Manual Solo 640 (page 24 of 72) (English, German, Dutch, French, Italian, Spanish)

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Air Filter Cleaning (fig. 50 + 45)

Clogged air & pre-filters cause performance loss and increased

fuel consumption. This leads to a higher toxin level in the exhaust

gas and also makes starting more difficult.

After cutting all day, clean both pre-filter and main filter daily.

In severe dust conditions clean more often. Simply tapping the

filter against an object is the best method of cleaning. If the

filters are heavily soiled, wash them in non-flammable cleaning

solvents (warm soapy water). Both filters should be completely

dry before re-installing. Replace damaged filters. Warranty claims

cannot be accepted for damaged engine parts caused by

improper care and maintenance. For removal and installation,

remove cover (fig.50), close choke to prevent dirt entering the

carburetor and remove filter. Ensure the filter is re-fitted properly

in its correct position. Periodically remove dirt and dust from the

air intake area (fig. 50A). If required, this should be done daily.

CARBURETTOR ADJUSTEMENT

The carburettor is adjusted at the factory for optimum performance.

Subject to location (mountains, plains), the carburettor may need to

be adjusted.

The carburettor is equipped with 3 setting screws:

• Idle end stop, screw „T“ (Pos.16)

• Idle mixture, screw „L“ (Pos.17)

• Full load mixture, screw „H“ (Pos.17)

The regulating screws for idle mixture (L) and full

load mixture (H) must only be adjusted by

qualified mechanics.

Minor adjustments of the idle setting to the average idle

speed stated in the specification can be made via the idle end

stop screw (T) using a tachometer as follows:

- Turn the idle end stop screw (T) a little anticlockwise, if the

idle speed is too high.

- Turn the idle end-stop screw (T) a little clockwise, until the

motor runs smoothly, if the idle speed is too low (in other

words if the engine refuses to start or stalls).

Under no circumstances must the chaine driven at

idle speed.

Ask an authorised service shop to adjust your machine, if you

cannot obtain an optimum carburettor adjustment by

correcting the idle end stop screw „T“.

The following instructions are for authorised service shops:

Using the D-CUT carburettor:

key (SOLO part no: 00 80 537) to correct settings on the idle

mixture screw (L) and on the full load screw (H).

Using the carburettor with limitercaps:

The regulating screws for idle mix and full charge mix can only

be adjusted in a limited range.

The air filter must be clean to achieve the correct idle

adjustment. Let the engine run until it is warm, before making

any adjustments. Maintain the values regarding the average

idle speed and maximum permissible speed stated under

“Specification”.

Please note: The carburettor is adjusted to

achieve maximum engine power. Always use a

tachometer to carry out this adjustment.

ANTI-VIBRATION SYSTEM (fig. 47)

Should the vibration level suddenly increase, especially when

compared with the level when the saw was new, immediately

check all anti-vibration mounts for damage and replace if

required.

Caution! Operating a chain saw with damaged anti-

vibration system will endanger your health!

CHAIN SPROCKET AND CLUTCH (fig. 48)

Always inspect the condition of the chain sprocket before fitting

a new replacement chain. Worn sprockets will damage a new

saw chain. The sprocket bearing in particular is subject to high

stress and should be lubricated regularly with a high quality

bearing grease, such as Mobiltemp 78 for example. (See also

maintenance chart).

REPLACEMENT OF SPROCKET AND CLUTCH ASSEMBLY

The following notes are intended for use by Service Centers!

The clutch assembly is threaded to the crankshaft.

Caution, left hand thread! Turn clockwise to remove clutch.

Ensure proper installation sequence is followed. Some special

tools are required to replace clutch drum and chain sprocket.

MUFFLER MAINTENANCE

A damaged muffler is a fire hazard and can also lead to hearing

problems. Regularly check muffler condition and muffler

retaining bolts.

CAUTION!

Never touch hot exhaust!

SPARK PLUG REPLACEMENT

CAUTION!Do not touch spark plug or spark plug cap

while engine is running. (high voltage)

Service work should only be performed with switched off engine.

Avoid burns while engine is hot. Wear protective gloves!

Ignition problems which are not solved with a change of spark

plug and/or plug cap should be referred to an authorized service

center or specialized dealer.

Notes on Spark Plug: (fig. 49)

Thermal range = 200

Electrode gap = 0.5 mm (.020”)

Checking of the ignition system should start with the spark plug.

Checking for ignition spark

- Use an insulated pair of pliers, hold spark plug in plug cap

against the cylinder but not near plug opening.

– Move ignition stop switch to ‘I’.

- Pull starter rope firmly.

If the ignition system is in good condition, a visible spark should

arc across the electrodes of the plug.

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Solo 640 Manual

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