Stihl MS 290 STIHL FARM BOSS Product Instruction Manual - Page 57

English / USA Specifications 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 Displacement Bore Stroke Idle speed 3.45 cu.in (56,5 cm3) 1.81 in (46 mm) 1.34 in (34 mm) 2,800 rpm MS 310 Displacement Bore Stroke Idle speed 3.60 cu.in (59,0 cm3) 1.85 in (47 mm) 1.34 in (34 mm) 2,800 rpm MS 390 Displacement Bore Stroke Idle speed 3.90 cu.in (64,1 cm3) 1.93 in (49 mm) 1.34 in (34 mm) 2,800 rpm 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) 56 MS 290, MS 310, MS 390