STIHL BG 86 Instruction Manual download pdf (Page 21)

BG 56, BG 56 C, BG 66, BG 86, BG 86 C, SH 56, SH 56 C, SH 86, SH 86 C

English

N Check the air filter and clean it if

necessary.

N Warm up the engine.

At high altitude

N Turn high speed screw (H)

clockwise (leaner) – no further than

stop.

At sea level

N Turn high speed screw (H) slightly

counterclockwise (richer) – no

further than stop.

Adjusting Idle Speed

It is usually necessary to change the

setting of the idle speed screw (LA) after

every correction to the low speed

screw (L).

Engine stops while idling

N Check the standard setting.

N Turn the idle speed screw (LA)

clockwise until the engine runs

smoothly.

Erratic idling behavior

If acceleration is poor even though the

standard setting is correct, the idle

setting is too rich:

N Turn the low speed screw (L) slowly

clockwise until the engine runs and

accelerates smoothly.

If acceleration is good, the idle setting is

too lean:

N Turn the low speed screw (L) slowly

counterclockwise until the engine

runs and accelerates smoothly.

Wrong fuel mix (too much engine oil in

the gasoline), a dirty air filter and

unfavorable running conditions (mostly

at part throttle etc.) affect the condition

of the spark plug. These factors cause

deposits to form on the insulator nose

which may result in trouble in operation.

If engine is down on power, difficult to

start or runs poorly at idling speed, first

check the spark plug.

N Remove spark plug as described in

chapter "Starting / Stopping the

Engine".

N Clean dirty spark plug.

N Check the electrode gap (A) and

readjust if necessary – see

"Specifications".

N Use only resistor type spark plugs of

the approved range.

295BA077 KN

Checking the Spark Plug

000BA002 KN

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STIHL BG 86 Instruction Manual Page 21

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