Ignition System - Stihl SR 430 Manual

3.3

Ignition System

Exercise extreme caution while
carrying out maintenance and
repair work on the ignition system.
The high voltages which occur can
cause serious or fatal accidents.
Condition
Engine runs roughly, misfires,
temporary loss of power
The carburetor or engine may also be the cause of poor engine running behavior
10
Cause
Spark plug boot is loose
Spark plug sooted, smeared with oil Clean the spark plug or replace if
Fuel/oil mixture
– too much oil
Incorrect air gap between ignition
module and flywheel
Flywheel shows signs of
damage (e.g. scores) or pole shoes
have turned blue
Ignition timing out of adjustment,
flywheel warped, key in flywheel
sheared
Flywheel magnetization weak –
pole shoes have turned blue
Irregular spark
Remedy
Press boot firmly onto spark plug
and fit new spring if necessary
necessary.
Use correct mixture of fuel and oil
Set air gap correctly
Install new flywheel
Install new flywheel
Install new flywheel
Check operation of stop switch 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.
SR 430, SR 450