Beta RR 390 User Manual

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CHECKS AND MAINTENANCE
51
GB
CARBURETTOR
CARBURETTOR WEAR GUIDELINES
The throttle valve, the needle valve and the needle jet are subject to heavy wear
due to engine vibrations.
This can result in carburettor malfunctions (e.g. mixture enrichment).
DRAINING THE CARBURETTOR
FLOAT CHAMBER
The carburettor float chamber can be
drained by following the procedure de-
scribed below while the engine is cold.
Close the fuel cock and place tube 4 in a
container to gather the fuel that flows out.
Open drain screw 5 and drain the fuel.
Close the drain screw, open the fuel cock
and check the seal of the system.
WARNING
Fuel is flammable and toxic and must be handled with great care. Never work on
the fuel system near heat sources or open flames. Always allow the engine to cool
down before working on the fuel system. Wipe off any excess fuel with a rag. Materi-
als soaked in fuel are also flammable. In case of ingestion or contact with sensitive
parts of the body immediately seek medical attention. Fuel is to be disposed of as
prescribed by law.
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4

Beta RR 390 Specifications

General

Displacement	386 cc
Bore x Stroke	88 mm x 63.4 mm
Compression Ratio	12.5:1
Fuel System	Electronic Fuel Injection
Ignition	DC-CDI
Lubrication	Wet sump
Transmission	6-speed
Clutch	Wet multi-disc
Front Tire	90/90-21
Rear Tire	140/80-18
Ground Clearance	320 mm
Dry Weight	107 kg
Engine Type	Single cylinder, 4-stroke, liquid-cooled
Frame	Molybdenum steel with double cradle split above the exhaust port
Rear Suspension	Monoshock