Husqvarna 331R Operator's Manual page 19

CAUTION: Do not use gasoline or oil
intended for four-stroke engines.
8. Replace the air filter if it is too dirty to fully clean it.
Always replace a damaged air filter.
9. Also clean the inner surface of the filter cover. Use
air or a brush.
10. Make sure that the filter is dry before you assemble
it.
Fuel filter
When the engine runs short of fuel supply, make sure
that the fuel tank cap and the fuel filter (A) is not
blocked.
A
To add grease to the bevel gear
Make sure that the bevel gear is filled 3/4 full with bevel
gear grease.
To examine the spark plug
CAUTION: Always use the recommended
spark plug type. Incorrect spark plug type
can cause damage to the product.
1158 - 005 - 26.03.2020
• Examine the spark plug if the engine is low on
power, is not easy to start or does not operate
correctly at idle speed.
• To decrease the risk of unwanted material on the
spark plug electrodes, obey these instructions:
a) Make sure that the idle speed is correctly
adjusted.
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 21 .
• Replace the spark plug if it is necessary.
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.
Technical data
19