Beta RR 390 User Manual

3
CHECKS AND MAINTENANCE
50
GB
Measure the spark gap with a thickness
gauge. The gap should be 0.8÷0.9 mm.
If the gap is not as specified, restore the
proper gap by bending the earth elec-
trode.
Check that the insulator is not cracked
and that the electrodes are not corroded,
in which case the spark plug should be
immediately replaced.
Conduct the check by referring to the table
on page 56.
Lubricate the spark plug thread, and then
(when the engine is cold) screw in the spark
plug by hand to its abutting end. Finally
tighten the spark plug with the spanner.
Note:
- Always use NGK LKAR 8A-9 spark plugs.

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