Aprilia SR 50 servicemanual - Scootergrisen

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ENGINE 4.4. SECONDARY AIR SYSTEM 4.4.1. SECONDARY AIR SYSTEM SYSTEM DIAGRAM Key: 4 - 30 1. Intake manifold; 2. Secondary air valve; 3. From the engine; 4. Exhaust. SR 50
SR 50 SAS The Secondary Air System (SAS) has been developed to reduce carbon oxide and unburnt hydrocarbon emissions in vehicles that are not equipped with a lambda sensor. Natural air (which is rich in oxygen) is channelled into the exhaust stream to trigger a post-combustion process that raises the temperature of the exhaust gasses for a quick light-off of the catalyst. The secondary air system is especially useful when the engine is idling and during warm-up, since the catalyst alone is not capable of triggering post-combustion under these operating conditions. DESCRIPTION OF THE SYSTEM The secondary air system operates on pressure fluctuation in the exhaust system. During depression stages, the exhaust takes in oxygen-rich air from the secondary air system so unburnt gasses in the exhaust stream can complete the combustion. During overpressure stages, the secondary air reed valve cuts air supply to prevent backflow. On 4-stroke engines, the reed valve is equipped with a cutoff device that shuts down additional air during cut-off stages, as exceedingly lean exhaust gasses would lead to exhaust blowing, resulting in exhaust valve and catalytic converter damage. DETAILS OF SAS • The system consists of a rubber hose that takes filtered air in through a scoop on the casing. • Secondary air flow is controlled by a reed check valve, on the vehicle right-hand side, on the flywheel cover. • The secondary air tube is connected to a flanged metal fitting attached directly to the head exhaust duct. ENGINE 4- 31
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www.serviceaprilia.com 8140817 USA
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INTRODUCTION 0 - 2 SR 50 TABLE OF C
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INTRODUCTION 0.1.2. REFERENCE MANUA
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INTRODUCTION TEST = diagnostic chec
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GENERAL INFORMATION 1 - 2 SR 50 TAB
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GENERAL INFORMATION 1.1.2. SAFETY W
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GENERAL INFORMATION HYDROGEN GAS AN
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GENERAL INFORMATION 1.3. DANGEROUS
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GENERAL INFORMATION COOLANT 1 - 10
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GENERAL INFORMATION 1.5. VEHICLE ID
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3 4 5 6 GENERAL INFORMATION 1 - 14
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11 12 13 14 GENERAL INFORMATION 1 -
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SR 50 PERIODIC MAINTENANCE PERIODIC
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SR 50 2.1. SPECIFICATIONS 2.1.1. TE
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SR 50 2.1.2. SCHEDULED MAINTENANCE
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SR 50 2.1.4. TIGHTENING TORQUES PER
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SR 50 Description Q.ty Type of fast
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SR 50 2.1.5. MULTIFUNCTION DIGITAL
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SR 50 • CHRONOMETER sub-menu: thi
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SR 50 DELETE ERRORS: Select this fu
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SR 50 RESTORE CODE: If the user for
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SR 50 2.2. SCHEDULED MAINTENANCE 2.
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SR 50 CHECKING BRAKE PAD WEAR CAUTI
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SR 50 2.2.2. CLEANING THE AIR FILTE
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SR 50 • Start the vehicle and let
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SR 50 CHANGE • Position the vehic
Page 53 and 54: SR 50 • Unscrew and remove the fi
Page 55 and 56: SR 50 2.2.7. MIXER OIL IE50 TOPPING
Page 57 and 58: FUEL SYSTEM 3 - 2 TABLE OF CONTENTS
Page 59 and 60: FUEL SYSTEM 3.1.2. FUEL SUPPLY SYST
Page 61 and 62: FUEL SYSTEM • Loosen and remove t
Page 63 and 64: FUEL SYSTEM • Loosen and remove t
Page 65 and 66: FUEL SYSTEM 3.2. AIR FILTER 3.2.1.
Page 67 and 68: FUEL SYSTEM 3.2.2. REMOVING THE AIR
Page 69 and 70: FUEL SYSTEM 3.3.2. REMOVING THE THR
Page 71 and 72: FUEL SYSTEM 3.4. CARBURETOR 3.4.1.
Page 73 and 74: FUEL SYSTEM • Disconnect the auto
Page 75 and 76: SR 50 ENGINE ENGINE 4 4- 1
Page 77 and 78: SR 50 4.1. ENGINE IE 361 4.1.1. REM
Page 79 and 80: SR 50 • Remove the rubber plug.
Page 81 and 82: SR 50 • Working on the right side
Page 83 and 84: SR 50 • Connect the connector to
Page 85 and 86: SR 50 • Connect the generator con
Page 87 and 88: SR 50 4.2. ENGINE IE 50 4.2.1. REMO
Page 89 and 90: SR 50 • Disconnect the fuel injec
Page 91 and 92: SR 50 4.2.2. INSTALLING THE ENGINE
Page 93 and 94: SR 50 • Fit the spark plug cap.
Page 95 and 96: SR 50 4.3. ENGINE C 364 4.3.1. REMO
Page 97 and 98: SR 50 • Loosen and remove the two
Page 99 and 100: SR 50 • Working on the opposite s
Page 101 and 102: SR 50 • Connect the connector.
Page 103: SR 50 • Connect the temperature s
Page 107 and 108: SR 50 ENGINE 4- 33
Page 109 and 110: CYCLE PARTS 5 - 2 SR 50 TABLE OF CO
Page 111 and 112: CYCLE PARTS 5.1.2. REMOVING THE PAS
Page 113 and 114: CYCLE PARTS • Disconnect the tail
Page 115 and 116: CYCLE PARTS 5.1.5. REMOVING THE FRO
Page 117 and 118: CYCLE PARTS 5.1.7. REMOVING THE REA
Page 119 and 120: CYCLE PARTS 5.1.9. REMOVING THE INN
Page 121 and 122: CYCLE PARTS 5.1.10. REMOVING THE HE
Page 123 and 124: CYCLE PARTS 5.1.11. REMOVING THE FR
Page 125 and 126: CYCLE PARTS • Loosen and remove t
Page 127 and 128: CYCLE PARTS 5.2.2. REMOVING THE EXH
Page 129 and 130: CYCLE PARTS 5.3.2. REMOVING THE FRO
Page 131 and 132: CYCLE PARTS 5.4.2. REMOVING THE REA
Page 133 and 134: CYCLE PARTS • Remove the snap rin
Page 135 and 136: CYCLE PARTS 5.7. FRONT FORK 5.7.1.
Page 137 and 138: CYCLE PARTS 5.7.3. DISASSEMBLING TH
Page 139 and 140: SR 50 COOLING SYSTEM COOLING SYSTEM
Page 141 and 142: SR 50 6.1. COOLING SYSTEM 6.1.1. DI
Page 143 and 144: SR 50 ELECTRICAL SYSTEM ELECTRICAL
Page 145 and 146: SR 50 7.1. CHECKING THE ELECTRICAL
Page 147 and 148: SR 50 7 Fuel sensor: resistance acr
Page 149 and 150: SR 50 7.1.2. CHECKING THE COMPONENT
Page 151 and 152: SR 50 7 Fuel sensor: resistance acr
Page 153 and 154: SR 50 7.1.3. CHECKING THE COMPONENT
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SR 50 7 Headlight: low beam 12 V -
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SR 50 Key: 1. Multiple connectors 2
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Aprilia SR 50 servicemanual - Scootergrisen

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