on this engine you'd get 0 gain, even with full "stage one" mods (what a silly name) you'll get nothing. infact these so-called "stage one" mods only push your powerband higher up the rev range which robs these engines of what little bottom-end torque they produce.
My advice is to ensure you have the correct plug gaps, clean plugs (stock), fresh (stock) wires, a fully charged battery etc
@anyone who wishes to argue
feel free to compare a set of stock wires versus a set of the best wires on a dyno on an alto and you'll see what i'm talking about.