When Motorcycle/scooters drives 3500-10000 km, it is necessary to carefully clean the carbon deposit from the combustionchamber,valve seat cycle, the exhaust. Clearing the combustion chamber Coke can be removed with a bamboo scissors, the coke in the exhaust can be removed with a screwdriver, do not scratch the combustion chamber wall, the valve seat face and exhaust wall. After removing the coke, cleaning it with clean gasoline or kerosene, then wipe it with a clean,soft cloth and reassemble it.