Stihl MS 500i Instruction Manual page 25

18 Troubleshooting
► If the malfunction still exists: Take the action described in the following table.
Condition
Engine does not
start.
Poor acceleration
Saw chain does not
rotate when throttle is
opened.
Smoke or burning
smell while cutting.
18.2 Clearing the Combustion
Chamber
► Engage the chain brake.
4 3
2
► Rotate the filter cover lock (1) a quarter turn
counterclockwise.
► Remove the filter cover (2).
► Rotate the shroud lock (1) a quarter turn coun‐
terclockwise.
► Remove the shroud (4).
► Pull off the spark plug boot (5).
► Unscrew the spark plug.
► Dry the spark plug.
0458-809-0121-B. VA0.A21.
Cause
Insufficient fuel in the
tank.
Engine is flooded.
The chain is over-ten‐
sioned.
Chain lubrication sys‐
tem is supplying
insufficient chain oil.
The chain brake is
engaged.
The chain is over-ten‐
sioned.
Bar nose sprocket is
blocked.
Chain is not properly
sharpened.
Insufficient chain oil
in the tank.
Chain lubrication sys‐
tem is supplying
insufficient chain oil.
The chain is over-ten‐
sioned.
Chainsaw is not
being used properly.
1
Remedy
► Mix fuel and refuel the chainsaw.
► Clear the combustion chamber.
► Tension chain properly.
► Increase oil feed rate.
► Disengage the chain brake.
► Tension chain properly.
► Clean the bar nose sprocket with STIHL resin solvent.
► Sharpen the chain properly.
► Fill up with chain oil.
► Increase oil feed rate.
► Tension chain properly.
► Have correct use explained, then practice.
WARNING
■ Unconfined sparks may occur if the starter grip
is pulled after the spark plug boot has been
removed. Sparks may cause a fire or an
explosion in an easily combustible or explo‐
sive environment. This can result in serious or
5
fatal injuries and damage to property.
► Depress the stop switch and keep it
depressed before pulling the starter grip.
► Depress the stop switch and hold it in that
position.
► Pull the starter grip and guide it back several
times.
The combustion chamber is cleared.
► Insert and tighten down the spark plug.
6
5
English
25