Stihl MS 650 Specifications

Stihl MS 650 Chainsaw Specifications

Stihl MS 650 Specifications for Stihl MS650 chainsaws, Find detailed specs information for the Stihl chainsaw including engine, fuel ignition system and cutting attachments.

Stihl MS 650 Specifications

MS 650 Chainsaw Engine: STIHL single-cylinder two-stroke engine with special impregnated cylinder bore.

Replace carburetor with the following Walbro or Zama carbs:

Walbro Carburetor Models: WT-215, WT-283C (United States), WT-286A (Easy Start), WT-498A (Easy Start) ,WT-503-1,WT-360 (023L), WT-396 (023L).

Zama Carburetor Models: C1Q-S11-C, C1Q-S11-D , C1Q-S11-E, C1Q-S11-G

Displacement: 5.2 cu. in. (84.9 cm3)
Bore: 2.05 in. (52 mm)
Stroke: 1.57 in. (40 mm)
Power output to ISO 7293: 6.4 hp (4.8 kW) at 9,500 rpm
Max. permissible engine speed (with bar and chain): 13,500 rpm
Idle speed: 2,500 rpm
Clutch engages at: 3,000 rpm
Crankcase leakage test:
at gauge pressure: 0.5 bar
under vacuum: 0.5 bar (7.25 psi)

Stihl MS650 Specifications Fuel System

Carburetor: Diaphragm carburetor
Standard setting on carburetors with three adjusting screws
High speed screw H: Open approx. 1 turn
Low speed screw L: Open approx. 1 turn
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: 0.47 l (1 US pt)
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
Air filter:Box filter, fabric or fleece filter

Stihl MS650 Specifications Ignition System

Type: Electronic magneto ignition (breakerless) with integral trigger unit
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)

Cutting Attachments

Rollomatic E guide bars-STIHL reduced kickback guide bars (with green label)
Bar 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)
Sprocket nose: 10-tooth

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

Chain lubrication

Fully automatic, speed-controlled oil pump with reciprocating 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

Stihl MS650 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 650 Specifications.

More Stihl MS 650 Specifications information can be found in Carburetor Manuals HERE and a Stihl MS650 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.

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