Mine has a FPE 1.3 (21cc) and it does fine with 16/8 or 17/6 APC. I got mine NIB here on RCU for $250 new from a dealer they are a bit pricey, but it is the recommended engine from Sig. It has a super small pitts style muffler and fits completely under the cowl except for the carb and with the EI it hand starts very easy.

OR

No way you can go wrong with a G26 and I have yet to read a bad word about Brillelli.

You are a winner either way.