satria got caburetor type engine and also injection engine
i think urs is the old type caburetor engine is it??
u can change to injection type engine but
it is not worth with the cost u spend for convert to injection!!!
sommore injection respond is not as good as caburetor
u will feel lost of power!
try to change to 4G91 for better fuel comsumption and better power (many ZTH ppl recomended)