Statoninc. is a very reputable company. The system he is recommending will work w/ the Robin EHO 35. IF you don't mind staying w/ the simpler friction drive and IF the BGF unit is serviceable why not simply go w/ the Huasheng or Honda 50 on your existing unit? If memory serves, the drive roller diameter on those is about 1 1/2 inches. The smaller 35 cc 4 strokes don't have the torque for that roller. If you like the Staton chain drive unit you might also look into Golden Eagle (GEBE) unit as well. I know, decisions, decisions!