i have just recieved a 50cc two stroke strimmer engine from a mate of mine at the club.

i intend to convert it to turn a prop and use on a large aerobatic model.

because these engines are so heavy, is the general idea to lighten them as much as possible, only keep the necessary material for the engine to function and remove the rest?

i am currently removing the flywheel housing, it serves no purpose other than to hold the magneto, so i am leaving the mounting point for the magneto.

at the back of the engine was a threaded shaft for the recoil start, i think i should remove this shaft as it servos no purpose, i shall be hand flicking it anyways.

what is the best way of mounting these engines, at the back of the engines is 4 threaded holes where the recoil start used to be mounted, do i use these or mill them away and use a different method?

thanks everyone