Hi, Aldo. That engine has a reputation for being tricky to get running perfectly unless it is prepared very meticulously. Because of that a lot of people seem to take a dislike to them, but I'm told they are very nice indeed if you take the trouble. You can read about the whole thing in considerable detail in this thread:
https://www.outdoorking-forum.com.au/forum/ubbthreads.php?ubb=showflat&Number=49918#Post49918