Stihl MS 311 User Manual - Page 6
Specifications, Engine, Fuel System, Ignition System, Chain Lubrication - oil adjustment
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2. Specifications 2.1 Engine Displacement: Bore: Stroke: Engine power to ISO 7293: Maximum permissible engine speed with guide bar and chain: Idle speed: Clutch: Clutch engages at: Engine housing leakage test at gauge pressure: under vacuum: 2.2 Fuel System 2.3 Ignition System 2.4 Chain Lubrication MS 311, MS 391 MS 311 59 cm3 47 mm 34 mm 3 kW (4 bhp) at 9,500 rpm 13,000 rpm 2,800 rpm Centrifugal clutch without linings 3,500 rpm 0.5 bar 0.5 bar MS 391 64.1 cm3 49 mm 34 mm 3.2 kW (4.4 bhp) at 9,500 rpm 13,000 rpm 2,800 rpm Centrifugal clutch without linings 3,500 rpm Carburetor leakage test at gauge pressure: Operation of tank vent at gauge pressure: Fuel: 0.8 bar 0.5 bar as specified in instruction manual Air gap between ignition module and fanwheel: Spark plug (resistor type): Electrode gap: 0.20...0.30 mm NGK BPMR 7 A BOSCH WSR6F 0.5 mm Speed-controlled oil pump with reciprocating piston and manual flow control Oil delivery rate: Ematic oil pump 11.5 (+2.5) cm3/min at 10,000 rpm Oil delivery rate: Adjustable oil pump 6.0 (+/-2.0)...17.5 (+3.0 / -4.5) cm3/min at 10,000 rpm 5