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19. EXHAUST EMISSION CONTROL

SYSTEM

19-0

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EXHAUST EMISSION CONTROL SYSTEM

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SCHEMATIC DRAWING ............................................................ 19-1

EXHAUST EMISSION CONTROL SYSTEM FUNCTION............. 19-2

TROUBLESHOOTING ................................................................ 19-2

SERVICE INFORMATION .......................................................... 19-3

SECONDARY AIR CLEANER..................................................... 19-4

AIR INJECTION CUT-OFF VALVE (A.I.C.V.)............................. 19-5

REED VALVE ............................................................................ 19-6

Summary of content (7 pages)

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9.
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19.
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19. EXHAUST EMISSION CONTROL SYSTEM EXHAUST EMISSION CONTROL SYSTEM The exhaust emission control system adopted in this model utilizes the reed valve to draw secondary air into the exhaust system for re-combustion by means of exhaust pulsation so as to minimize the exhaust emission. FUNCTION Item Secondary Air Cleaner Purpose Filter secondary air. Prevent exhaust Air Injection Cut- muffler noise and off Valve backfiring at sudden deceleration.
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19. EXHAUST EMISSION CONTROL SYSTEM 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.
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19. EXHAUST EMISSION CONTROL SYSTEM Secondary Air Cleaner SECONDARY AIR CLEANER REMOVAL 1. Remove the front cover. (!2-4) 2. Disconnect the secondary air cleaner connecting tube. Remove the air cleaner attaching bolts and the air cleaner. Connecting Tube Bolt Cover Air Outlet Tube Screws DISASSEMBLY 1. Remove the two screws attaching the air cleaner cover to remove the cover. 2. Remove the air cleaner element. 3. Inspect the air cleaner. INSTALLATION 1.
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19. EXHAUST EMISSION CONTROL SYSTEM Air Injection Cut-off Valve AIR INJECTION CUT-OFF VALVE (A.I.C.V.) Vacuum Tube Bolt REMOVAL 1. Remove the front right side cover. (!2-4) 2. Disconnect all the tubes that go to the air injection cut-off valve. 3. Remove the air injection cut-off valve. Air Inlet Tube INSPECTION 1. Inspect the air injection cut-off valve flow using a vacuum pump. If the flow is not within the specified values, replace with a new one. 2.
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19. EXHAUST EMISSION CONTROL SYSTEM REED VALVE REMOVAL 1. Remove the frame center cover. 2. Remove the floor board. 3. Disconnect the secondary air inlet tube connector. 4. Remove the four cylinder head cover bolts and two secondary air outlet tube bolts. Secondary Air Inlet Tube Bolt Cylinder Head Cover Bolts Bolt INSPECTION 1. Remove the two bolts attaching the reed valve cover and the reed valve. 2. Check the reed valve for cracks, damage, big clearance or weak reeds. Replace if necessary. 3.