The carb on my .15BB schnuerle looks like the bottom one, only mine has a rectangular mounting flange at the bottom. It's a good engine, mine runs like crazy, as do my other Fox engines. I sure miss reading old Duke Fox's articles in the mags
Fox engines are good engines - if you follow proper procedure. A lot of folks try (tried) to adjust their carbs like other engines, then when they couldn't get them to run right, declared them "junk".
Yep. As a matter of fact, statements about them being "junk" are sorta what got me started with Fox engines. I was just stubborn enough to buy one just to irritate the hell out of a guy who told me they were junk. My little .15 BB is still running, iron piston and all, still runs rings around his OS .15 too.
He doesn't refer to it as junk anymore, just mutters under his breath when I flip it twice by hand and go fly.