Mantas
New Member
I had a stock exhaust on my 2012 Piaggio nrg and i bought a Yasuni z kevlar and after the swap the scooter lost all speed it doesn't pull like it used to and the top speed is gone too. Before the swap it was doing 90 km/h max and it was accelerating quite fast for a full on stock 49 cc scooter. And now its just slugish