Chainsaw User Manual

56
English / USA
MS 290, MS 310, MS 390
Engine
EPA / CEPA:
The Emission Compliance Period
referred to on the Emissions
Compliance Label indicates the number
of operating hours for which the engine
has been shown to meet Federal
emission requirements.
Category:
A = 300 hours,
B = 125 hours,
C = 50 hours
CARB:
The Emission Compliance Period used
on the CARB Air Index Label indicates
the terms:
Extended = 300 hours
Intermediate = 125 hours
Moderate = 50 hours
STIHL single cylinder two-stroke engine
MS 290
MS 310
MS 390
Magneto Ignition System
Electronic (breakerless)
Spark plug (suppressed)
Bosch WSR 6 F, NGK BPMR 7 A,
Electrode gap
0.02 in (0.5 mm)
Fuel / Oil System
Diaphragm carburetor
All position with integral fuel pump
Fuel tank capacity
1.2 US pt (0,56 l)
Fuel mixture
See "Fuel"
Air filter
Prefilter (coarse filter) and bisectional
box filter
Chain lubrication
Fully automatic, speed-controlled rotary
piston oil pump.
Oil tank capacity
0.68 US pt (0,33 l)
Weight
without bar and chain
13 lb (5,9 kg)
Specifications
Displacement 3.45 cu.in (56,5 cm
3
)
Bore 1.81 in (46 mm)
Stroke 1.34 in (34 mm)
Idle speed 2,800 rpm
Displacement 3.60 cu.in (59,0 cm
3
)
Bore 1.85 in (47 mm)
Stroke 1.34 in (34 mm)
Idle speed 2,800 rpm
Displacement 3.90 cu.in (64,1 cm
3
)
Bore 1.93 in (49 mm)
Stroke 1.34 in (34 mm)
Idle speed 2,800 rpm