General failures’ analysis
GS35 – GS350 – MT350 – MT3500 chainsaws
7) Trouble shooting: ENGINE DOES NOT START
Symptoms Causes Remedies Go to
1.
The engine does not
turn over
1.a
Starter assy defect or
broken starter rope
1.b
Internal damage
1.a
Check starter assy or starter rope
replacement
1.b
Check thermal group and replace
worn components
Section 3
Section 1
2.
There is no
compression
2.a
Spark plug looses
2.b
Piston ring, cylinder and
piston worn
2.a
Tighten spark plug. Compression
test
2.b
Replace worn or damaged parts.
Compression test
Section 1
Section 1
3.
No spark
3.a
Ignition switch is in “OFF”
position
3.b
Ignition system defected
3.c
Broken spark plug or
wrong type
3.a
Switch “ON”
and restart
3.b
Inspect and/or replace
3.c
Replace the spark plug
Section 3
Section 3
4.
Fuel does not reach
the carburetor, the
machine stops after 5
minutes
4.a
Fuel filter or breather
blocked
4.b
Fuel system is leaking air
4.c
Wet spark plug, flooded
cylinder
4.a
Clean or replace
4.b
Tightness test on fuel system
4.c
Carburetor inspection (point 5.c).
Take off spark plug, rotate the engine,
blow inside cylinder passing through
spark plug hole, dry the spark plug
and restart
Section 2
Section 2
Section 5
5.
Wrong carburetion
setting or erratic
throttle response
5.a
Air filter dirty
5.b
Wrong L and H setting
5.c
Carburetor problems
5.d Manifold problems
5.a
Clean or replace
5.b Adjust the carburetion according
the above
5.c Carburetor inspection
5.d Manifold tightness
Section 5
Section 5
Section 5
Section 2
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