Beta RR 390 User Manual

4
ADJUSTMENTS
66
GB
NOTE
Failure to successfully complete the above procedure can be the result of an improp-
erly sized idling jet.
a) If the mixture adjusting screw is turned until it stops and no changes in the idle
speed are observed, a smaller idling jet is required.
b) If the engine stalls when the adjusting screw is still two turns open, a larger idling
jet is needed.
Naturally, after replacing the jet the adjusting procedure will have to be restarted
from the beginning.
•Turn the adjusting knob until you obtain the desired idle speed.
•The idle speed will have to be adjusted again in case of marked changes in the
outside temperature and riding altitude.

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