VEB BERLIN SR59, Руководство по эксплуатации

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screw is screwed out by about 2½ rotations. After adjusting, it´s position is to be secured with the
counter nut.
The idle speed is adjusted through a stop screw which can be found on the housing cap. This
screw is also secured with a counter nut. Screwing the stop screw in, reduces the intake opening
that is left open, when the throttle is fully closed reulting in reduced idle speed. Acordingly, the idle
speed is raised, by screweing the stop screw out.
To insure that only clean air gets into the carb, an intake silencer wet air filter is installed before the
intake opening. The wet air filter´s baffle is coated with oil which causes fine dust particles to stick
to the many little filter channels, resulting in throttleling the carburetor and thus reducing power
output of the entire engine. This is why regular cleansing of the wet air filter is essential as well as
re-coating the filter with motoroil, which is mandatory to achieve full effect.
2.182 Cleansing the airfilter
After having removed the three hexagonal nuts from the intake silencer, it´s lid can be removed.
The rubber seating inside the lid (filter seating) holds the wet air filter. It can be pushed out easily
without the use of any tools. Using benzine and a little help of an old clean paintbrush the airfilter is
now to be cleansed thoroughly. (Attention: Never use benzine as fuel )
Afterwards the air filter is coated with a little motor oil. Leave enough time to let excess oil drip off.
When done, press the air filter back into it´s seating and screw the lid back onto the intake silencer,
after also having cleansed it. (The intake silencer is made from aluminum pressure die cast)
To clean the intake silencer, it must be removed from the rubber connection nozzle, which itself is
clamped onto the carburetor socket and can only be removed, once the two tightning screws (wich
carry the fastening angles) on the clutch housing are losened. The intake silencer can be ground
off, although the screws are only losened and don´t need to be entirely unscrewed, because the
fastening angles have trenches embedded.
While refitting the intake silencer, it must be carefully monitored, that the breather rubber of the
alternator is properly embedded into the bottom part of the housing, otherwise the alternators
ventilation is jeopardized.
When driving in snow, ice, sandy or very dusty areas,
the airfilter is to be cleansed more often. A
dirty air filter results in an irregular running engine, smothering exhaust, higher fuel consumption,
and bad performance.
The engine must never be used without air filter, because the carburetor setting is precisely tuned
to the throttleing effect of the air filter. Missing air filter results in a ratio, that is too lean and results
in loss of performance. Also fine particles of dust and sand will get into the engine, corroding the
contact surface of the cylinder and possibly breaking the engine´s bearings. With every airfilter
cleansing (every 1250 miles) one shouldn´t forget to lube the clutch.