Suzuki DF25/DF30 Four Stroke Service Manual, Page 42Get this manual
PERIODIC MAINTENANCE 2-15 11Adjust the throttle valve screw(s) until the carburetors are synchronized (steel balls at the same height in each of the tubes) and the engine idles smoothly
NOTE: If the engine speed has been raised or lowered due to the adjustment, it is necessary to reset the engine at the specified idle speed by turning idle adjusting screw of No.3 carburetor(See page 2-11)
12Shift into the "Forward" position, then check the in-gear idle speedIn-gear idle speed: Approx850 rmin 13After stopping engine, remove the synchronizer from the impulse plug hole; then install the impulse plugs
DASHPOT ADJUSTMENT The purpose of the dashpot is to provide controlled return to idle speed when the throttle is closedThe effect of properly functioning and adjusted dashpot will be engine speed holding shortly at approximately 1500 rmin and then slowly dropping to idleThe dashpot's ability to perform controlled return to idle as designed should always be checked and adjusted if necessary after synchronizing carburetor throttle valvesAdjust the dashpot effect using the following procedures1Start the engine and bring it up to normal operating temperature2Turn the No.3 carburetor idle adjust screw to set engine speed at 4000 rmin counting the number of idle adjust screw turns between idle and 4000 rmin