I have worked with both the 1.20 and the 100, more 1.00s then anything though, both outstanding engines. From the factory they are set fat so you can run them and break them in. in the case of this engine today I only ran maybe 1.5 tanks of fuel through it and never touched the low end so I knew I was rich. I waited for that dead stick then did the low end without any more problems. Next time out I will lean out the high end too but it's prop selection time now so I would just be chasing the needles for no reason yet. I have broken in A lot of the 1.00s.
The 1.25 is the fattest running engine right out of the box I have ever seen but it's nothing I wasn't warned about ahead of time and it's true. There is no reason to bother setting A needle until after about three tanks of fuel, after that it takes about three more tanks to get it set enough to fly. As they get more air time you can start getting the needles set and they turn into outstanding engines. I have only worked with two of the 1.25s so far so I really can't say this is normal or not?? The fellow that warned me has broken in A lot of them so I took his word for things and it seems to be correct.
I like them both and being as I'm A YS guy that may mean something?? Or not.