Service manual

Page 35 of 151
5-8 Adjustment of Idle Speed
Caution
The air screw is factory set, so no adjustment is
needed. Note the number of turns it takes to
screw it all the way in.
Use the parking brake to park the ATV before
making adjustments.
• Use a tachometer when adjusting engine
RPM.
• Screw in the air adjustment screw gently, then
back out to reach the standard.
• Standard turns: 1 ½ turns out
• Warm up the engine.
• Adjust the throttle stopper screw on the
throttle valve to reach standard RPM.
• Idle speed rpm: 1700 ± 100 rpm
• Connect an exhaust analyzer hose to the
exhaust front end. Press the test key on the
analyzer.
• Adjust the pilot screw and read CO reading
on the analyzer.
• CO standard value: 1.0-1.5%
• Accelerate in small increments.
• Ensure the RPM and CO values remain
standard after the engine returns to idle.
• If the RPM or CO values fluctuated, repeat
the procedures described above for
adjusting to standard value.
Air Mixture Screw
Idle Ad
j
ustment Screw
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