good stuff! Thx for sharing!
If I have some additional free time (currently not, due to committments to my young family), I'd definitely like to make an EFI version of B&S mower (even if it runs on a 12V gel cell for only a couple of hours w/o some form of self-charging from the motor, that's fine by me), and also add a cat con to the exhaust stream.
Q.