After looking at Tom`s Champion framed 750 I took another closer look at my old 750 and it has the same "Wishbone" style of frame brace in front of the swingarm as the Shell frame. No carb clearance problem there. Mine had a Shell tail section and a Champion tank. Those look like 32mm Ceriani`s. That might be a Shell decal on the tail section?? The bike had uncontrollable speed wobble.
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Did either of you race these?? Or just for street use?
Lack of a front brake seems like maybe it hit the track??