Teofilo Yamaguchi 5 First of all, I was tracking down the faulty part of my scooter, by doing so I changed many old parts like air filter, cleaned the carburetor, replaced the CDI, spark plug, but nothing helped to stop my scooter from lagging or bugging and not starting after running 1km of distance. The engine was weak and hard to start, but after I changed the spark plug cable with the coil all problem was solved.Reaches top speed very fast, has quick response than when I bought it. Engine it starts smoothly and I can now reduce the engine throttling to the lowest without getting it to shutoff. Is really great.