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Maintenance
Carburetor Idle Speed Adjustment:
CAUTIoN
• Inspection & adjustment for idle speed must be performed after all parts in the engine that needed adjustment
have been adjusted.
• Idle speed check and adjustment have to be done after engine is warmed up. (Run engine for 10 minutes.)
Park the MTV in neutral and warm up the engine.
Turn the throttle valve stopper screw to specified idle speed.
Specified idle speed: 1500rpm (+/- 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 (Shown with Arrow) so that emission value in idle speed is within standard.
4. Slightly accelerate the throttle valve and release it immediately. Repeat this 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 2.5~3.5% HC: below 2000ppm
Summary of Contents for 1500
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