Stihl Km 55 R Manual

KM 55 R, KM 55 RCEnglish
9 stay clean and need no service or 
maintenance. If you experience loss of 
performance and you suspect a clogged 
screen, have your muffler maintained by 
a STIHL servicing dealer.
MAINTENANCE, REPAIR AND 
STORING
Maintenance, replacement, or repair 
of the emission control devices and 
systems may be performed by any 
nonroad engine repair establishment 
or individual. However, if you make a 
warranty claim for a component 
which has not been serviced or 
maintained properly...

KM 55 R, KM 55 RC English
10The following STIHL KombiTools may 
be mounted on the KombiEngine:
The barrier bar supplied with the 
machine must be mounted to the loop 
handle – see also Mounting the Loop 
Handle.
Approved KombiTools
HT-KM
BF-KM
470BA018 KN
FCS-KMFCB-KM
KW-KMKB-KM
FH-KM
FS-KMFS-KM
FSB-KMBG-KM
KombiTool Purpose
FS-KM Brushcutter with 
mowing head
FS-KM Brushcutter with 
grass cutting blade
FSB-KM Brushcutter with 
mowing head
HL-KM 135° Hedge trimmer, 
adjustable
HL-KM 0° Hedge trimmer...

KM 55 R, KM 55 RCEnglish
11 A barrier bar is supplied with the 
machine. Attach the barrier bar to the 
loop handle.
NInsert square nuts (1) in the barrier 
bar (2) – the holes must line upNInsert the clamp (3) in the loop 
handle (4) and position them 
together on the shaft (5)
NPosition clamp (6)
NPosition barrier bar (2) – note 
position!
NLine up the holes
NInsert bolts (7) in the holes – and 
screw them into the barrier bar as 
far as possibleNFit the loop handle (4) at a distance 
of (A) approx. 20...

KM 55 R, KM 55 RC English
12 This engine is certified to operate on 
unleaded gasoline and the STIHL two-
stroke engine oil at a mix ratio of 50:1.
Your engine requires a mixture of high-
quality gasoline and quality two-stroke 
air cooled engine oil.
Use mid-grade unleaded gasoline with a 
minimum octane rating of 89 (R+M/2). If 
the octane rating of the mid-grade 
gasoline in your area is lower, use 
premium unleaded fuel.
Fuel with a lower octane rating may 
increase engine temperatures. This, in...

KM 55 R, KM 55 RCEnglish
13 Before fueling, clean the filler cap and 
the area around it to ensure that no dirt 
falls into the tank.
Always thoroughly shake the mixture in 
the canister before fueling your 
machine.
Controls
1Stop switch
2Throttle trigger lockout
3Throttle lever
4Tongue of throttle trigger
5Catch
Positions of stop switch
6I – normal run position – the engine 
is running or can start
70 – engine off – the ignition is 
switched off
Starting
NMove the stop switch toI.
NPress down the...

KM 55 R, KM 55 RC English
14 NSet the choke lever (8) to
NPress the fuel pump bulb (9) at least 
five times – even if the bulb is 
already filled with fuel.Starting
NPlace the unit on the ground: Check 
that the working tool is not touching 
the ground or any other obstacles – 
see also Starting / Stopping the 
Engine in the KombiTool 
instruction manual.
NMake sure you have a safe and 
secure footing.
NHold the unit with your left hand and 
press it down firmly – your thumb 
should be under the fan...

KM 55 R, KM 55 RCEnglish
15 Both versions
NDo not let the starter grip snap back. 
Guide it slowly back into the housing 
so that the starter rope can rewind 
properly.
NCrank the engine until it fires – after 
no more than five pulls, move the 
choke lever (8) to e.
NContinue cranking.
As soon as the engine runs
NSqueeze the throttle trigger to 
disengage the tongue – the engine 
will settle down to idle speed.
Your machine is now ready for 
operation.
Stopping the engine
NMove the stop switch to0.
If...

KM 55 R, KM 55 RC English
16 If there is a noticeable loss of engine 
power
NSet the choke lever to g.
NPress in the tab (1) and swing the 
filter cover (2) down. 
NClean away loose dirt from around 
the filter.NRemove the felt element (3) from 
the filter housing (4) and replace it – 
knock out or blow out as a 
temporary measure – do not wash.
NReplace damaged parts.
NFit the felt element (3) in the filter 
housing (4).
NClose the filter cover so that it snaps 
into position.Exhaust emissions are...

KM 55 R, KM 55 RCEnglish
17 The carburetor comes from the factory 
with a standard setting.
This setting provides an optimum fuel-air 
mixture under most operating 
conditions.
With this carburetor it is only possible to 
adjust the high speed screw within fine 
limits.
Standard Setting
NStopping the Engine
NMount the KombiTool complete with 
working tool or cutting attachment.
NCheck the air filter and replace it if 
necessary.
NHave the spark arresting screen in 
the muffler checked (not all 
markets)...

KM 55 R, KM 55 RC English
18moving and then rotate the screw 
another 1/2 to 1 turn in the same 
direction.
Erratic idling behavior, engine stops 
even though setting of LA-screw has 
been corrected, poor acceleration
Idle setting is too lean:
NIdle setting is too lean: Rotate the 
low speed screw (L) about 1/4 turn 
counterclockwise until the engine 
runs and accelerates smoothly.
Erratic idling behavior 
Idle setting is too rich
NRotate the low speed screw (L) 
about 1/4 turn clockwise until the...