High Altitude Carburetor Adjustment - Honda CR250R Owner's Manual & Competition Handbook

High Altitude Carburetor Adjustment

When operating this motorcycle at high altitude,
the air-fuel mixture becomes overly rich.
Above 6,500 feet (2,000 m), driveability and
performance may be reduced and fuel
consumption increased. The carburetor can be
modified to compensate for this high altitude
richness.
However, the carburetor must be returned to
standard factory specifications when lower
altitude riding is desired. See your Honda dealer
for high altitude modification.
NOTICE
Sustained operation at altitudes below 5,000 feet
(1,500 m) with high altitude carburetor
modifications may cause engine overheating and
damage.
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Technical Information