I see that right now BEU is used as a component to créate electric motor, and the vanilla motor is not used for any other motor. may I suggest that you escalate the récipes like this:
BEU->Motor->Electric Motor
->(component for)
EBU yellow
Motor red
EMotor blue

The electric motor recipe change can be disabled through mod settings (the new recipe is actually disabled by default, so you probably enabled it explicitly).

I don't see why a engine would require a (basic) electric engine, or the other way around. Normal and electric engines just don't have a similar design.

About the color change you are right. How about:
- BEU red (old electic engine)
- EU blue
- Motor yellow (unchanged)
? It's a smaller change compared to vanilla.

Seems ok