have hand built set of (2) mikuni TM 42 that are now a true 42 flowed them and they flow wayyyyy more than a taperbore 40 rack slide!!!! had these on my 1220 CMX motor and they work awsume I have all sizes of slides from 1.0-3.5 amd every needle and nozzle come with it ,,,,is set up with one cable for premix but Im shure if you need oil injx you could use a 44mm cable comes with 44 mll manifoldes these are the ticket for the big bore cats 900s and up I think the only thing that flowed more were a 48 crank shop carb the cutler 48 flowed the same as these ,, been saving these incase I ever built a NA mod again but ,,sign of the times!!!! 847-774-9552 Jim$400 the responce of a small carb with the flow of a big carb!!!!!!!!!!!!!!!! these also have Dial a jets on them
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