Hello
Yes it's possible to upgrade an E version en F but I think it's more interesting to use an F version.
Look at mine on 2S.
http://www.youtube.com/watch?v=FiX3d...&feature=g-all
and
http://www.youtube.com/watch?v=WPMK_..._order&list=UL
and I confirm that once thr line is primed the engine will start every time without fail.