2.1
Engine
STIHL single cylinder two-stroke engine with special impregnated cylinder bore
FS 120/300
FS 200/350
FS 400
FS 450
FR 350
FR 450
Displacement:
30.8 cm
3
36.3 cm
3
40.2 cm
3
44.3 cm
3
1.88 cu.in
2.21 cu.in
2.45 cu.in
2.70 cu.in
Bore:
35 mm
38 mm
40.0 mm
42.0 mm
1.38 in
1.49 in
1.57 in
1.65 in
Stroke:
32 mm
32 mm
32 mm
32 mm
1.26 in
1.26 in
1.26 in
1.26 in
Power output:
1.3 kW (1.8 bhp)
1.6 kW (2.2 bhp)
1.9 kW (2.6 bhp)
2.1 kW (2.8 bhp)
at 9,000 rpm
Max. permissible engine speed
without cutting tool
(cut-off speed):
12,500
±
1000 rpm
12,500
±
800 rpm
Idle speed:
2,800 rpm
Bearings:
Crankshaft supported in heavy-duty ball bearings, needle cages on
small and big ends
Piston pin diameter:
10 mm (0.39 in)
Rewind starter:
ElastoStart
Pawls: Single
pawl
system
Reserve pull on rope rotor:
min. 1/2 turn
Starter rope:
3.0 mm (0.12 in) dia. x 800 mm (31.5 in)
Clutch:
Centrifugal clutch without linings
Clutch engages at:
4,300 rpm
Crankcase leakage
test
at gauge pressure:
0.5 bar (7.25 psi)
under vacuum:
0.5 bar (7.25 psi)
2.2
Fuel System
Carburetor:
Diaphragm carburetor
Standard setting on carburetors
with three adjusting screws
High speed screw H:
Open approx. 1 turn
Low speed screw L:
Open approx. 1 turn
Carburetor leakage test
at gauge pressure:
0.8 bar (11.6 psi)
Function of tank vent
at gauge pressure:
≤
0.3 bar (4.35 psi)
under vacuum:
≤
0.05 bar (0.725 psi)
Fuel tank capacity:
0.64 l (1.35 US pt)
0.68 l (1.44 US pt)
Octane rating:
min. 90 RON (US/CAN; pump octane min. 87)
Fuel mixture:
Regular brand name gasoline
and two-stroke engine oil
Mix ratio:
50:1 with STIHL two-stroke engine oil
25:1 with other brand name two-stroke, air-cooled engine oils
Air filter:
Paper filter
2.
SPECIFICATIONS
FS 120, 200, 300, 350, 400, 450, FR 350, 450
3
Summary of Contents for FS 350
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