4
Series 4141 Powerhead
3
Specifications
3.1
Engine
STIHL single cylinder two-stroke engine
Displacement:
Bore:
Stroke:
Engine power to ISO 8893:
at 9,250 rpm
Max. permissible engine speed
without cutting tool
- without cut-off
- with cut-off in ignition module
Idle speed:
Bearings:
Piston pin diameter:
Clutch:
Clutch engages at:
Crankcase leakage test
at gauge pressure:
under vacuum:
25.4 cm
3
(1.55 cu.in)
34 mm (1.34 in)
28 mm (1.10 in)
0.9 kW (1.2 bhp)
12,900 ± 800
rpm
10,500 ± 500 rpm
3,000 rpm
Crankshaft supported in heavy-duty
deep-groove ball bearings, needle
cages on small and big ends
8 mm (0.315 in)
Centrifugal clutch with linings
4,100 ± 200 rpm
0.5 bar (7.25 psi)
0.5 bar (7.25 psi)
3.2
Ignition System
Type:
Air gap:
Spark plug:
Electrode gap:
Transistorized magneto ignition
(breakerless) with integral
trigger unit
0.25 mm (0.010 in)
NGK CMR 7A
0.5 mm (0.020 in)
3.3
Fuel System
Carburetor:
Idle setting:
Carburetor leakage test:
at gauge pressure
Fuel tank capacity:
Octane number:
Fuel mixture:
Mix ratio:
Air filter
Rotary valve carburetor
Open about 6 turns
(standard setting)
0.8 bar (11.6 psi)
700 cm
3
(23.7 fl.oz)
min. 90 RON (USA/CAN: pump
octane min. 87 unleaded)
Regular brand-name gasoline
and brand-name two-stroke engine
oil
50:1 with STIHL two-stroke engine
oil
Foam element and prefilter (wire
mesh)
Summary of Contents for 4141 Series
Page 1: ......
Page 43: ...42 Series 4141 Powerhead ...
