ORIGINAL: bjr_93tz
Ummm, minimum rpm to excite the sensor? They use a traditional magnet/hall sensor arrangement don't they?
Warming up your pitching arm for a speed of sound 270degree flip died out with magneto ignition.
BTW the cdi in the YS will fire at near zero rpm, it just needs to see the magnet move away from the sensor. The only "problem" with the YS arrangement is that at hand flipping speed it's probably going to spark at 20+ degrees before top dead center.
As stated in a previously, it's the firmware that was burned into the IC controling the CDI. It would be an easy change for OS to make. I guess the Hobbico guys arent going to address that for us. As far as the YS, it should be starting up at close to zero. The placement of the sensor is not always the point of fire. Some ignitions have you set them up at zero and then advances as the RPMs go up. Some ignitions have you set them up 28 degrees advanced then start up at a full retard and decrease the amount of retard as RPMs increase.