Zenoah G290RC 29cc 4 Bolt 2 Stroke Engine /w Walbro WT-990 Carburettor (Special order)Description Introducing the Zenoah G320RC 31. 8cc 4 Bolt Engine. This all new design redesigned cylinder, crankcase, crankshaft, piston, etc for an absolute explosion of power, yet still in the same size package as the original Zenoah RC engines (G230 240 260 270 290RC). This Zenoah G320RC engine has a 38mm bore, and 28mm stroke, for 31. 8cc in its stock form. A revolutionary new cylinder design with closed deck transfer ports (two piece), with