Fsheplavy,

Something seems seriously wrong. Regardless of what that Reichmuth ignition is doing (and that seems strange too...), setting up the engine from scratch with an ignition (Chinese) such as an RCExl should get good results with the standard 28-30 degs BTDC on an OS Gemini Twin.

I don't mean to question your skills, but this is worth asking. Are you using a good, large diameter accurate degree wheel when setting the sensor locations? Do you have a good, steady mounted index pointer aimed at the degree wheel? Are you verifying the sensor location statically after the initial positioning? Some sensors fire before, some in the middle, and some just as the magnet is leaving the sensor area. There's lots of variation here. Usually, one must install the sensor close to the correct angle, then verify it statically by seeing the spark occur during a slow, hand rotation. Usually, at that point, one finds a second adjustment is needed. Also, halls are sensitive to magnet N-S orientation. Usually it will fire better one of the two available orientations. You have to try both ways to determine which orientation is best. (sorry if this is starting to sound like a Dr Phil show....!)

Beyond that, I'm wondering about the technology behind the Reichmuth. With a microcontroller governed throttle curve (like in an RCEXL or a CHEXL), there seems no reason to have the extra weight and complexity of a dedicated idle hall effect sensor. The microcontroller can easily detect RPM and adjust the "advance" accordingly from just one sensor. Thus, I wonder if there even is a microcontroller in the Reichmuth. Perhaps their approach is from "way back then" and has never been updated? Either that, or they're so smart and advanced (no pun intended) that we mortals cannot perceive the design intent.