Princess Auto aka PA here in Canada is like America's Harbor Freight, and PA has Power Fist motor @ 79cc for $150cdn at 27lbs, 3600rpm, 4.5ft/lbs which I converted to HP is 3HP. Now the 180cc is 37lbs and $170 and convert ft/lbs to HP is 6HP so double the HP and Torque. There was a good dismantling video on YT about the PA Power Fist motor. And he compared it to Honda, and the Power Fist aka PF is a Honda clone. I remember reading that the China Girl aka CG already has reductions in the motor, while the PA does not. So sprockets are needed to get proper speed. I want to go on a long distance trip with a motorized bicycle. I weight 388lbs and will be pulling a trailer with gear in it, that would probably weigh another 100 lbs I am guessing. So lets round it up to 500lbs in total for everything, bike, motor, cargo. I want to travel at a constant speed of 50kph. Terrain, well its gunna be on the Trans Canada Highway through the Rocky Mountains. What are your suggestions in motor/kit selection. I know the PA-PF I need to figure out mounting, clutch, throttle etc.