3.1 Engine STIHL single-cylinder two-stroke engine with special impregnated
cylinder bore
Displacement: 27.2 cm
3
(1.66 cu.in)
Bore: 34mm(1.34in)
Stroke: 30mm(1.18in)
Engine power to ISO 7293: 0.75 kW (1 bhp)
at 7000 rpm
Max. permissible engine speed
without cutting tool
(cut-off speed): 9,500
±
800 rpm
Idle speed: 2,800
±
300 rpm
Bearings: Crankshaft supported in heavy-
duty ball bearings, needle cages
on small and big ends
Piston pin diameter: Ø 8 mm (0.31 in)
Rewind starter: Pawl engagement
Pawls: Single pawl system
Reserve pull on rope rotor: min. 1/2 turn
Starter rope: Ø 3 mm (0.12 in) dia.,
800 mm (31.5 in)
Clutch: Centrifugal clutch without linings
Clutch engages at: 3,800 rpm
Crankcase leakage test
at gauge pressure: pü = 0.5 bar (7.25 psi)
under vacuum: pu = 0.5 bar (7.25 psi)
3.2 Fuel System Carburetor: Diaphragm carburetor
Carburetor leakage test
at gauge pressure: pü = 0.8 bar (11.6 psi)
Operation of tank vent
at gauge pressure: pü
≤
0.3 bar (4.35 psi)
under vacuum: pu
≤
0.05 bar (0.725 psi)
Fuel tank capacity: 0.30 l (0.63 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: Felt element
3. SPECIFICATIONS
FS 45 3
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