Engine Stops Suddenly - Stihl MS 661 Manual

8.7.5

Engine stops suddenly

Engine stops suddenly
– Check fuel system (pickup
body, tank vent, fuel hoses),
b 13.11
– Check plug and screw
connections on control unit or
between wiring harness and
switch unit
– Check start
detection (microswitch,
activating lever) and clean if
necessary
– Check start detection, wiring
harness, plug and screw
connections, b 8.3.5,
b 8.3.6, b 8.3.3
– Check the solenoid valve,
b 8.3.4
74
Power tool
in order?
no
Fuel system
in order?
yes
Connection
and tightness of
connectors OK?
yes
Mechanically
in order?
yes
Specified values
obtained?, b 8.3.6
yes
Specified values
obtained?, b 8.3.4
yes
yes
Troubleshooting
completed
no
– Repair the fuel
system
– Check the plug
no
connectors, replace wiring
harness and/ or switch unit
if necessary, b 8.3.3,
b 7.10, b 8.5
no
– Replace switch unit,
b 8.5
– Check the switch unit
no
and wiring harness and
clean or replace if
necessary, b 8.3.5,
b 8.3.6, b 8.5, b 7.10
no
– Install new carburetor,
b 13.4
– Check engine for leaks,
b 6.2
MS 661, MS 661 C-M