RE: replacement carb old OS91 Surpass
According to the Tower web site all these engines and carbs have the same needle valve body asssembly
2D, 4D, 4E, 6B, 7D, 7L, 86, FS-70S, FS-91S, FS-120S-E, FS-120S-SP, 70A 40A, 60C, 9B, 60U, 60R, 60N, 60P and 70C.
The needle valve and body are still available for these.What carb was on the OS 91 Surpass I ?
I used to have one but sold it a few years ago.