2001 Mercury Mariner 50-60HP Factory Service Manual, Page 135Get this manual
TIMING, SYNCHRONIZING,ADJUSTING
3Rev engine or times and allow to idle for 15 secondsaIf the engine holds stable idle condition, then no other adjustments are necessarybIf the engine has an unstable idle condition, then carburetor synchronization is requiredRefer to Carburetor Synchronization preceding
Dashpot Adjustment
NOTE: The function of the dashpot is to eliminate stalling after rapid decelerationWhen the engine drops quickly in RPM, the linkage will contact the dashpot plunger and gradually bring the RPM down until the correct engine idle speed is reached1Open the throttle cam until the dashpot linkage is fully open and the plunger is fully extended2Using feeler gage, measure the clearance between the end of the plunger and the face of the adjacent bracketThe clearance should be 0.0500.060 in(1.31.5mm) 3If the gap needs to be adjusted because it does not fall within the above specs, loosen the jam nut (12mm wrench) and turn the dashpot (10mm wrench) in the appropriate directionTighten the jam nut when the correct setting is attained