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Troubleshooting Fuel System (Carbureted) Problem: Carburetor Too Rich (0-1/4 Opening) Condition Remedy 1. Choke plunger will not seat 1. Adjust—service—replace choke cable—plunger assembly 2. Pilot air screw (VM-style) too far in 3. Fuel mixture screw (TM-style) too far out 2. Adjust pilot air screw 3. Adjust fuel mixture screw 4. Pilot air passage obstructed—damaged 4. Remove obstruction—replace pilot air screw— carburetor 5. Float/inlet needle obstructed—damaged— adjusted incorrectly 5. Remove obstruction—replace inlet needle—float— adjust float tab 6. Pilot jet loose 6. Tighten pilot jet Problem: Carburetor Too Rich (1/4-3/4 Opening) Condition Remedy 1. Pilot air screw (VM-style) too far in 2. Fuel micture screw (TM-style) too far out 1. Adjust pilot air screw 2. Adjust fuel mixture screw 3. Needle jet—jet needle worn—adjusted incorrectly— incorrect 3. Replace—adjust needle jet—replace jet needle 4. Pilot air passage obstructed—damaged 4. Remove obstruction—replace pilot air screw— carburetor 5. Pilot jet loose 5. Tighten pilot jet 6. Float/inlet needle obstructed—damaged—adjusted incorrectly 6. Remove obstruction—replace inlet needle—float— adjust float tab 7. Main jet loose—too large 7. Tighten—replace main jet 8. Primary air passage obstructed 8. Remove obstruction Problem: Carburetor Too Rich (3/4-WOT Opening) Condition Remedy 1. Main jet loose—too large 1. Tighten—replace with smaller main jet 2. Float/inlet needle obstructed—damaged—adjusted incorrectly 2. Remove obstruction—replace inlet needle—float— adjust float tab 3. Needle jet—jet needle worn—adjusted incorrectly—incorrect 3. Replace—adjust needle jet—replace jet needle 4 4-31 |