RE: JBA J15G 15CC?
There is a tread on here somewhere about the JBA15. I have 3, 2 on a TF -B-25. They run fine. The 3-D guys didn't like them. They can sag in the middle, some 3Der's recarb them for a better low-to high, high to low transition.
On my B-25, regular use (non 3D) of the trottle, they work just great.
Chris923