1996 Mercury Force 25 HP Service Manual 90-830894 895, Page 30Get this manual
Problem: Engine Floods Possible Cause Dirt or debris are preventing inlet needle from seatingWorn inlet needlePunctured floatIncorrect float settingProblem: Engine Runs Too Rich Possible Cause Fuel level too highCarburetor floodsIdle nozzleair holes pluggedRestricted air flowMain fuel jet looseProblem: Fuel Blowback Out of Carburetor Possible Cause Chipped or broken reeds on reed blockPossible Cause Excessive preload on reedsProblem: Engine Runs Too Lean Possible Cause Carburetor is looseAir leaks past mixing chamber coverFuel level is too lowClogged high speed jetRestricted fuel flow to carburetorIncorrect high speed jetIdle mixture set too leanAir leakage into fuel systemCorrective Action Tighten bolts securelyTighten cover or replace gasketReset float levelInspect jet for varnish or debris and cleanCheck fuel lines and filter(s) for restricted flowRefer to main jet chart and replace with proper jetAdjust to run richer (turn idle mix screw counterclockwise)Inspect fuel line connections, hose clamps, fuel pump and fuel outlet tube (located in fuel tank) for loose fittingsRefer to Section 3B for checking for restriction of fuel flow caused by anti-siphon valveReplace reedsReplace reedsCorrective Action Corrective Action Corrective Action Reset float to correct levelSee preceding "Engine Floods Blowout with compressed airInspect cowl air inlet and carburetor for obstructionsRetighten jetCorrective Action Flush out inlet seat and clean inlet needleReplaceReplaceReset float Anti-siphon valve restricting fuel flow