Okay, a friend called and clued me in to the fact that Zenoah uses a soft woodruff key on their shafts. A sheared woodruff would account for the loss of power after the pop. I can't get the collar off now and will need to use a puller. If I remember correctly the collar came off pretty easily before so I think the woodruff key has sheared and got the timing off. That and the actuator for the EI is hitting the module right at TDC. I think it should hit BTDC, I'll know more tomorrow after I get the collar off the prop shaft. I'll need a wheel puller to get it off though.

Harry