I'm a newb to this forum about to make my first build but I'm intrigued with these Morini engines. I've been doing some research trying to find as much info as possible. My title may be a little misleading. My question is ; what mopeds/minibikes came with the desirable,higher output version of the morini 50cc 2 stroke? I see videos on youtube and references on this site to an s5,s6 model with e or s being the low or high hp versions but when I look for a moped with a Morini most are using M1 M01 or M2 as well as a few others I'm sure I'm leaving out. Essentially, if I were to look for a good rebuildable or running engine what model morini should I be looking for? Is there a resource as to what mopeds used this model. I would just a soon buy the whole moped and pull the motor to rebuild it. thanks for looking i'm looking forward to everyone's input.