Carburetor Idle Speed Adjustment - TGB 525 Service Manual

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 is being warm up. (It is
enough that operates engine from stop to
running for 10 minutes.)
Park the ATV with onto neutral 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.
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
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Repeat this for 2~3
CO: below 2.5~3.5%
HC: below 2000ppm
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2. MAINTENANCE INFORMATION
Air adjustment screw
Carburetor undersurface
Ignition cable
Stopper screw
2-5