Page 53 - 2019 SHOP MANUAL CRF1000/A/D
P. 53

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                                                                                         GENERAL INFORMATION
               EMISSION CONTROL SYSTEMS

               SOURCE OF EMISSIONS
               The  combustion  process  produces carbon monoxide (CO), oxides  of nitrogen (NOx) and hydrocarbons (HC). The  control of
               hydrocarbons and oxides of nitrogen is very important because, under certain conditions, they react to form photochemical smog
               when subject to sunlight. Carbon monoxide does not react in the same way, but it is toxic. Uncontrolled fuel evaporation also
               releases hydrocarbons to the atmosphere.
               Honda Motor Co., Ltd. utilizes various system to reduce carbon monoxide, hydrocarbons, and oxides of nitrogen.
               CRANKCASE EMISSION CONTROL SYSTEM

               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 throttle body.




                                                                                  AIR CLEANER HOUSING







                                                                                        THROTTLE BODY



























                                             FRESH AIR

                                             BLOW-BY GAS























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