http://www.fanticmotor.it/prodotti/50_reg_comp_rac/index.php Italian Moto Passion ! the regolarita' (enduro)competizione 50cc for 09 the spec sheet reads as full on works bike,, limited edition with racing dept prepped engine, braking brakes/discs, excelrims, etc etc etc v force reed cage, cr moly perimeter chassis, al subframe, michelin enduro comp tire, dual map ignition,new ergos/plastics/graphics,24mmflat slide mikuni carb, new race pipe etc etc verlicchi built alloy swing arm, more travel in the rear suspension with a SAchs LSCD/HSCD/reb adjustable shock and 45mm TiN coated Marzocchi forks what a little gem ! they run these with 2% ratio (that's 50:1) check the other models as well, they told me that the 125 4strk comp model makes around 25hp,,,, its I believe a Yamaha sourced Minarelli built engine the 50cc are all Fantic/Minarellis
one of the Uk mags ran the 50cc one bored out to a whopping 70cc in an extreme enduro held over here called the "tough one" ..think last man standing and managed to do a full lap where over 50% of the entry didnt manage it. they must be tough!!