Engine Does Not Start - Stihl MS 661 Manual

8.6.1

Engine does not start

Engine does not start
– Set the Master Control
lever to } .
– Check ignition (spark
plug, spark plug boot,
ignition spark), b 7.5
– Check start detection,
(microswitch, activating
lever), b 8.5
– Check start detection and
wiring harness electrically,
b 8.3.5, b 8.3.6
– Check the solenoid valve,
b 8.3.4
70
Can engine
be started?
no
no
Ignition
spark?
Mechanically
in order?
yes
Specified values
obtained?, b 8.3.6
yes
Specified values
obtained? b 8.3.4
yes
– Look for fault in fuel
system, check engine for
leaks, b 13.11, b 13.5,
b 6.2
yes
Troubleshooting completed
– Check ignition system
with aid of "Ignition System
Troubleshooting Chart",
b 7.13
yes
Can the engine be
started?
no
– Check the switch unit and
clean or replace if
necessary, b 8.5
– Check the switch unit and
no
wiring harness and clean or
replace if necessary,
b 8.3.5, b 8.3.6
no
– Install new carburetor,
b 13.4
MS 661, MS 661 C-M
yes
no