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MSS Fly 50 4T
PIAGGIO MSS Fly 50 4T User Manual
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Air filter
• Unscrew the 7 cover screws and remove the
cover to reach the filter sponge.
• To disassemble the filter housing, unscrew the 2
bottom screws and disconnect the manifold con-
nections, the carburettor and the external air in-
take.
Rear mudguard
- Remove the side fairings
- Remove the 4 screws shown in the photograph
Chassis
MSS Fly 50 4T
CHAS - 144
143
145
Table of Contents
Index of Topics
5
Characteristics
6
Safety Rules
7
Maintenance Rules
7
Vehicle Identification
8
Dimensions and Mass
8
Engine
9
Transmission
10
Capacities
10
Electrical System
10
Frame and Suspensions
10
Wheels and Tyres
11
Secondary Air
11
Kehin
12
Tightening Torques
12
Front Brake
12
Front Suspension
12
Assembly Clearances
12
Cylinder - Piston Assy
13
Piston Rings
14
Crankcase - Crankshaft - Connecting Rod
15
Slot Packing System
15
Products
16
Tooling
17
Maintenance
26
Maintenance Chart
27
Carburettor
29
Checking the Spark Advance
30
Spark Plug
31
Hub Oil
32
Check
32
Replacement
32
Engine Oil
33
Air Filter
33
Engine Oil Filter
34
Checking the Ignition Timing
35
Checking the Valve Clearance
36
Headlight Adjustment
36
CO Check
37
SAS Filters Inspection and Cleaning
38
Troubleshooting
40
Poor Performance
41
Rear Wheel Spins at Idle
41
Starting Difficulties
41
Starting Problems
41
Excessive Oil Consumption/Exhaust Smoke
42
Insufficient Lubrication Pressure
42
Engine Tends to Cut-Off at Idle
42
Engine Tends to Cut out at Full Throttle
42
Excessive Exhaust Noise
43
High Fuel Consumption
43
SAS Malfunctions
43
Clutch Grabbing or Performing Inadequately
43
Insufficient Braking
44
Brakes Overheating
44
Battery
44
Turn Signal Lights Malfunction
44
Rear Wheel
45
Controls
45
Electrical System
46
Conceptual Diagrams
48
Ignition
48
Headlights and Automatic Starter Section
49
Battery Recharge and Starting
50
Level Indicators and Enable Signals Section
51
Turn Signal Lights
52
Checks and Inspections
52
Ignition Circuit
53
Stator Check
54
Voltage Regulator Check
54
Recharge System Voltage Check
55
Sealed Battery
57
Dry-Charge Battery
58
Engine from Vehicle
60
Exhaust Assy. Removal
61
Removal of the Engine from the Vehicle
61
Engine
62
Automatic Transmission
63
Transmission Cover
63
Kickstart
63
Air Duct
63
Removing the Driven Pulley Shaft Bearing
64
Refitting the Driven Pulley Shaft Bearing
64
Removing the Driven Pulley
64
Inspecting the Clutch Drum
65
Removing the Clutch
65
Inspecting the Clutch
66
Pin Retaining Collar
66
Removing the Driven Half-Pulley Bearing
67
Inspecting the Driven Fixed Half-Pulley
67
Inspecting the Driven Sliding Half-Pulley
68
Refitting the Driven Half-Pulley Bearing
68
Inspecting the Clutch Spring
69
Refitting the Clutch
69
Refitting the Driven Pulley
70
Drive-Belt
70
Removing the Driving Pulley
71
Refitting the Driving Pulley
72
Refitting the Transmission Cover
73
Removing the Hub Cover
74
Removing the Wheel Axle Bearings
74
Inspecting the Hub Shaft
76
Inspecting the Hub Cover
76
Refitting the Hub Bearings
77
Refitting the Ub Cover
77
Flywheel Cover
78
Cooling Hood
78
Cooling Fan
79
Removing the Stator
79
Refitting the Stator
