1937 aero 600 carb

[Tazmantic]

Hi all thought I’d start a new thread for the carb as getting bit frustrated with all the things I’ve found wrong  so I’ve attached a pic of the carb that was fitted not sure what the number is as I can’t really read it (I74 maybe) but it’s not the correct one it should be a 274/027 now I have a 274/027R I’m presuming I can use this as it is 25/32 and has an 80 main jet and 4/4 slide but my only issue is on the Amal settings page for the 600 it shows under special details .025 pilot outlet what does this mean? And what would the 274/027R but? And will it be ok.

Cheers

[cardan]

...it’s not the correct one it should be a 274/027...

Hi Neil,

Not sure where you found this, but I think the correct carb for 1937 is a 74/027 - see the 1937 AMAL list attached. The 274 was (I think) a 1939-on thing, where the main air inlet to the bottom of the jet was through the mouth of the carburettor, rather than the four holes drilled around the base as on the 74, as in your photo. Of course a post-war list [edit: could have] recommend a 274/027 as a replacement for a 74/027.

The extra note about the 0.025" pilot opening probably refers to the hole that runs from the bottom of the jet to the engine side of the slide (in the bottom) - sorry no idea what it was in other models.

The carb you have is probably OK - check the measurements. It looks like an unusually rough casting for an AMAL, more like the copies we had out here in Australia, made by Allparts in huge numbers.

Leon

[cardan]

The 274/027R was originally fitted to a 1950-54 250cc side valve DOT, and maybe other similar things. [edit: also 248cc ohv Panther 1946-1949...]

Leon

[Tazmantic]

Thanks Leon and that was the list I
Looked at so why I put the “2” in front starting to not see the wood for the trees I think  the one that came on the bike with the long neck has a slightly bigger bore than 25/32 but might be ok and I can only think that maybe the 0.025 was slightly larger than normal to make it richer at tickover.

Cheers Neil

[EW-Ron]

It looks like an unusually rough casting for an AMAL, more like the copies we had out here in Australia, made by Allparts in huge numbers.

Allparts cast them in brass though - from surplus artillery shells. ?

That Amal looks like its survived a bad case of corrosion !

[graeme]

Not all from bronze, I have a couple of Allparts carby bodies that look like this one