Troubleshooting - Husqvarna 331R Operator's Manual

b) Make sure that the fuel mixture is correct.
c) Make sure that the air filter is clean.
• If the spark plug is dirty, clean it and make sure that
the electrode gap is correct, refer to
on page 18 . (Fig. 61)
• Replace the spark plug if it is necessary.
Starting failure
Check Possible cause
Stop button Stop position
Starter pawls Binding pawls
Fuel tank Incorrect fuel
type.
Carburettor Adjustment of
the idle speed.
Spark (no Spark plug dirty
spark) or wet.
Spark plug
clearance in-
correct.
Spark plug Spark plug
loose.
Engine starts but does not stay running
Check Possible cause
Fuel tank Incorrect fuel
type.
Carburettor Engine will not
idle correctly.
Air filter Clogged air fil-
ter.
1544 - 005 - 03.04.2023
Technical data

Troubleshooting

Solution
Set the stop switch to the start position.
Adjust or replace the pawls.
Clean around the pawls.
Speak to an approved servicing dealer.
Drain it and use correct fuel.
Adjust the idle speed with the T-screw.
Make sure that the spark plug is dry and clean.
Clean the spark plug. Check that the electrode gap is correct. Make sure that the
spark plug is installed with a suppressor.
Refer to technical data for correct electrode gap.
Tighten the spark plug.
Solution
Drain it and use correct fuel.
Speak to your servicing dealer.
Clean the air filter.
To sharpen grass cutters and grass
blades
1. Sharpen grass cutters and grass blades with a
single-cut flat file.
2. Sharpen all edges of the grass cutters and blades
equally to keep the balance. (Fig. 62)
17