79
Removing the Starter Motor
80
Removing the Flywheel Magneto
80
Inspecting the Flywheel Components
81
Starter Gear Rim
81
Intermediate Gear
81
Refitting the Flywheel Magneto
82
Refitting the Starter Motor
82
Removing the Rocker-Arms Cover
83
Removing the Timing System Drive
83
Removing the Cam Shaft
84
Removing the Cylinder Head
85
Removing the Valves
86
Removing the Cylinder - Piston Assy
86
Inspecting the Small End
87
Inspecting the Wrist Pin
87
Inspecting the Piston
87
Inspecting the Cylinder
88
Inspecting the Piston Rings
89
Removing the Piston
90
Choosing the Gasket
90
Refitting the Piston Rings
93
Refitting the Cylinder
94
Inspecting the Cylinder Head
94
Inspecting the Timing System Components
95
Inspecting the Valve Sealings
95
Inspecting the Valve Housings
96
Inspecting the Valves
97
Inspecting the Springs and Half-Cones
98
Refitting the Valves
98
Refitting the Head and Timing System Components
100
Refitting the Timing Chain
101
Refitting the Rocker-Arms Cover
103
Refitting the Intake Manifold
103
Crankcase - Crankshaft
103
Splitting the Crankcase Halves
104
Removing the Crankshaft Bearings
105
Refitting the Crankshaft Bearings
105
Inspecting the Crankshaft Alignment
106
Refitting the Crankcase Halves
107
Crankshaft Oil Seals
108
Refitting
108
Oil Pump
109
Removing the Oil Sump
112
Refitting the Oil Sump
112
Fuel Supply
112
Removing the Carburettor
113
Refitting the Carburettor
117
Level Check
119
Inspecting the Automatic Choke Device
120
Adjusting the Idle
122
Suspensions
125
Removing the Front Wheel
126
Front Wheel Hub Overhaul
126
Refitting the Front Wheel
127
Handlebar
128
Front Fork
128
Overhaul
128
Steering Column
130
Removing the Rear Wheel
131
Refitting the Rear Wheel
131
Shock Absorbers
131
Centre-Stand
132
Braking System
133
Front Brake Calliper
134
Front Brake Disc
136
Disc Inspection
137
Front Brake Pads
137
Fill
138
Front Brake Pump
139
Rear Drum Brake
140
Chassis
142
Removing the Ignition Key-Switch When on *Off*
143
Removing the Ignition Key-Switch When on *Lock*
143
Footrest
143
Air Filter
144
Rear Mudguard
144
Helmet Bay
145
Fuel Tank
145
Pre-Delivery
146
Aesthetic Inspection
147
Tightening Torques Inspection
147
Electrical System
147
Levels Check
148
Road Test
148
Static Test
149
Functional Inspection
149
Time
150
Engine
151
Crankcase
152
Crankshaft
152
Cylinder Assy
153
Cylinder Head Assy
154
Rocker Arms Support Assy
155
Cylinder Head Cover
156
Driven Pulley
157
Driving Pulley
159
Transmission Cover
160
Starter Motor
161
Flywheel Magneto
162
Carburettor
162
Exhaust Pipe
163
Air Cleaner
164
Frame
165
Legshield Spoiler
166
Rear Cover
167
Central Cover
168
Mudguard
169
Rear Shock-Absorber
171
Steering Column Bearings
172
Handlebar Covers
173
Handlebar Components
174
Swing-Arm
175
Seat
176
Turn Signal Lights
177
Front Wheel
178
Rear Wheel
179
Electric Devices
180
Electrical Devices
181
Electronic Controls
182
Transmissions
183
Brake Callipers
184
Steering Column
185
Helmet Bay
186
Rear Wheel Axle
187
Secondary Air Box
188
4
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PIAGGIO MSS Fly 50 4T Specifications
General
Brand
PIAGGIO
Model
MSS Fly 50 4T
Category
Scooter
Language
English
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