Timing Advance Key aka Rocket Key
This is the biggest bang for your buck when it comes to upgrading your scooter or go kart (or other). The timing key aka rocket key advances your timing 7 degrees which advances your spark. What does this do? It adds top speeds of 2-3 mph and about 10% more torque. This key will fit any 33cc, 36cc, 43cc, 49cc, and 52cc Hausheng engine. These motors are the most common motors used on scooters, pocket bikes, mini choppers, and go karts in the USA market. This key fits the ScooterX Dirt Dog, X-Racer, Baja, Powerkart, and SkaterX.