32
English / USA
KM 90, KM 90 R
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 four-stroke 
engine with gas-oil lubrication
Displacement:  
1.73 cu.in (28.4 cm
3
)
Bore: 
1.5 in (38 mm)
Stroke: 
0.98 in (25 mm)
Engine power to ISO 8893: 
1.3 bhp (0.95 kW) 
at 7,000 rpm
Idle speed  
2,800 rpm 
Engine cut-off speed 
10,500 rpm 
Valve clearance
Inlet valve: 0.004 in (0.10 mm)
Exhaust valvel: 0.004 in (0.10 mm)
Fuel tank capacity
18.0 fl.oz (0.53 l)
Spark plug (resistor type) 
Bosch USR 7AC 
Electrode gap 0.02 in (0.5 mm)
Weight 
(without tool and deflector) 
KM 90 R 
with loop handle: 9.9 lb (4.5 kg) 
KM 90 
with bike handle:  10.6 lb (4.8 kg) 
Contact your STIHL dealer for 
information regarding special 
accessories that may be available for 
your product.
Specifications Special Accessories