Honda SPORTRAX 250EX 2007, Owner'S Manual

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184
Crankcase Emission Control System
Problems That May Affect ATV Exhaust Emissions
Emission Control Systems
Technical Information
The engine is equipped with a closed crankcase system to prevent
discharging crankcase emissions into the atmosphere. Blow-by gas is
returned to the combustion chamber through the air cleaner and the
carburetor.
If you are aware of any of the following symptoms, have the vehicle
inspected and repaired by your Honda ATV dealer.
Symptoms:
Hard starting or stalling after starting
Rough idle
Misfiring or backfiring during acceleration
After-burning (backfiring)
Poor performance (driveability) and poor fuel economy
Federal regulations prohibit removing or disabling a device or element
of design that may affect your engine’s emission performance unless
your ATV will be used exclusively in competition. If you modify your
engine for use in sanctioned competition events, you must deface or
destroy the emission control information label.
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