Instruction Manual

–
Starter mechanism
–
Spark plug
–
Components of antivibration system
31 Main Parts
4
8
21
10
15
16
1
1
#
13
2310BA029 ST
17
7
14
11
12
6
9
3
1
23
24
22
19
20
18
5
7
25
26
2
1 Shroud lock
2 Carburetor adjusting screws
3
Fuel pump
1)
4 Shutter (summer and winter operation)
5 Chain brake
6 Chain sprocket
7 Chain sprocket cover
8 Chain catcher
9
Side chain tensioner
1)
10 Spiked bumper
11 Guide bar
12 Oilomatic chain
13
Adjusting wheel
1)
(quick chain adjuster)
14
Handle of wingnut
1)
(quick chain adjuster)
15 Oil filler cap
16 Muffler
17 Front hand guard
18 Front handle (handlebar)
19 Spark plug boot
20 Starter grip
21 Fuel filler cap
22 Master Control lever
23 Throttle trigger
24 Throttle trigger lockout
25 Rear handle
26 Rear hand guard
# Serial number
32 Specifications
32.1 Engine
STIHL single cylinder two-stroke engine
32.1.1 MS 231, MS 231 C
Displacement:
42.6 cc
Bore: 42.5 mm
Stroke: 30 mm
Engine power to ISO 7293: 2.0 kW (2.7 bhp) at
10,000 rpm
Idle speed:
1)
2,800 rpm
32.1.2 MS 251, MS 251 C
Displacement:
45.6 cc
Bore: 44 mm
Stroke: 30 mm
Engine power to ISO 7293: 2.2 kW (3.0 bhp) at
10,000 rpm
Idle speed:
1)
2,800 rpm
32.2 Ignition System
Electronic magneto ignition
Spark plug (resistor
type):
NGK CMR6H,
BOSCH USR 4 AC
Electrode gap: 0.5 mm
32.3 Fuel System
All position diaphragm carburetor with integral
fuel pump
Fuel tank capacity:
390 cc (0.39 l)
32.4 Chain Lubrication
Fully automatic, speed-controlled oil pump with
rotary piston
1)
Depending on model
1)
to ISO 11681 +/- 50 rpm
English 31 Main Parts
40 0458-737-0121-C