7
Carburetor Floods
1. Dirt or foreign particles preventing Remove , clean and replace.
inlet needle from seating.
2. Diaphragm lever spring not seated on lever dimple. Remove , lever and reinstall
3. Diaphragm improperly installed in carburetor. Replace diaphragm or correct
installation.
Engine will Not Accelerate.
1. Idle adjusting screw set too lean. Enrich idle adjustment
2. Incorrect setting on diaphragm lever. Reset
3. Diaphragm cover plate loose. Tighten
4. Diaphragm gasket leaking. Replace
5. Main fuel orifice plugged. Remove diaphragm cover,
diaphragm lever and main adjusting
screw. Clean out orifice by blowing
through main adjustment threaded
hole.
Engine Will Not Idle
1. Incorrect idle adjustment. Reset to best idle.
2. Idle discharge ports or channels clogged. Blow out with compressed air, or, if
compressed air is not available,
clean and flush with gasoline.
3. Diaphragm lever set incorrectly. Reset diaphragm lever so it is flush
with the floor of the diaphragm
chamber.
4. Throttle shutter cocked in the throttle Reset
bore causing fast idle.
5. Dirt nozzle check valve. Clean or replace
6. Welch plug covering the idle discharge ports Replace welch plug, following
does not seal. This causes the engine to idle instructions outlined in service hints.
with idle adjustment shut off.
Engine Runs Out Lean
1. Tank vent not operating correctly. Clean, if possible, or replace
2.
Leak in fuel system from tank to pump Tighten or replace fittings or line
3.
Ruptured fuel pump diaphragm
.
Replace
4. Main fuel orifice plugged. Clean
Carburetor Runs Rich With Main Adjustment Shut Off
1.
The 1/8 " diameter nozzle channel plug, or nozzle Install new plug or new cage
check valve cage, is not sealing.
TROUBLE SHOOTING
NOTE:IN MAKING CARBURETOR ADJUSTMENTS TURN ADJUSTMENTS CAREFULLY AND
GENTLY -DO NOT RAM ADJUSTMENTS INTO SEATS.
Set engine idling speed in accordance with engine manufacturer's recommendation.
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