STIHL MS 250 Definitions, Chain Brake, Muffler, Chain Sprocket Cover, Chain Catcher, Clutch

Definitions

1Carburetor Box Cover Twist Lock Lock for carburetor box cover.

2Carburetor Adjusting Screws For tuning the carburetor.

3Manual Fuel Pump

Provides additional fuel feed for a cold start.

4Decompression Valve (Automatically Resetting)

Releases compression pressure to make engine starting easier – when activated.

5Chain Brake

A device to stop the rotation of the chain. Is activated in a kickback situation by the operator's hand or by inertia.

6Muffler

Reduces engine exhaust noises and diverts exhaust gases away from operator.

7Chain Sprocket

The toothed wheel that drives the saw chain.

8Chain Sprocket Cover

Covers the clutch and chain sprocket.

9Chain Catcher

Helps to reduce the risk of operator contact by a chain when it breaks or comes off the bar.

10Chain Tensioner

Permits precise adjustment of chain tension.

11Guide Bar

Supports and guides the saw chain.

12Oilomatic Saw Chain

A loop consisting of cutters, tie straps and drive links.

13Oil Filler Cap

For closing the oil tank.

14Bumper Spike

Toothed stop for holding saw steady against wood.

15Front Hand Guard

Provides protection against projecting branches and helps prevent left hand from touching the chain if it slips off the handlebar. It also serves as the lever for chain brake activation.

16Front Handle (Handlebar)

Handlebar for the left hand at the front of the saw.

17Starter Grip

The grip of the pull starter, for starting the engine.

18Spark Plug Boot

Connects the spark plug with the ignition lead.

19Master Control Lever

Lever for starting, operating and stop-engine positions.

20Fuel Filler Cap

For closing the fuel tank.

21Throttle Trigger

Controls the speed of the engine.

22Throttle Trigger Lockout

Must be depressed before the throttle trigger can be activated.

English

23Rear Handle

The support handle for the right hand, located at the rear of the saw.

24Rear Hand Guard

Gives added protection to operator's right hand.

Guide Bar Nose

The exposed end of the guide bar. (not illustrated, see chapter "Tensioning the Saw Chain")

Clutch

Couples engine to chain sprocket when engine is accelerated beyond idle speed. (not illustrated)

Anti-Vibration System

The anti-vibration system includes a number of anti-vibration elements designed to reduce the transmission of vibrations created by the engine and cutting attachment to the operator's hands. (not illustrated)

MS 250 53