actually the EASYKART 125 uses the same internal parts as the SUDAM 125, they are the early Sudam 125 engines with the electric starter added, I have 3 of them and they are tons of fun, internally they are 3 port with the same exhaust and auxiliary ports as the sudam, the timing is a little more conservative and the compression ratio is lower, the carb is also a fixed jet HL348, I have one modified with the same head shape and porting as the sudam, same carb and exhaust and is as fast as the original, plus the starter which is a great convenience.
there is also a 100cc EASYKART TAG version, it bears nothing in common with the sudam, it is based in the TT75 engine
Augusto