Suzuki DF25/DF30 Four Stroke Service Manual, Page 39Get this manual
2-12 PERIODIC MAINTENANCE NOTEThere are two types of carburetor as follows(A) Carburetor with covered pilot screw The pilot screw turns open are preset at factory and the screw is covered by plateDo not try to remove the cover over the pilot screw(B) Carburetor with uncovered pilot screw For this type of carburetor, the pilot screw turns open are adjustable1Turn the pilot screw to bring it to the standard specification(for applicable carburetor only) Pilot screw initial setting DF25 1- turns open DF30 1- turns open
NOTEWhen turning pilot screws fully in, lightly seat them onlyDo not over tighten to avoid damaging needle valve and seat2Turn the idle adjusting screw Turning inwardEngine speed becomes higher (clockwise) Turning outwardEngine speed becomes lower (counterclockwise)