Here we have a Kymco 50cc 4 stroke scooter. This is a video on installing the power up kit. Power up kit is a typical 139QMB big bore kit. Once finished, this 4 stroke will run with the stock 2 stroke scooters. This Kymco went from a top speed of 32 mph to 42 mph at 6000 feet of altitude. Also.. Torque was way up. Jetting was stock. For those at sea level, you may have to go one size larger on the main jet. Enjoy the video..
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