I would guess you meant converted from ATM (magnito) to Electronic Ignition... I have a new Fuji 50 EI which is factory equipped with Fuji's Electronic Ignition in place of the magnito ignition. Regarding vibration, All single cylinder 2 stroke engines have vibration somewhere within the RPM range. You can minimize this effect with a well-balanced prop. Also, use larger diameter props to keep the peak RPM down. I have had excellent results with a Three-Blade prop to minimize vibration. I you use a SPINNER, it needs to be balanced also.