No idea i know for sure the T90 and t125 do
here is a pic of the T500 one at least
https://www.oldjapanesebikes.com/blo...500-fuel-cock/
They were a Suzuki thing right up through the early 90's at least can't remember others having them.
although it looks like some yams had them too.
http://www.sr500forum.com/forum/view...hp?f=10&t=4977
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