Stihl MS 240 Instruction Manual page 15

Condition
No spark
14
Cause
Spark plug faulty
Faulty insulation or short in short
circuit wire
Break in ignition lead or insulation
damaged
Ignition module faulty
Remedy
Install new spark plug
Check short circuit wire for short
circuit to ground
Check ignition lead and replace if
necessary
Install new ignition module
MS 240, MS 260, MS 260 C