Beta RR 400, Operating Instructions Manual, Page: 126 / 392

3
CHECKS AND MAINTENANCE
48
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 wheel 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.
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).