Yamaha F4B Service Manual page 29

TECH
FEA
Technical features and description
Engine control system ...................................................... 2-1
Outline ....................................................................................... 2-1
CDI unit ..................................................................................... 2-2
Ignition timing control ................................................................ 2-2
Ignition cut-off control ................................................................ 2-3
Power unit system ............................................................ 2-4
Outline ....................................................................................... 2-4
Automatic decompressor ........................................................... 2-5
Blowby gas reburning system ................................................... 2-6
Lighting coil (optional for European market) .............................. 2-7
Fuel system ....................................................................... 2-8
Outline ....................................................................................... 2-8
Carburetor ................................................................................. 2-9
Built-in primer pump ................................................................ 2-12
Lubrication system ......................................................... 2-13
Outline ..................................................................................... 2-13
Oil pump and engine oil flow ................................................... 2-13
Tilt system ....................................................................... 2-14
Outline ..................................................................................... 2-14
Reverse lock system ............................................................... 2-14
Lubrication diagram ........................................................ 2-15
Cooling flow diagram ...................................................... 2-16
Intake and exhaust flow diagram ................................... 2-17
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