I bought a TM from Tom at TD Hatrick for my KLX650C 20 years ago. He sold me the same one they sold for Harley Sportsters. I think it was the 42. I guesstimated the jetting to get it running and then played around from there. Got it running nice without too much trouble. But I seem to always fluke jetting in a naive sort of way. A lot of people seem to swear by the Eidelbrock carb for the XR. I have no experience with them or with XR’s for that matter, other than reading a lot about them as I’ve always liked them but never gotten around to owning one. Although some of the asking prices are getting a bit silly now. I would probably go with GSXR’s advice as from my experience buying expensive carb’s often don’t offer much advantage over the stocker.