RE: Welcome to Club SAITO !
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The SAI50GK93 stack fits the FA-100 and the FA-125 just fine. The only problem is that Horizon keeps running out of stock, sometimes you have to wait.
The length is the same on all the engines, it’s the ratio of length to carb bore that is different from one to another. As two examples, the FA-82 with a 0.2” bore ha the five to one ratio, while the FA-72 at 0.18” bore is 5½ to one. And of course, the FA-125 with a 0.22 bore is down to 4½ to one. These bore sizes are guesses looking in, not measured, I’ve just used them as examples. At any rate, so long as we have the 4 to 1 (or greater) ratio the stack works fine.
Bill.