Troubleshooting - Husqvarna 531RB Workshop Manual

Start
The engine is not easy to start
Idle speed (low speed)
The engine does not operate on
idle speed
The idle speed is too low
The idle speed does not become
stable
935 - 001 -

8 Troubleshooting

The stop screw for the throttle does not operate correctly
Blocked fuel filter
Blocked fuel hose
Air in fuel pipes
Incorrect/unsatisfactory fuel
The needle valve is defective
The lever arm of the needle valve is damaged
The lever arm of the needle valve does not operate correctly
Blocked needle valve
The needle valve is worn
Object in the needle valve groove
The stop screw for the throttle does not operate correctly
Blocked fuel filter
Blocked fuel hose
Air in fuel pipes
The carburetor is not attached correctly
The lever arm of the needle valve does not operate correctly
Defective heat insulation seal
The lever arm of the needle valve is damaged
The lever arm of the needle valve is too high
The lever arm of the needle valve does not operate correctly
The needle valve is worn
Object in the needle valve groove
The stop screw for the throttle does not operate correctly
Blocked fuel filter
Blocked fuel hose
Air in fuel pipes
Incorrect/unsatisfactory fuel
The needle valve is defective
The carburetor is not attached correctly
The lever arm of the needle valve does not operate correctly
The needle valve spring is not attached correctly
The needle valve is worn
Object in the needle valve groove
Troubleshooting- 57