HER CHEE ATV-600 Service Manual page 25

Ch. 2 MAINTENANCE INFORMATION
Carburetor Idle Speed Adjustment
Caution
 Inspection & adjustment for idle speed have to
be performed after all parts in engine that
needed adjustment have been adjusted.
 Idle speed check and adjustment have to be
done after engine being warmed up. (It is
enough that operates engine from stop to
running for 10 minutes.)
Park the ATV and warm up engine.
Connect tachometer (the wire clamp of
tachometer is connected to the high tension
cable).
Turn the throttle valve stopper screw to specified
idle speed.
Specified idle speed: 1500 ± 100 rpm
Emission adjustment in idle speed
Warm up the engine for around 10 minutes and
then conduct this adjustment.
1. Connect the tachometer onto engine.
2. Adjust the throttle valve stopper screw and let
engine runs in 1500 ±100 rpm.
3. Insert the exhaust sampling pipe of exhaust
analyzer into the front section of exhaust pipe.
Adjust the air adjustment screw so that
emission value in idle speed is within
standard.
4. Slightly accelerate the throttle valve and
release it immediately. Repeat this for 2~3
times.
5. Read engine RPM and value on the exhaust
analyzer. Repeat step 2 to step 4 procedures
until measured value within standard.
Emission standard CO: below 0,8~1.5%
HC: below 900ppm
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