Found this thread last night, pulled apart my first gen. .47 motor and found the offset hole just like all the others.

This morning I disassembled and used the nipple as a guide for the biggest drill bit I had that spun freely inside the nipple, drilled, then blew out with brake cleaner and reassembled and ran it, on the ground only so far.

Seems to have worked! Before, to ensure good running with the nose pointed up, both at 1/2 throttle and full required a overly rich mixture, both on low and high speed needles, which of course hurt power. Now, I'm only slightly rich sitting level, ( couple of clicks), and the motor will actually pick up a bit of rpm when nose up from the inherent lean out in this position, just like its supposed to.

Importantly, it only took just a few minutes of fiddling to get it running right, where in the past it was much more difficult to get right.

Throttle response is improved as well, importantly as this is installed in a tufflight 4d. It'll be nice to actually try some hovering without worrying about lack of power or a flame out.

I'll report back after a test flight.


Dean in Milwaukee