Spark Plug; Maintenance Schedule - Jonsered GT2125 Operator's Manual

Spark plug

The spark plug condition is influenced by:
• Incorrect carburettor adjustment.
• An incorrect fuel mixture (too much or incorrect type of
oil).
• A dirty air filter.
These factors cause deposits on the spark plug electrodes,
which may result in operating problems and starting
difficulties.
If the machine is low on power, difficult to start or runs poorly
at idle speed: always check the spark plug first before taking
any further action. If the spark plug is dirty, clean it and check
that the electrode gap is 0.5 mm (0,020"). The spark plug
should be replaced after about a month in operation or earlier
if necessary.
CAUTION! Always use the recommended spark plug type!
Use of the wrong spark plug can damage the piston/cylinder.

Maintenance schedule

Below you will find some general maintenance instructions. If
you need further information please contact your service
workshop.
Daily maintenance
• Check throttle trigger and throttle trigger lockout function.
• Check that the stop switch works correctly.
• Check that the cutting attachment always stops when the
engine is idling.
• Clean the outside of the machine.
• Check that the harness is not damaged.
• Check that the blade guard is not damaged or cracked.
Replace the blade guard if it is exposed to impact or is
cracked.
• Check that the blade is properly centered, sharp and
without cracks.
• Check that the trimmer head is undamaged and not
cracked. Replace the trimmer head if necessary.
• A non-balanced blade/trimmer head induces heavy
vibrations that may damage the machine.
• Check that the blade nut is sufficiently tightened.
• Check that the transport guard for the blade is intact and
that it can be secured correctly.
• Check that nuts and screws are tight.
• Check that there are no fuel leaks from the engine, tank or
fuel lines.
MAINTENANCE
Weekly maintenance
• Check the starter and starter cord.
• Clean the outside of the carburettor.
• Clean the outside of the spark plug. Remove it and check
the electrode gap. Adjust the gap to 0.5 mm (.20"), or
replace the spark plug. Check that the spark plug is fitted
with a suppressor.
• Clean the cooling fins on the cylinder and check that the
air intake near the starter is not blocked.
• Check that the bevel gear is filled with grease up to 3/4.
Use special grease.
• Clean the air filter.
• Clean or replace the spark arrestor mesh on the muffler
(only applies to mufflers without a catalytic converter).
Monthly maintenance
• Clean the fuel tank.
• Clean the outside of the carburettor and the space around
it.
• Check fuel hose for cracks or other damage. Change if
necessary.
• Change the fuel filter in fuel tank.
• Check electrical wires and connections.
• Replace the spark plug. Check that the spark plug is fitted
with a suppressor.
• Change the air filter.
• Check and clean the spark arrestor mesh on the muffler
(only applies to mufflers fitted with a catalytic converter).
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