IMPORTANT NOT SURE WHICH MODEL IT FITS. MEASURE YOUR NEED BEFORE ORDERING
Not sure which Super 90 model this fits, but it would be a smaller displacement Honda. It came from a Kehin carb that had no markings on it. The opening on both ends of this piece measures 22mm The Air intake side of the carburetor it came from measured 28mm. Its total lenth including its thick gasket is 90mm 88mm without gasket
S90 mostly used Keihn carburetors, but some Mikuni, It is a different angle from the other S90 manifold I have (SKU 5560) I don't know which one this would be measure for yourself.
It has been suggested to me that it is from a Keihn Super 90 Honda, but no guarantees on that model fitment. You can also see the total length.u is 90mm. Please make sure that it is the part you want, no return of parts.