Yes, I was thinking bfly as well, which one? Who knows. Started looking for bfly floats and seals, but gave up and realized a pic of the carb would be better. YD

 

I have that same carburetor and it seems they're as rare as Hens teeth. Mine is on a 1981 XLH1000. I ordered a gasket kit and like yours the only thing that doesn't fit is the float gasket.

I found this thread because I was doing an image search.. This isn't the normal Keihin Butterfly. Its an early Screamin Eagle carb. Mine still holds but it's brittle so I want to change it. Its actually a great carb, and I wouldn't put a newer Venturi carb on it. I'm still looking for the gasket so if I find it, I'll try to keep you posted. I hope you had better luck

 

www.sudco.com may have parts/kits for your carb.

 

I found the gasket, oddly enough it's also a Yamaha gasket that fit a 1980-1982 Yamaha srv

I found it on Partzilla for under $9

 

Tim, Glad you found the part.