RE: 50cc; good engines and better engines?!?!?!?
Weight, price, power, value.... only TWO out there, IMHO....Brillelli and DL
One side intake.
One rear.
Brillelli is single bolt hub.
DL is four-bolt.
Brillelli crankcase "rail mounts" to included alum. rails.
DL mounts to aluminum extrusions included.
Brillelli carb adjustments from bottom.
DL from side.
Brillelli throttle/choke arms - easily adapted to engine-box mounted servos.
DL carb needs centerline, in-fuse (or engine box) throttle. Choke lever a little tricky to servo operate.
Brillelli muffler options are good - jug is same as BME 50.
DL muffler options like DA 50 - not too bad.
Performance of each very similar.
Both are easy to start, easy to adjust, reliable and consistent to operate.