Stihl MS 660 Chainsaw Specifications
Stihl MS 660 Specifications for Stihl MS660 chainsaws, Find detailed specs information for the Stihl chainsaw including engine, fuel ignition system and cutting attachments.
Stihl MS 660 Specifications
MS 660 Chainsaw Engine: STIHL single-cylinder two-stroke engine with special impregnated cylinder bore.
Replace carburetor with the following Walbro carbs:
Walbro Carburetor Models:
WJ-67 (MS660, MS660W and MS660 Magnum) , WJ-69 (MS660 Arctic and MS660 Magnum R) , WJ-76 (MS660 Magnum BR).
MS660 Engine
Displacement: 5.6 cu. in. (91.6 cm3)
Bore: 2.13 in. (54 mm)
Stroke: 1.57 in. (40 mm)
Power output to ISO 7293: 7.0 hp (5.2 kW) bei 9,500 rpm
Max. permissible engine speed (with bar and chain): 13,500 rpm (carburetor with limiter caps). 13,000 rpm (carburetor without limiter caps)
Idle speed: 2,500 rpm
Clutch: Centrifugal clutch without linings
Clutch engages at: 3,000 rpm
Crankcase leakage test:
at gauge pressure: 0.5 bar
under vacuum: 0.5 bar (7.25 psi)
Stihl MS660 Specifications Fuel System
Carburetor: All position diaphragm carburetor with integral fuel pump
Carburetor leakage test at gauge pressure: 0.8 bar (11.6 psi)
Function of tank vent at gauge pressure: (±) 0.3 bar (4.35 psi)
under vacuum: (±) 0.05 bar (0.725 psi)
Fuel tank capacity: 27.9 fl.oz (0.825 l)
Octane rating: min. 90 RON (US/CAN; pump octane min. 87)
Fuel mixture: Regular brand name gasoline and two-stroke engine oil
Mix ratio: 50:1 with STIHL two-stroke engine oil, 25:1 with other brand name two-stroke, air-cooled engine oils
Stihl MS660 Specifications Ignition System
Type: Electronic (breakerless) magneto ignition
Air gap: 0.15 – 0.3 mm
Spark plug (suppressed): Bosch WSR 6F, NGK BPMR 7 A, Champion RCJ 6Y or Autolite 298
Electrode gap: 0.5 mm (0.020 in)
Chain lubrication
Fully automatic, speed-controlled oil pump with rotary piston. Additional manual oil flow control.
Oil tank capacity: 12.2 fl.oz (0.36 l)
Oil delivery rate: 5.5 – 15 cm3 at 10,000 rpm
Cutting Attachments
Rollomatic E guide bars
Reduced kickback STIHL guide bar (with green label)
Cutting lengths: 20, 25, 28, 32 or 36 in (50, 63, 70, 80 or 90 cm)
Pitch: 3/8″ (9.32 mm)
Groove width: 0.050 in (1.3 mm)
Nose sprocket: 10-tooth
Reduced kickback STIHL guide bar (with green label)
Cutting lengths: 20, 22, 25, 28, 32 or 36 in (50, 55, 63, 70, 80 or 90 cm)
Pitch: 3/8″ (9.32 mm)
Groove width: 0.063 in (1.6 mm)
Nose sprocket: 10-tooth
3/8″ chains
Low kickback STIHL saw chain (with green label)
Rapid Super 3 (33 RS3) Type 3624
Pitch: 3/8″ (9.32 mm)
Drive link gauge: 0.050 in (1.3 mm)
Low kickback STIHL saw chain (with green label)
Rapid Super 3 (36 RS3) Type 3626
Pitch: 3/8″ (9.32 mm)
Drive link gauge: 0.063 in (1.6 mm)
Chain sprocket
7-tooth for 3/8″ (rim sprocket)
STIHL reduced kickback guide bars (with green label)
Bar lengths: 20, 22, 25, 28, 32 or 36 in. (50, 55, 63, 70, 80 or 90 cm)
Pitch: 3/8″ (9.32 mm)
Groove width: 0.063 in. (1.6 mm)
Sprocket nose: 10-tooth
Stihl MS660 Specifications Tightening Torques
DG screws are used in the polymer and light-alloy components. These screws form a permanent thread when they are installed for the first time. They can be removed and installed as often as necessary without detrimentally affecting the strength of the screwed assembly, providing the specified tightening torque is observed. For this reason it is essential to use a torque wrench when making adjustments from the Stihl MS 660 Specifications.
More Stihl MS 660 Specifications information can be found in Carburetor Manuals HERE and a Stihl MS660 chainsaw workshop manual HERE. Stihl Parts list HERE a chainsaw search (magnifier icon) at top and bottom of this page, as well as a chainsaw repair help question and answer page HERE.