That is true, my bike is under 60lbs, and it's 100cc, hand ported with a mildly tightened squish gap and I weigh 160lbs, I also have a stock 80cc with a 2inch PVC ram air intake that made a massive difference on mid and high range HP and RPM, cleaning the castings up and port matching the china gaskets on the bottom of your cylinder will make a huge difference as well as removing your stock muffler cap, add a 35$ carb from Amazon(2 inch intake side for the filter and 22-23mm Venturi will wake it up)