Cut-Off Engine Speed Is Not Reached - Stihl MS 661 Manual

8.7.6

Cut-off engine speed is not reached

Maximum engine speed less
than 13,000 rpm
– Check air filter and spark arresting
screen in muffler (if fitted)
and clean or replace if necessary,
b 13.1, b 6.1
– Check chain tension and
chain lubrication
–Calibrate the control unit,
b 8.1
– Check plug connections on
control unit,
b 8.3.6, b 8.3.3
– Check start detection,
wires, plug and screw
connections, b 8.3.5,
b 8.3.3
MS 661, MS 661 C-M
Max. engine speed
above 13,000 rpm?
no
Connection
and tightness of
connector in
order?
yes
Specified values
obtained?, b 8.3.6
yes
– Look for fault in fuel
system, check
engine for leaks,
b 13.11, b 13.5,
b 6.2
yes
Troubleshooting
completed
– Check connectors,
no
replace insulated housing
or wiring harnessif
necessary, b 7.10
no
– Replace switch unit,
b 8.5
75