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: 50:1with STIHL two-stroke engine oil
25:1with 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
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