Engine Speed Drops Under Load - Engine Down On Power - Stihl MS 661 Manual

8.7.3 Engine speed drops under load
– engine down on power
Engine speed drops under load –
low power
– Check the air filter and clean or
replace if necessary, b 13.1
– Calibrate the control unit,
b
Troubleshooting completed
72
yes
Power tool in order?
no
– Look for fault in fuel
system, check engine for
leaks,
b 13.5, b 6.2
MS 661, MS 661 C-M