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18. Emission Control System
18-10
Countermeasure for Emission Pollutants Not Within Standard as In Idle
Speed (4-Stroke Engine)
Note 1: Test it according to the idling test procedure.
Note 2: Adjustment the idle adjustment screw. Set the engine rpm in specified speed, and test CO, HC
at idling. And then adjust the air adjustment screw at the same time to let CO value to be
1.5~4.5%.
Note 3: If the values still can not be reached to specification after adjusted the carburetor, then clean or
replace it with new one according to the procedures.
Conduct periodical inspection
(check one time for 1500 km/6
months)
Test exhaust contents at idling
(note 1)
Adjustment carburetor (note 2)
Clean the carburetor
(SJ, MJ, SAJ, MAJ)
Replace the carburetor
Keep the CO value in
1.5~4.5% (note 3) by adjusting
the carburetor.
Clean the carbon deposit in
cylinder and combustion
chamber.
Check piston rings for seized
or leaking.
Clean or replace the muffler.
Inspect other related
mechanism on the engine
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