Zenoah GZ381 Manuel D'utilisation page 33

To learn more about how to fit the starter on the
chainsaw, see heading
on page 33
To fit the starter on the chainsaw
1. Pull out the starter cord and place the starter in
position against the crankcase.
2. Slowly release the starter cord so that the pulley
engages with the pawls.
3. Tighten the screws that hold the starter.
To clean the air filter
The air filter must be regulary cleaned to remove dust
and dirt in order to avoid:
• Carburettor malfunctions.
• Starting problems.
• Loss of engine power.
• Unnecessary wear to engine parts.
• Excessive fuel consumption.
1. Lift up the cylinder cover.
2. Remove the air filter.
3. Brush or shake the air filter clean. Wash it in
detergent and water to clean it more thoroughly.
Note: An air filter that has been in use for a long
time can't be clean completely. The filter must
therefore be replaced with a new one at regular
intervals. Always replace a damaged air filter.
4. Refit the air filter and make sure that the air filter
seals tightly against the filter holder. (Fig. 107)
A Zenoah chainsaw can be equipped with different types
of air filter according to working conditions, weather,
season etcetera. Contact your servicing dealer for
advice.
To do a check of the spark plug
The spark plug condition is influenced by an incorrect
carburetor adjustment, an incorrect fuel mixture (too
much or incorrect type of oil) and a dirty air filter. These
factors cause deposits on the spark plug electrodes,
which may result in operating problems and starting
difficulties.
Note: Always check the spark plug before you take any
further action if the product is low on power, difficult to
start or runs poorly at idle speed.
1. Clean the spark plug if it is dirty.
2. Do a check of the electrode gap and make sure that
it is 0,5 mm.
3. Replace the spark plug once a month or earlier if
necessary. (Fig. 108)
272 - 008 -
To fit the starter on the chainsaw
CAUTION: Always use the recommended
spark plug type! Use of the wrong spark plug
can damage the piston/cylinder. For
recommended spark plug, see heading
Technical data on page 38
To sharpen the saw chain
General advice on sharpening the cutting
teeth
Never use a blunt saw chain. When the saw chain is
blunt you have to exert more pressure to force the bar
through the wood and the chips will be very small. If the
saw chain is very blunt it will produce wood powder and
no chips or shavings.
A sharp saw chain eats its way through the wood and
produces long, thick chips or shavings.
The cutting part of the saw chain is called the cutter and
consists of a cutting tooth (A) and the depth gauge (B).
The cutters cutting depth is determined by the difference
in height between the two (depth gauge setting).
(Fig. 109)
When you sharpen a cutting tooth there are four
important factors to remember:
• Filing angle.
(Fig. 110)
• Cutting angle.
(Fig. 111)
• File position.
(Fig. 112)
• Round file diameter.
It is very difficult to sharpen a saw chain correctly
without the right equipment. Zenoah recommends that
you use our file gauge. This will help you obtain the
maximum kickback reduction and cutting performance
from your saw chain.
(Fig. 113)
WARNING: Departure from the sharpening
instructions considerably increases the risk
of kickback.
Note: See instructions under
38 for information about sharpening your saw chain.
To sharpen the cutting teeth
To sharpen cutting teeth you will need a round file and a
file gauge. See instructions under
page 38 for information on the size of file and gauge
that are recommended for the saw chain fitted to your
product.
1. Make sure that the saw chain is correctly tensioned.
A slack chain will move sideways, making it more
Technical data on page
Technical data on
33