High Co At Idle Speed; Backfiring At Sudden Deceleration; Exhaust Muffler Noise; Air Injection Cut-Off Valve (A.i.c.v.) - KYMCO SUPER8 50 2T Service Manual

17
. EXHAUST EMISSION CONTROL
SYSTEM
TROUBLESHOOTING

High CO at idle speed

1. Damaged or clogged reed valve
2. Damaged or clogged air injection cut-off valve
3. Clogged air cleaner

Backfiring at sudden deceleration

1. Damaged reed valve (malfunction)
2. Faulty air injection cut-off valve (unable to close)
3. Carburetor incorrectly adjusted
4. Faulty air cut-off valve
5. Leaking vacuum tube

Exhaust muffler noise

1. Faulty air injection cut-off valve
2. Broken vacuum tube
3. Faulty reed valve
SERVICE INFORMATION
GENERAL INSTRUCTIONS
• During operation, be careful to avoid scalding caused by the exhaust muffler.
• Note the locations of tubes for proper installation.
• Replace any damaged tube with a new one.
• Make sure to tighten the connector of each tube securely
TOOLS
• Vacuum pump
SPECIFICATIONS
Air injection cut-off valve actuating pressure－
250mm/Hg－30 liter/min.
Reed valve stopper clearance－4.6mm
17-2
SUPER8 50 2T