Stihl Ms 270 C Owners Manual

40 English / USAMS 270, MS 270 C, MS 280, MS 280 CIf the engine doesn’t start:If you did not move the Master Control 
lever to “Warm Start” n quickly enough 
after the engine began to fire, the 
combustion chamber has flooded.
: Loosen knob ( 1) in direction of 
arrow.
: Remove the carburetor box 
cover ( 2).
: Pull off the spark plug boot ( 3). :
Unscrew and dry off the spark plug.
: Set the Master Control lever to 
“Stop” position 
0
:Press down the interlock lever, open 
the throttle wide and, at the...

41
MS 270, MS 270 C, MS 280, MS 280 C English / USA
During operationCheck chain tension frequently
A new chain has to be retensioned more 
often than one that has been in use for 
some time.
Chain cold: 
Tension is correct when chain fits snugly 
against the underside of the bar and can 
still be pulled along the bar by hand.
Retension if necessary – see 
“Tensioning the Saw Chain”.
Chain at operating temperature: 
The chain stretches and begins to sag. 
The drive links must not come out of the 
bar...

42 English / USAMS 270, MS 270 C, MS 280, MS 280 C
If groove depth is less than specified:
:
Replace the guide bar.
The drive link tangs will otherwise 
scrape along the bottom of the groove  –  
the cutters and tie straps will not ride on 
the bar rails. The air filter system can be adapted to 
suit different operating conditions by 
simply installing a choice of filters.
Fabric filter*For normal operating conditions and 
winter operation.Fleece filter (non-woven)*For dry and very dusty work areas.
*...

43
MS 270, MS 270 C, MS 280, MS 280 C English / USA
: Locate the filter ( 3) in position (see 
arrows).
: Fit the carburetor box cover. Exhaust emissions are controlled by the 
design of the fundamental engine 
parameters and components (e.g. 
carburation, ignition, timing and valve or 
port timing) without the addition of any 
major hardware.
Your chainsaw is equipped with one of 
the following carburetors: 
–
Intelligent Engine Management  – 
Carburetor without high speed 
screw (H). Full load range...

44 English / USAMS 270, MS 270 C, MS 280, MS 280 CStandard Setting:Shut off the engine.
: Check the air filter and clean or 
replace if necessary.
: Check spark arresting screen* in the 
muffler and clean or replace it as 
necessary.
Turn low speed screw  (L) clockwise as 
far as stop. Then back it off one quarter 
turn.
Only machines with high speed 
screw (H)
Turn the high speed screw  (H) 
counterclockwise (max. 
3/4 turn) as far 
as stop.
* See Guide to Using this Manual
Adjusting Idle SpeedEngine...

45
MS 270, MS 270 C, MS 280, MS 280 C English / USA
Only machines with high speed 
screw (H)
Operation at High AltitudeA slight correction of the setting 
may be 
necessary if engine power is not 
satisfactory:
: Check the standard setting. 
: Warm up the engine. 
: Turn high speed screw ( H) slightly 
clockwise (leaner) – no further than 
stop.
If the  setting is too lean  there is 
a  risk of engine damage  due to 
insufficient lubrication and 
overheating. Machines with Intelligent Engine...

46 English / USAMS 270, MS 270 C, MS 280, MS 280 C
Wrong fuel mix (too much engine oil in 
the gasoline), a dirty air filter and 
unfavorable running conditions (mostly 
at part throttle etc.) affect the condition of 
the spark plug. These factors cause 
deposits to form on the insulator nose 
which may result in trouble in operation. If engine is down on power, difficult to 
start or runs poorly at idling speed, first 
check the spark plug.
:
Remove spark plug – see Starting / 
Stopping the Engine.
:...

47
MS 270, MS 270 C, MS 280, MS 280 C English / USA
: Remove the screws ( 1). 
: Push the hand guard upward.
: Pull the underside of the fan cover 
away from the fan housing and 
remove it downward.
: Use a screwdriver or suitable pliers 
to remove the spring clip ( 2) from 
the starter post.
: Carefully  remove the rope rotor 
with washer ( 3) and pawls ( 4) – do 
not pull the rewind spring out of the 
housing – take care to avoid injury.
Starter Grip without ElastoStart: Use a screwdriver to pry the...

48 English / USAMS 270, MS 270 C, MS 280, MS 280 CAll Versions:Thread the rope through the top of 
the guide bushing ( 6), pull it through 
the rotor ( 7) and secure it with a 
simple overhand knot. 
: Coat rope rotor bearing bore with 
resin-free oil.
: Slip rotor over the starter post ( 8) – 
turn it back and forth to engage 
anchor loop of the rewind spring. :
Fit the pawls ( 4) in the rope rotor.
: Fit the washer ( 3) on the starter 
post.
: Use a screwdriver or suitable pliers 
to install the...

49
MS 270, MS 270 C, MS 280, MS 280 C English / USA
Replacing a Broken Rewind 
Spring:
Remove the rope rotor. 
The bits of spring might still be 
under tension and could fly apart 
when you take them out of the fan 
cover. To reduce risk of injury, wear 
eye and face protection and work 
gloves.
: Use a screwdriver to carefully 
remove the parts of the spring.
: Lubricate the new spring with a few 
drops of non-resinous oil. :
Place the replacement spring with 
frame in the fan cover – the spring 
loop...