Keyster Carb Kit for out of stock honda parts. Even these Keyster Kits are unavailable today. Buy it while you can. The gold standard of rebuild kits. Every part you need to make that carburetor work as it should!
They made S90's with Keihin and Mikuni carbs. The Mikuni's are rare. I have owned around 10 of them over the years, and only one was a Mikuni. So I think this kit is for a Keihin.