ORIGINAL: Ravivos

is it possible to reverse the rotation of a single cylinder two stroke gas engine with EI?
I know the first thing to do is to remount the hall sensor so it will be at the same angle but in a CCW insted of CW.
is there anything else to do or retiming the engine is enough ?

the engine is a 26cc gas engine, with EI.
i need it to spin CCW so i can use it as a pusher with an ordinary prop (mounting the prop backwards)

Thank you.
Raviv.