB550K2, also in carbs 627B (CB500-A) and 649A (CB500-ED, G, NL).
** in carbs 069A on: CB550F, CB550F1 and CB550F2

[Bankerdanny]

069A is correct for the 550K though '76 and all years of the 550F. The 022A was used on the 500.

No sir. The 069a refers to internal set up config and is appropriate for only the F models and their high pressure pipe.

Now, you can use carbs stamped 069a and use all internal jets a parts from an 022a carb, and it will work just fine on  K model.  But, putting carbs configured for the F on a K will make it run quite lean.


The 022a was NOT used on the 500, only the 550s   Cb500s used 627B carbs in the US.  The Honda manual misprinted the differences from a 550K to 550F.  The column marked CB500 Should be marked CB550.  That's the only way it makes sense, since the prior chapter outlines most changes from the 500 to the 550 in 74.  The F model was introduced in 1975, and therefore needed another chapter for those differences from the K model.

Cheers,

The F supplement to the Honda manual says you are wrong about the 022A on the 500 unless there is a typo.

[Deltarider]

If you refer to p. 165, that's a known typo, one of the errors in the manual. One should read 550.

[Bankerdanny]

If you refer to p. 165, that's a known typo, one of the errors in the manual. One should read 550.

Well there you go. Thanks for the clarification. I does make sense that that would be a typo. I wondered why it referenced the 500.

[7]

So it seems the consensus is that, for a cb550k, if the carbs are stamped with 069A they are likely not the originals. Although they may have been rebuilt to be to the 022A specs.

[Deltarider]

On a 'K' 069A carbs are not the original carbs. The 069A was exclusively on the 'F' models. However nobody has yet claimed that, apart from the jetting and setting, there also was a difference in the carb bodies (like venturi), so the general consensus here is the bodies are interchangeable, in other words you are safe.