Ignition System - Stihl MS 261 User Manual

3.5

Ignition System

Condition
Engine runs roughly, misfires,
temporary loss of power
14
Cause
Spark plug boot is loose
Spark plug sooted, smeared with oil Clean the spark plug or replace if
Ignition lead loose in ignition
module
Fuel/oil mixture
– too much oil
Incorrect air gap between ignition
module and flywheel
Flywheel cracked or
damaged or pole shoes have
turned blue
Ignition timing wrong, flywheel out
of adjustment
– key in flywheel has sheared off
Weak magnetization in flywheel
Irregular spark
Remedy
Press boot firmly onto spark plug
and fit new spring if necessary
necessary.
If sooting keeps recurring, check air
filter
Install new ignition lead
Use correct mixture of fuel and oil
Set air gap correctly
Install new flywheel
Install new flywheel
Install new flywheel
Check operation of switch shaft/
contact spring and ignition module
Faulty insulation or break in ignition
lead or short circuit wire. Check
ignition lead/ignition module and
replace ignition module if
necessary.
Check operation of spark plug.
Clean the spark plug or replace if
necessary.
MS 261, MS 261 C