Stihl FS 240 Service Manual page 13

Problem
Starter rope is difficult to pull or
rewinds very slowly
12
Cause
Starter mechanism is very dirty
Spring in ErgoStart spring housing
is fatigued
At very low outside temperatures:
Lubricant oil on the rewind spring
becomes viscous (spring winding
stick together) or moisture has
penetrated the rewind spring
(spring windings are frozen)
FS 240 C, FS 260 C, FS 360 C, FS 410 C, FS 460 C-M
Remedy
Thoroughly clean complete starter
mechanism
Replace ErgoStart
Coat rewind spring with a little
standard solvent-based degreasant
(containing no chlorinated or
halogenated hydrocarbons), then
pull rope carefully several times
until normal action is restored