Had several flameouts with my D3R few weekends ago, i put it down to it being worn out. Pulled the plug out today and I noticed that the coil was pushed in to the body of the plug. Also it was broken in one place.
I have never had this happen before looking for some answers why this may happen. It was not over compression, the standard shims are being used. Fuel is good quality 16% nitro content.