Here’s an easy 15-20 min way to make your scooter grunt a bit deeper in the mid-range rpms. You may loose a teeny-tiny bit of power doing this. But the C3 is already slow. 😛 – I thought this was fun, hope you do too! But before you get your hands dirty, make sure to watch at 3:53 for a panel screw I almost forgot to tell you about! sorry!!