Stihl MS 441 User Manual

17MS 441, MS 441 C
Condition Cause Remedy
Engine speed drops quickly
under load – low power
Air filter dirty Clean air filter, replace if necessary
Throttle shutter does not open fully Check throttle cable and rod
Tank vent faulty Fit new tank vent
Fuel pick-up body dirty Install a new pick-up body
Fuel strainer dirty Clean fuel strainer in carburetor,
replace if necessary
Leak in fuel line from tank to fuel
pump
Seal connections, replace line if
necessary
Setting of high speed screw H too
rich
Check basic carburetor setting,
adjust if necessary
Main jet bores or ports blocked Clean carburetor
Pump diaphragm damaged or
fatigued
Fit a new pump diaphragm
Impulse hose damaged or kinked Fit a new impulse hose
Engine runs extremely richly, no
power and very low final speed
Air flap does not open Check carburetor; install a new
carburetor if necessary
Engine too rich, loss of power and
final speed too low
Air flap does not open fully at full
throttle
Check carburetor; install a new
carburetor if necessary
Erratic idling, too lean Air flap does not close completely Check carburetor; install a new
carburetor if necessary

Stihl MS 441 Specifications

General

Displacement	70.7 cc
Weight	6.6 kg
Fuel Capacity	0.78 L
Chain Oil Capacity	0.36 l
Oil Capacity	0.36 l
Oil tank volume	0.36 l
Chain pitch	3/8"