ok lets talk 26cc power. take zenoah g26pum case and add 12mm wide bearing to the front where the seal was on the marine motors which use only one bearing in front. its the same case for the plane motors which use 2-8mm bearings. machine hub 4 mm for 12mm bearing clearance and extra support. zenoah chung yang full circle stuffed crank for 26cc boats. red coil with fulley hand ported 26puh heli cylinder on .012 copper base gasket. zero drag seal in rear and boost bottle for cars. g26 marine piston with .8mm ring. walbro ported 257 carb. the outward appearance of the motor is stock except for the coil. the last on took 19hrs of sanding, grinding ,polishing but turned a 15x8 k prop at 16,400 rpm reliably. this motor was lost in crashbut working on a new one with g 270 car cylinder which has better ports and will use 29cc stroker crank. will out perform any 26 by a wide margin if you know how to do it. theres nothing more workable then a zenoah