You tighten the motor adjustment screw until the pitch becomes much louder and "screechier" than when you started. Then you back off the screw 1/4 turn. You should do it in semi firing twice per adjustment. When you do adjustment, don't move the screw more than 1/4 turn per trial.
And $70 for ICS gears in the U.S. is robbery. I used to pay $59 Can. for them. Go to Airsoft Elite or Airsplat as both carry ICS (AE is the U.S. distributor). And you can't use anyone else's gears unless you change the bushings as the axle holes are different diameters.
Age verifier Northern Alberta
Democracy is two wolves and a sheep discussing what's for dinner.
Freedom is the wolves limping away while the sheep reloads.
Never confuse freedom with democracy.