Body Base Plug Screw - To Fit Type Early TT/RN Float Chamber (Stainless Steel)

This is the base plug as fitted to the bottom of floatchambers on early type (early to mid 1930's?) Amal TT Floatchambers - it may also have been fitted to other Amal model types using seperate floatchambers - see detail listing for more background.  CNC manufactured in stainless steel.  Comes with correct imperial red fibre washer.

This version is CNC manufactured using an original early TT 15 degree (i.e. 1930's Norton International) floatchamber base plug as a pattern, and includes the distinctive curved head and imperial hex the original had (and as imperial hex is now difficult to obtain - this version has milled flats from round bar).

If you are not sure if your floatchamber is originally for a 276/289 roadgoing carb, or a TT type - the 276/289 floatchamber normally had 'AMAL' cast into the floatchamber body - and were of a grey pewter alloy material, while the TT floatchambers (that I have seen) did not have any words cast in the body and were normally of alloy material - see the photograph in this listing

This particular style of base plug looks visibly identical to the type fitted to most roadgoing Amal Type 276 or 289 floatchambers - but its identifying feature is that the thread diameter on this plug screw is 7/32" - i.e. if you measure the diameter of the thread with a digital caliper, it will be somewhere around 0.205", as in the accompanying photograph.   The more common Amal 276/289 floatchamber looks the same, but the thread diameter on that floatchamber is bigger - 1/4".

I have to say - when I came to check this Amal TT base plug screw I was suprised to find it was different to the 276 type - particularly as it is a smaller bore than the 276 type, I would have expected it to be the other way round with a competition carburettor - but there were many different sub-models made over the years - i.e. TT27, TT34, TT38 (number signifying year change) - so please check your screw before ordering - if you have a larger diameter thread, then we also provide item 0847 with a 1/4" OD thread and the later TT type lipped nut with 5/16" thread - item 0846

Final point - although only a small component, these base plugs appear in a very visible position close to the timing side of most engines, and originals are nearly always corroded or chewed (they rarely need to be removed, and are normally locked up if you try to take them out).  Therefore, I have found replacing the original corroded item with this very pretty version can make a bigger cosmetic difference than would have been expected.  Final photograph is of a 1930's TT carb fitted to my 1937 Norton Inter with the screw fitted