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