T500-I, or Cobra, or 500/Five

Carburettors

Most T500 people know that the MK I had 34mm 'round bowl' carburettors, but there were two types of floats used. The early style had plastic floats (13252-15010), and then at some point Suzuki switched to brass ones. I have not been able to locate a part number for the brass floats (it may have been the same number as for the plastic ones), and the MK II style brass floats are too narrow and so will not fit.
The jetting also differed for the early and late MK I, as did the float height (30mm for plastic, and 29mm for brass). The specification sheets normally only list the later settings/jetting etc.. For the early MK I's take a look at the special service bulletin for changes introduced at engine T500-14385 found here as well as the specification service bulletin #11 located at the same link. I've included a photo showing all the bits laid out.
I've included a photo of a set of MK I carburettors having brass floats. Of possible interest, the carburettor body is stamped 15011C, rather than just 15010. Whether that means anything or not I'm not sure. The 15011 carburettor body does have the later specification jetting. Just 'click' through the photo stack.
In both cases (plastic float or brass float) the MK I carburettors were mounted close to the engine and the oil injector pump cover was 'full' - Suzuki appears to have just cut a chunk out of the covers for MK II and later models having the 32mm style carburettors. The early style of injector pump cover is shown first, followed by the MK II and later style.
The plastic cover for the oil lines was dropped with the introduction of the A model, leaving the A and B models looking a bit undressed in the area of the oil injector lines.

The sequence of carburettors seems to be as follows (based on the parts manuals I have access to):

The MK I carburettor part number is shown as being either 15601 or 15602 in several of the manuals I own, but the several carburettors I have are actually stamped with 15010 (plastic float) or 15011 (brass float) leading me to doubt the 15601/15602 is correct. The earliest parts manual I have was printed in February 1968 and is specific to the MK I, but doesn't list a part number for the carburettor as a unit at all. It just lists the numbers for the carburettor components themselves.
MK II, MK III, T500R, T500J machines were stamped 15601 (per the Japan domestic manuals) or 15602 (per the general export and USA manuals) - I would like to confirm which it is so if you have one of these models, please send me a photo of the stamping.
The 15602 carburettors were superseded to 15603, 15604, and finally 15606 in the parts manuals.
T500K were stamped 15310, then 15312
T500L were stamped 15312 changing to 15313 during production
T500M, GT500A and GT500B were stamped 15313

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