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3.1 Engine
STIHL single cylinder two-stroke engine with special impregnated cylinder bore
021 023 L 023 025
Displacement:35.2cm
3
40.2cm
3
40.2cm
3
45.4 cm
3
2.15cu.in2.45cu.in2.45cu.in1.8 cu.in
Bore:40mm40mm40mm42m 42,5 mm
1.57in1.57in1.57in1.7 in
Stroke: 28 mm 32 mm 32 mm 32 mm 32 mm
1.10 in 1.26 in 1.26 in 1.26 in
Power output to ISO 7293: 1.5 kW (2.0 bhp) 1.1 kW (1.5 bhp) 1.9 kW (2.6 bhp) 2.2 kW (3.0 bhp)
at 9,000 rpm at 6,500 rpm at 9,500 rpm at 10,000 rpm
Max. permissible engine speed
(with bar and chain): 11,500 rpm
1)
12,500 rpm 13,000 rpm
Idle speed: 2,800 rpm
Bearings: Crankshaft supported in heavy-duty ball bearings, needle cages on
small and big ends
Cylindrical rollers on big end
2)
Piston pin diameter: 10 mm (0.39 in)
Rewind starter: Pawl engagement
Pawls: Single pawl system
Reserve pull on rope rotor: min. 1/2 turn
Starter rope: 3.0 mm (0.12 in) dia.
Clutch: Centrifugal clutch without linings
Clutch engages at: 3,600 rpm 4,100 rpm 3,500 rpm 3,500 rpm
Crankcase leakage
test
at gauge pressure: 0.5 bar (7.25 psi)
under vacuum: 0.5 bar (7.25 psi)
3.2 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: 0.47 l (1 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:Box filter, fabric or fleece filter
1)
Not adjustable
2)
021 only up to serial number X 34 944 402
3. SPECIFICATIONS
021, 023, 025 3
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